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          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC: Tokamak Core Assembly — spherical tokamak geometry selected over conventional aspect-ratio tokamak. Compact spherical design (aspect ratio ~1.8) enables higher plasma beta and smaller major radius (~3.6m) for equivalent fusion power, reducing magnet mass and building volume. Trade-off: tighter neutron shielding space on inboard side requires advanced shielding materials and imposes higher neutron flux on central column.">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="STEP programme selected spherical tokamak as the distinguishing technology pathway. Conventional tokamak (ITER-like A~3.1) requires 2x larger major radius for same power. Compact geometry proven by MAST-U and START experiments.">
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            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC: Magnet-Cryo boundary — Superconducting Magnet System and Cryogenic Plant are separate subsystems despite tight physical coupling. Magnets are bespoke HTS coils with unique structural/EM constraints; cryoplant is COTS industrial refrigeration. Different technology bases, procurement routes, and failure modes justify separation. Interface is cryogenic transfer lines and thermal budget.">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Trait profiles confirm: Magnet System (56D57018) is highly physical/structural while Cryogenic Plant (56D51218) differs in structural and active traits. Grouping would obscure fundamentally different engineering disciplines and supplier relationships.">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Analysis">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
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        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC-REQ-003">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC: Plasma Control System — separated from physical plant as a pure signal-processing/computing subsystem. Controls plasma position, disruption mitigation, and safety interlocks. Separation enables independent safety qualification (SIL 3 for safety functions) and technology refresh without physical plant modifications. Alternative of distributed control in each subsystem rejected: common mode awareness across all plasma parameters is essential for disruption prediction.">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Plasma control has the most distinct trait profile (55F77A18) — highest signal-processing and autonomy traits among all subsystems. Cross-domain analog: nuclear RPS Communication and Display Subsystem (54ED7859) follows same separation pattern.">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC: Power Conversion System — thermal power extraction and electrical generation grouped as single subsystem. Primary coolant loops, heat exchangers, steam cycle, and grid connection form a serial thermal chain with no natural break point. Alternative of separating blanket cooling from turbine island rejected: thermal-hydraulic transients propagate through the entire chain and must be managed holistically.">
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          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Thermal Power Extraction (40D53218) and Electrical Power Conversion (54F73A18) share the energy conversion mission. Separation would create an artificial interface boundary in the middle of the heat transport chain, complicating transient analysis.">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Analysis">
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          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC: Tritium Plant — self-contained subsystem with double-containment boundary. All tritium processing (exhaust, separation, storage, injection, detritiation) grouped within a dedicated building with independent ventilation and containment. Alternative of distributing tritium functions across subsystems rejected: single accountability for tritium inventory is a regulatory requirement (ONR, IAEA safeguards).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Tritium accountability to ±0.1g precision (STK-REQ-004) requires centralised inventory management. Distributed tritium handling would create multiple accountancy boundaries and increase regulatory complexity. ITER follows same pattern with dedicated Tritium Plant building.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Inspection">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC: Tokamak Core Assembly — five-component internal breakdown. First Wall and Blanket Module (tritium breeding, heat removal), Divertor Cassette Assembly (exhaust heat, neutral gas), Vacuum Vessel and In-Vessel Structures (vacuum boundary, neutron shielding), Plasma Heating and Current Drive System (NBI and ECRH auxiliary power), Diagnostics and Measurement Systems (plasma state feedback). This split follows ITER-proven maintenance zone boundaries: divertor cassettes and first-wall panels have different neutron damage lifetimes and require separate replacement campaigns through different port geometries. Integrated first-wall/divertor designs would force simultaneous replacement, increasing downtime.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="ITER experience and DEMO studies confirmed that separating the short-lifetime plasma-facing components (divertor, first wall) from the long-life structural vessel reduces scheduled maintenance time per campaign by enabling parallel removal paths. The NBI/ECRH split from the blanket isolates the high-power RF/beam systems that require different maintenance expertise and have different radiation dose constraints for maintenance access.">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Analysis">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="architecture; tokamak; session-509; idempotency:arc-tca-decomp-509">
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      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:ARC-REQ-007" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC-REQ-007">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC: Superconducting Magnet System — four-component topology: TF Coil Set provides steady-state toroidal field; CS provides ohmic induction; PF coils provide shaping; QDPS is a hardwired safety function. Power supply is electrically isolated from quench protection. This separation ensures QDPS can trip the supply independently of control system software, satisfying SIL-2 safety integrity without software-in-the-loop.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Separation of QDPS from MPSS is required by IEC 61511 SIL-2: quench protection must be independent of normal control functions. Integrated designs risk common-mode failure — ITER and JET post-quench analysis shows independent hardwired protection reduces hot-spot temperature exceedance by 3x.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Inspection">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="43">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="architecture; superconducting-magnet-system; session-511; idempotency:arc-sms-topology-511">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
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      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:ARC-REQ-008" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC-REQ-008">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC: Vacuum System — three-component topology separating pumping, measurement, and leak detection. Turbomolecular pumps provide raw pumping capacity; pressure monitoring provides plasma-control feedback and interlock; leak detection provides maintenance-phase diagnostics. Separation prevents false-trip from helium injection during leak testing triggering the pressure interlock.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ITER experience shows coupling leak detection helium directly to plasma interlocks causes false trips. Separating the three functions allows maintenance and commissioning activities without risk to plasma operations. Derived from ITER vacuum system lessons learned (ITER-D-4CA7HF).">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Inspection">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="architecture; vacuum-system; session-511; idempotency:arc-vs-topology-511">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
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      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:ARC-SUB-009" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC-REQ-009">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC: Cryogenic Plant — four-component decomposition separating refrigeration machinery (Helium Refrigeration System), distribution infrastructure (Cryogenic Transfer Line Network), gas inventory management (Helium Management System), and supervisory control (Cryogenic Control System). Refrigeration and transfer lines are physically distinct: the HRS cold boxes are fixed plant in the cryo hall while CTLN spans the building to the magnet ports. HMS is kept separate because quench gas recovery imposes surge-volume and purification requirements incompatible with steady-state refrigerator operation. CCS separation follows ITER/LHC precedent for independent safety qualification of cryo automation (SIL 2 quench response) without coupling to refrigerator control loops.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ITER cryogenic system architecture separates refrigerator, distribution, gas management, and control on the same basis. Coupling them would either under-constrain the control SIL or over-engineer the piping design. Trait profiles confirm: HRS (57D73218, Powered/Active/State-Transforming) vs CTLN (CE851018, Physical Object/Structural/passive) are ontologically distinct.">
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            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="architecture; cryogenic-plant; session-513; idempotency:arc-cryo-plant-513">
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      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:ARC-SUB-010" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC-REQ-010">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC: Remote Handling System — five-component decomposition separating manipulator (IVIMM), transfer cask, viewing system, tooling, and control suite. Manipulator and tooling are kept separate because radiation hardening, qualification, and replacement lifecycles differ: the IVIMM arm undergoes 10^6 Gy total dose and requires full replacement after ~3 campaign cycles, whereas tooling end-effectors are changed per task. Transfer cask isolation follows ITER design precedent: a dedicated shielded vessel prevents contamination spread during transport and allows hot-cell docking without vessel pressurisation. The viewing system is architecturally separate to allow independent camera feed validation without blocking manipulator command channels.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ITER and JET RH decompositions follow the same five-way split. Coupling IVIMM and control suite would preclude independent safety qualification: the IVIMM is a physical SIL-1 mechanical system; the control suite is a software SIL-1 system. Separate classification enables independent V&amp;V per IEC 62061.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Analysis">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="architecture; remote-handling-system; session-514; idempotency:arc-rhs-decomp-514">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:ARC-SUB-011" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC-REQ-011">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC: Power Conversion System — five-component decomposition separating steam generators, turbine-generator, condenser/cooling, feedwater/balance of plant, and grid interface. Steam generators are the nuclear/non-nuclear boundary: primary coolant circuit (radioactive tritiated water) is isolated by tube-and-shell boundary from secondary steam cycle. This isolation drives the split. Turbine-generator and feedwater systems are conventional power-station plant with no nuclear safety classification (SIL 0). Grid interface is kept separate because it carries the sole SIL 1 obligation in the PCS (overspeed protection driven by HV disconnection).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="PWR/BWR design convention: steam generator forms the nuclear/non-nuclear boundary. STEP secondary circuit is conventional; coupling it to the primary side in the decomposition would incorrectly elevate non-nuclear equipment to nuclear safety class. Separation also allows conventional utility grid codes to govern the grid interface without nuclear regulatory scope creep.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Analysis">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="architecture; power-conversion-system; session-514; idempotency:arc-pcs-decomp-514">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:IFC-REQ-001" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-001">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between Tokamak Core Assembly and Superconducting Magnet System SHALL provide magnetic field confinement with toroidal field 3-4T at plasma centre, field ripple &lt; 1%, and structural support for centering forces up to 100 MN, transmitted through the cryostat and gravity support structure.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Primary confinement interface: magnets surround the tokamak and generate the confining field. Forces are transmitted through structural supports that must accommodate thermal contraction from 300K to 4.5K. Field ripple affects plasma confinement quality and NTM stability.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; tokamak; magnet; session-506; idempotency:ifc-tca-sms-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:IFC-REQ-002" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-002">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between Cryogenic Plant and Superconducting Magnet System SHALL deliver helium coolant at 4.5 ± 0.1 K and 80 ± 2 K (thermal shields) via cryogenic transfer lines with total heat leak &lt; 5 W/m, supporting steady-state cooling capacity of 80 kW at 4.5 K.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Cryogenic transfer lines are the physical interface carrying liquid/supercritical helium from the cryoplant cold box to magnet cryostats. Temperature stability is critical for HTS performance; heat leak budget drives transfer line insulation design.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; cryogenic; magnet; session-506; idempotency:ifc-cry-sms-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:IFC-REQ-003" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-003">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between Tritium Plant and Tokamak Core Assembly SHALL transport fuel pellets (frozen D-T ice at ~18 K) at injection velocities 100-1000 m/s and extract divertor exhaust gas (D, T, He, impurities) at 10-100 Pa through the torus exhaust pumping duct.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Fuel injection and exhaust extraction are the mass flow interface between tritium processing and the plasma. Pellet velocity determines fuelling depth profile; exhaust pressure determines pumping speed requirements. All lines must maintain double tritium containment.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; tritium; tokamak; session-506; idempotency:ifc-trp-tca-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:IFC-REQ-004" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-004">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between Tokamak Core Assembly and Power Conversion System SHALL transfer thermal power via primary coolant (lithium-lead or helium at inlet/outlet temperatures of 300/500°C) through the breeding blanket and divertor cooling circuits, with total thermal capacity ≥ 500 MW.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This is the energy capture interface: neutrons and radiation deposit heat in blanket/divertor, primary coolant transports it to heat exchangers. Outlet temperature of 500°C drives Rankine cycle efficiency. Coolant choice (LiPb vs He) affects TBR and heat transfer coefficients.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; tokamak; power; session-506; idempotency:ifc-tca-pcs-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:IFC-REQ-005" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-005">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between Plasma Control System and Tokamak Core Assembly SHALL provide bidirectional data exchange: diagnostic signals from ≥ 40 sensor systems (magnetic, kinetic, spectroscopic) at ≥ 1 kHz to the controller, and actuator commands (gas valves, pellet injector, disruption mitigation) with end-to-end latency ≤ 1 ms.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Real-time plasma control requires high-bandwidth, low-latency acquisition of plasma state and deterministic actuation. 1 ms latency budget is driven by vertical stability growth rate of the spherical tokamak (~100 µs growth time requires ~1 kHz control bandwidth).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; control; tokamak; session-506; idempotency:ifc-plc-tca-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:IFC-REQ-006" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-006">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between Plasma Control System and Superconducting Magnet System SHALL command coil current changes via magnet power supplies with current regulation accuracy ≤ 0.1% and response time ≤ 10 ms for plasma position and shape control.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Plasma position/shape control drives coil currents via the PF/CS power supplies. 0.1% current accuracy maps to ~mm plasma position accuracy. 10 ms response time supports the 100 Hz outer control loop for shape maintenance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; control; magnet; session-506; idempotency:ifc-plc-sms-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:IFC-REQ-007" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-007">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between Vacuum System and Tokamak Core Assembly SHALL maintain base pressure &lt; 1×10⁻⁶ Pa in the plasma vessel via cryopumps with effective pumping speed ≥ 50 m³/s for deuterium, and handle helium ash exhaust during burn.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Vacuum quality directly affects plasma purity and performance. Pumping speed must exceed gas throughput from fuel injection, wall recycling, and helium ash production (~5% of D-T burn rate). Cryopumps are regenerated cyclically between pulses.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; vacuum; tokamak; session-506; idempotency:ifc-vac-tca-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:IFC-REQ-008" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-008">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between Remote Handling System and Tokamak Core Assembly SHALL provide maintenance access through horizontal (≥ 4) and vertical (≥ 2) ports with clear bore ≥ 1.5 m, supporting component transfer loads up to 10 tonnes per cassette.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Port size and number constrain the maintenance campaign duration and component design. 1.5 m bore allows divertor cassette extraction; 10 tonne limit drives manipulator and transfer cask structural design. Port locations must not compromise magnetic field quality.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; remote-handling; tokamak; session-506; idempotency:ifc-rhs-tca-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:IFC-REQ-009" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-009">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between Power Conversion System and National Electrical Grid SHALL export ≥ 100 MW at 400 kV, 50 Hz via the switchyard, with power factor ≥ 0.95, harmonic distortion &lt; 3% THD, and fault ride-through capability per Grid Code CC.6.3.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="External interface to National Grid ESO. Grid Code compliance is mandatory for connection. Fault ride-through prevents cascade disconnection during grid disturbances. Power factor and THD limits are standard Grid Code requirements for generation above 50 MW.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; external; power; grid; session-506; idempotency:ifc-pcs-grid-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-001" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-010">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Tritium Plant and Cryogenic Plant SHALL supply liquid nitrogen at 77 K +/- 2 K at a flow rate of 0.5 kg/s minimum to each cryogenic distillation column, with uninterrupted supply during all tritium processing modes.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Isotope separation by cryogenic distillation requires LN2 cooling at 77 K. Interruption stalls separation and risks tritium accumulating outside controlled process volumes. 0.5 kg/s per column derived from column heat duty at rated throughput 5 g T/day.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ifc-trp-cry-508">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-002" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-011">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Vacuum System and Tritium Plant SHALL transfer tritiated exhaust gas at throughput up to 200 Pa.m3/s from the divertor cryopumps to the Tritium Plant permeator inlet, with all interconnecting lines double-walled with secondary confinement and helium leak-test verified to less than 1e-9 Pa.m3/s.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Tritium-loaded exhaust from divertor pumping must be routed to the Tritium Plant for isotope recovery; direct venting would violate SYS-REQ-005 tritium containment. 200 Pa.m3/s is the peak exhaust load derived from helium ash production rate plus fuelling gas throughput at Q=5 burn.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ifc-vac-trp-508">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-004" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-012">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Plasma Control System and Vacuum System SHALL transmit divertor neutral gas pumping speed setpoints in the range 0 to 50 m3/s at update rate of 10 Hz with response latency of 500 ms or less, with continuous helium partial pressure feedback from the divertor region.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Divertor pumping speed controls helium ash exhaust and plasma purity. 50 m3/s maximum is derived from the divertor conductance at operating pressure; 10 Hz update rate and 500 ms latency are sufficient given the helium particle confinement time in the scrape-off layer of several seconds.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ifc-pcs-vac-508">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-003" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-013">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Plasma Control System and Tritium Plant SHALL transmit pellet fuel injection rate commands at update rate of 100 Hz or higher with command latency of 100 ms or less, over a safety-rated control network with status feedback from the pellet injector confirming execution within 200 ms.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Real-time fuelling control is required to maintain D-T fuel mix and plasma density for Q &gt;= 5 burn. 100 Hz update rate and 100 ms latency are derived from the plasma particle confinement time (~300 ms) requiring density corrections at least 3 times per confinement time.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ifc-pcs-trp-508">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-005" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-014">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Power Conversion System coil power supplies and Superconducting Magnet System SHALL deliver DC current to each TF, PF, and CS coil group at up to 80 kA with current stability of 0.01 percent peak-to-peak and current ramp rate up to 10 kA/s, with independent quench detection interlock per coil group.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="TF coil current stability of 0.01% maps to field ripple stability meeting the IFC-REQ-001 limit of 0.5%. Ramp rate of 10 kA/s is set by the maximum allowable eddy-current heat deposition in the cryostat during CS pre-magnetisation, derived from the thermal budget per pulse cycle.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="rt-resolved-session-531">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-007" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-015">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Remote Handling System and Tritium Plant SHALL ensure all remote handling tools operating inside the tritium secondary containment boundary are decontaminable to a surface tritium activity of 1 Bq/cm2 or less, with all tool wetted surfaces constructed from tritium-compatible materials (stainless steel 316L or approved equivalent) rated for 10 year service life.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Tool decontaminability is required for personnel safety when tools are withdrawn from the tritium boundary. 1 Bq/cm2 is the regulatory limit for unrestricted material transfer under ONR guidance. 316L SS is the baseline tritium-compatible material per ITER material qualification programme.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Inspection">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="rt-resolved-session-531">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-006" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-016">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Cryogenic Plant and Vacuum System SHALL supply 4.5 K cold heads to up to 20 vacuum cryopump bodies at a total heat load of 5 W per cryopump, with cold head temperature stability of 0.2 K and helium boil-off gas from regenerating cryopumps returned to the Cryogenic Plant gas recovery system.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Vacuum cryopumps on the divertor and torus use helium cold heads at 4.5 K to maintain pumping speed &gt; 50 m3/s for SYS-REQ-008. 5 W per cryopump is from the manufacturer heat load specification. Gas recovery prevents helium loss and maintains cryoplant efficiency.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ifc-cry-vac-508">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-009" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-017">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Plasma Control System and Remote Handling System SHALL provide hardwired interlock signals preventing plasma ignition or magnet energisation during remote maintenance operations, with interlock bypass requiring two-key authorisation and a positive confirmation from the Remote Handling System controller before restoration.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Personnel safety during maintenance campaigns requires hardware interlocks preventing inadvertent plasma or magnet activation when RHS tools are inside the machine. The two-key mechanism provides defence-in-depth per SIL-3 requirements for safety-critical interlocks; software-only interlocks are insufficient for ONR licensing.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ifc-pcs-rhs-interlock-508">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-008" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-018">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Power Conversion System and Tokamak Core Assembly SHALL supply auxiliary AC electrical power at 33 kV, 11 kV, and 415 V plant buses to Tokamak Core Assembly services including in-vessel diagnostics, auxiliary heating bus bars, blanket coolant pump drives, and radiation monitoring, with availability of 99.9 percent or better during plasma operations.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="TCA requires continuous auxiliary power for diagnostics (SYS-REQ-013), active cooling, and safety-classified loads. 99.9% availability is derived from allowable plasma interruption frequency: more than 1 unplanned outage per 1000 hours would prevent achieving SYS-REQ-010 operational availability of 50%.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ifc-pcs-tca-aux-508">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-010" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-019">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the National Electrical Grid and Power Conversion System for station loads SHALL import auxiliary power at 33 kV from the grid to maintain station essential services during pre-ignition start-up and maintenance periods at loads up to 50 MW, with automatic transfer to on-site diesel generation within 10 seconds of grid loss.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STEP requires grid power during start-up before the plant is generating. The 50 MW station load is the total auxiliary demand including cryoplant compressors, tritium plant, and HVAC. 10 s diesel transfer time is set by the critical load hold-up time for uninterruptible supply systems.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="rt-resolved-session-531">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-011" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-020">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Tokamak Core Assembly and Cryogenic Plant for vessel bake-out SHALL supply hot nitrogen gas at 200°C ± 5°C and ≥ 5 bar gauge at a mass flow rate of ≥ 2 kg/s to the first wall in-vessel bake-out circuit to achieve 200°C wall temperature within 24 hours of bake initiation, with thermal gradient to superconducting magnet cryostats limited to ≤ 5 K/hr.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="In-vessel bake-out at 200°C is required to drive out water and hydrocarbon impurities that would compromise vacuum base pressure. The 2 kg/s nitrogen flow rate is derived from in-vessel first wall surface area (~500 m²), heat capacity of tungsten-armoured steel panels, and the 24-hour thermal soak target. The 5 K/hr thermal gradient limit to magnet cryostats is the manufacturer's constraint to avoid thermal fatigue cracking of the cold-warm transition components. Original text used 'sufficient' (non-measurable); revised to 2 kg/s specific value in validation session 519.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="71">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ifc-tca-cry-bakeout-508">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:IFC-REQ-021" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-021">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Tritium Plant Plasma Exhaust Processing System and the Isotope Separation System SHALL transfer purified hydrogen isotopologue stream at pressures between 1 kPa and 100 kPa, with helium content below 100 ppm and water vapour below 1 ppm, via a double-wall tritium-tight transfer line.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="These purity and pressure specifications are the input requirements for the ISS cryogenic distillation columns. Helium above 100 ppm would freeze out in the columns and cause blockage; water above 1 ppm poisons the Pd membrane catalysts. Double-wall transfer line is required by the tritium double-containment principle. Interface derives from IFC-REQ-011 (external vacuum-tritium plant boundary).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; tritium-plant; sil-3; session-510; idempotency:ifc-trp-peps-iss-510">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:IFC-REQ-022" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-022">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Tritium Plant Isotope Separation System and the Tritium Storage and Delivery System SHALL transfer DT product at purity greater than 99.9% hydrogen isotopes via a metal hydride buffer vessel, with batch transfer latency not exceeding 15 minutes and transfer rate up to 5 g tritium equivalent per hour.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="15-minute batch transfer latency and 5 g/h transfer rate maintain the fuel cycle inventory balance without creating large transient tritium accumulations in transfer lines. The buffer vessel decouples the distillation column cycle time from the storage refill demand. Derives from IFC-REQ-013 (PCS pellet injection command interface) which requires fuel on demand within the fueling system response time.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; tritium-plant; sil-3; session-510; idempotency:ifc-trp-iss-tsds-510">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:IFC-REQ-023" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-023">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Tritium Plant Blanket Tritium Extraction System and the Isotope Separation System SHALL transfer extracted tritium-in-helium at a concentration of 0.1 to 1% tritium by volume, at flow rates between 1 and 10 standard litres per minute, through a dedicated permeator and compressor stage.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Blanket purge gas arrives at ~0.1-1% tritium concentration after permeation extraction from the breeding pebbles. A dedicated feed compressor and permeator stage is required because the BTES output pressure and purity differ significantly from the PEPS exhaust stream, preventing direct commingling which would upset the ISS distillation balance. Derives from SYS-REQ-003 (TBR closure) and the blanket tritium extraction architecture decision.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; tritium-plant; sil-2; session-510; idempotency:ifc-trp-btes-iss-510">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:IFC-REQ-024" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-024">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Superconducting Magnet System Quench Detection and Protection System and the Magnet Power Supply System SHALL transmit a hardwired quench interlock signal within 1 ms of quench detection, causing the Power Supply System to open all coil current loops and connect dump resistors.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="1 ms hardwired path is required because the 50 ms total dump initiation budget (from SUB-REQ-023) must accommodate 10 ms detection, signal transmission, and power electronics switching. Software-routed signals add latency that would exceed this budget. Derives from SUB-REQ-023 and the SYS-REQ-006 quench management requirement.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; superconducting-magnet-system; sil-2; session-510; idempotency:ifc-sms-qdps-mps-510">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:IFC-REQ-025" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-025">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Magnet Power Supply System and the TF Coil Set SHALL provide a DC bus voltage of up to 30 kV and a peak current of 80 kA, with a current measurement accuracy of better than 0.01% full scale provided by a Rogowski coil transducer, transmitted to the Plasma Control System via IEC 61850 GOOSE messaging at 1 kHz.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="80 kA at 30 kV derived from TF coil inductance and target 2-hour ramp-up. 0.01% current accuracy is required to meet the 10 ppm field ripple in SUB-REQ-026 — coil current is the dominant field error source. IEC 61850 GOOSE selected for deterministic sub-ms latency required by plasma control.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; superconducting-magnet-system; session-511; idempotency:ifc-mpss-tf-power-511">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:IFC-REQ-026" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-026">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Quench Detection and Protection System and the TF Coil Set SHALL monitor the voltage across each superconducting coil pancake via galvanically isolated voltage taps with a measurement bandwidth of at least 1 kHz and an input impedance of greater than 1 MΩ to prevent current diversion.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="1 kHz measurement bandwidth is required to detect the resistive voltage transient within the 10 ms window of SUB-REQ-023. High input impedance prevents voltage tap leads from acting as a current bypass path in the coil, which could mask the resistive signature and delay quench detection.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; superconducting-magnet-system; session-511; idempotency:ifc-qdps-tf-voltages-511">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:IFC-REQ-027" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-027">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Vacuum System Pressure Monitoring System and the Plasma Control System SHALL transmit digitised vessel pressure readings from all active gauges at a rate of 10 Hz per gauge over a dedicated Ethernet link (1 Gbit/s), with end-to-end latency not exceeding 50 ms, and SHALL transmit hardwired analogue interlock signals on a dedicated 24 V DC loop for pressure threshold exceedance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="10 Hz update rate matches the PCS plasma control bandwidth. Hardwired analogue interlock loop is required because the 200 ms SIL-2 interlock requirement in SUB-REQ-030 cannot be guaranteed over a shared digital network — dedicated hardwired signal ensures deterministic delivery independent of Ethernet congestion.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; vacuum-system; session-511; idempotency:ifc-vs-pressure-pcs-511">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:IFC-REQ-028" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-028">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Helium Refrigeration System and the Cryogenic Transfer Line Network SHALL supply supercritical helium at 4.5 K ± 0.2 K and 3 bar ± 0.1 bar with a flow rate of 40 g/s per train through DN50 vacuum-jacketed bayonet couplings rated to 20 bar.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Magnet cryostat inlet conditions require 4.5K ± 0.2K to maintain HTS coil superconductivity with adequate margin to Tcs. 3 bar supply pressure is the minimum to overcome transfer line pressure drop over 200m run. DN50 bayonet couplings are the IEA standard for fusion-scale cryoplant interfaces.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; cryogenic-plant; session-513; idempotency:ifc-hrs-ctln-513">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:IFC-REQ-029" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-029">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Cryogenic Control System and the Helium Refrigeration System SHALL transmit cold box setpoints, valve commands, and alarm acknowledgements over a redundant Profibus DP or equivalent fieldbus at ≤ 100 ms scan cycle, with hardwired emergency stop signals independent of the fieldbus.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="100ms scan cycle supports the cool-down rate control loop bandwidth (minimum 1Hz required for 5K/hr gradient control). Hardwired e-stop independence is an IEC 61508 SIL 2 requirement — safety functions must not depend on network communication paths that can fail silently.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; cryogenic-plant; session-513; idempotency:ifc-ccs-hrs-513">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:IFC-REQ-030" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-030">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Helium Management System and the Helium Refrigeration System SHALL supply helium gas at 200 bar ± 5 bar and ≥ 99.999% purity through DN25 high-pressure connections at a maximum flow rate of ≥ 25 Nm³/hr, enabling refill of a 1,250 NL helium buffer from 50% to 100% capacity within ≤ 4 hours.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Post-quench recovery requires repressurising the 4.5 K helium circuit from residual gas recovered during venting. 1,250 NL buffer at 200 bar stores the equivalent of 5,000 L dewar capacity as specified in the original requirement; 25 Nm³/hr flow rate gives 1,250/25 = 50 hours to fill from empty, but the 50%-to-100% case is 625 NL / 25 Nm³/hr = 25 hours; to achieve the ≤4 hour target from 50%, the flow rate must be ≥ 625/4 = 156 NL/hr = 0.156 Nm³/hr. However the 200-bar compression of 1,250 L standard requires 6.25 Nm³; at ≥25 Nm³/hr, fill time is ≤15 min; value chosen to match post-quench recovery logistics. Removed 'sufficient' ambiguity; quantified as ≥25 Nm³/hr. Revised in validation session 519.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="71">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; cryogenic-plant; session-513; idempotency:ifc-hms-hrs-513">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:IFC-REQ-031" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-031">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the In-Vessel Inspection and Maintenance Manipulator and the Remote Handling Control Suite SHALL use a real-time motion control protocol (EtherCAT or equivalent) with command cycle time ≤ 4 ms and position feedback latency ≤ 8 ms under full-motion conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Human-in-the-loop teleoperation at 1 mm positioning accuracy requires the control loop bandwidth to exceed 125 Hz (1/8ms). Below this rate, operator perception delay causes instability in fine positioning. EtherCAT is radiation-tolerant at standoff distances (electronics in remote handling control room, fibre-optic link into vessel) and is the ITER RH standard.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; remote-handling-system; sil-1; session-514; idempotency:ifc-ivimm-rhcs-514">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:IFC-REQ-032" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-032">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Remote Handling Transfer Cask and the tokamak vessel port SHALL provide a contamination-free docking connection with helium leak rate &lt; 1×10^-9 Pa·m³/s when mated, and shall not impose structural loading exceeding 5 kN vertical force on the vessel port flange.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Tritium contamination of the cask transfer corridor is the primary consequence of a failed port-cask docking. The 10^-9 Pa·m³/s leak rate is the same standard as the primary vessel boundary (SYS-REQ-008 basis). The 5 kN structural limit is derived from vessel port flange thermal stress budget, which already consumes 15 kN of the 20 kN port load allowance from magnetic forces.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="rt-resolved-session-531">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:IFC-REQ-033" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-033">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the In-Vessel Viewing and Monitoring System and the Remote Handling Control Suite SHALL deliver stereo video at ≥ 25 fps, ≥ 1080p resolution, with end-to-end latency &lt; 200 ms from scene capture to operator display.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Human spatial perception for teleoperated fine manipulation requires stereo video at ≥ 25 fps to avoid judder during fine operations. 200 ms total latency is the accepted human-factors limit for teleoperation before manual stability degrades (ESA Human-Factors in Teleoperation, ECSS-E-HB-11A). Higher latency causes overcorrection oscillations at &lt;1 mm positioning.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; remote-handling-system; sil-1; session-514; idempotency:ifc-ivvs-rhcs-514">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:IFC-REQ-034" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-034">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Steam Generator and Heat Transfer System primary side and secondary side SHALL maintain tube-to-shell differential pressure capability ≥ 20 MPa at 350°C, with tube leak rate &lt; 1×10^-6 Pa·m³/s per tube as a prerequisite for steam generator commissioning.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Primary coolant pressure is 15 MPa; secondary steam pressure is 16 MPa. The 20 MPa differential capability provides 25% safety margin over the primary pressure and matches the steam generator design pressure class. The 10^-6 leak rate limit ensures primary tritiated water cannot contaminate the secondary steam cycle, which is the key radioactive release pathway per STEP fault tree FT-PCS-001.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; power-conversion-system; sil-1; session-514; idempotency:ifc-sg-primary-secondary-514">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:IFC-REQ-035" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-035">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Turbine-Generator Set and the Grid Interface and Electrical Switchgear SHALL transmit electrical power at ≥ 120 MVA at 22 kV ± 2.5%, power factor 0.85–1.0 lagging, with generator step-up transformer losses &lt; 0.5% of rated MVA.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The 120 MVA rating provides headroom above the 100 MW net target after auxiliary loads. The 22 kV generator terminal voltage is the standard for generators of this rating class (IEC 60034-1). Transformer losses &lt;0.5% are the IEC 60076-1 Category AA+ efficiency requirement, achievable with modern grain-oriented silicon steel core design. Higher losses reduce net export below the 100 MW requirement.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="rt-resolved-session-531">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:IFC-REQ-036" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-036">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Power Conversion System and the Plasma Control System SHALL receive plasma disruption notification within ≤ 100 ms of disruption onset, transmitted over a dedicated hardwired interlock signal (not network-dependent), to initiate controlled turbine runback.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Turbine runback must begin within 100 ms of disruption onset to complete the 60-second runback sequence before thermal transients from loss of plasma heating cascade to condenser pressure spikes. Network-dependent signalling introduces unacceptable latency jitter (~100–500 ms on SCADA); hardwired relay ensures deterministic &lt;100 ms delivery per IEC 61508 Part 2 architectural constraint for safety instrumented systems.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; power-conversion-system; sil-1; session-514; idempotency:ifc-pcs-pcs-disruption-514">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:STK-REQ-001" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-001">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL provide the control room operator with real-time plasma state displays updating at ≥10 Hz, including plasma current, stored energy, density, and MHD stability indicators.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Control Room Operator, S-001 Full-Power Burn: operators must continuously monitor plasma parameters during 6-hour burn pulses to detect instabilities and decide on intervention timing.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="stakeholder; stk-operator; session-506; idempotency:stk-operator-display-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:STK-REQ-002" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-002">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL enable operator-initiated emergency plasma termination within 2 operator actions and ≤5 seconds from decision to actuation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="test update">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="stakeholder; stk-operator; session-506; idempotency:stk-operator-emergency-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:STK-REQ-003" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-003">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL demonstrate a deterministic nuclear safety case compliant with ONR Safety Assessment Principles, including fault analysis for all Design Basis Accidents with consequences below ONR Basic Safety Levels.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Nuclear Safety Regulator (ONR), all scenarios: ONR must license the first fusion nuclear facility; the safety case must meet established nuclear standards adapted for fusion-specific hazards.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Analysis">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="stakeholder; stk-onr; session-506; idempotency:stk-onr-safetycase-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:STK-REQ-004" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-004">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL maintain tritium inventory accountability to ±0.1 g precision and provide real-time tritium balance reporting to the regulator.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Nuclear Safety Regulator (ONR), S-003 Tritium Processing Malfunction: tritium is the principal nuclear material; loss-of-accountability triggers regulatory escalation and potential licence conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="stakeholder; stk-onr; session-506; idempotency:stk-onr-tritium-accountability-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:STK-REQ-005" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-005">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL provide remote handling capability to replace all in-vessel components (divertor cassettes, blanket modules, diagnostics) without human entry to activated areas.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Remote Handling Engineer, S-005 Planned Maintenance: in-vessel dose rates exceed 10 Sv/hr post-operation, making human entry impossible; all maintenance must be robotic with hot cell support.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="stakeholder; stk-remote-handling; session-506; idempotency:stk-rh-capability-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:STK-REQ-006" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-006">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL complete a full divertor cassette replacement campaign (8 cassettes) within 4 months using remote handling systems.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Remote Handling Engineer, S-005 Planned Maintenance: 4-month maintenance campaign target drives plant availability to 50%; exceeding this timeline directly reduces energy output and economic viability.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="stakeholder; stk-remote-handling; session-506; idempotency:stk-rh-campaign-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:STK-REQ-007" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-007">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL operate a closed tritium fuel cycle with breeding ratio TBR ≥ 1.1, processing exhaust gas to recover unburned tritium within 4 hours of extraction.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Tritium Plant Operator, S-001 Full-Power Burn: tritium self-sufficiency is a fundamental mission requirement; external tritium supply is limited and expensive, so breeding and recycling must close the loop.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="stakeholder; stk-tritium-operator; session-506; idempotency:stk-tritium-fuelcycle-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:STK-REQ-008" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-008">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="When a tritium system leak is detected, the STEP Fusion Power Plant SHALL automatically isolate the affected line within 30 seconds and activate secondary containment.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Tritium Plant Operator, S-003 Tritium Processing Malfunction: automatic isolation prevents inventory loss and environmental release; 30s threshold limits release to &lt;0.1 g per scenario analysis.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="stakeholder; stk-tritium-operator; session-506; idempotency:stk-tritium-isolation-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:STK-REQ-009" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-009">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL deliver net electrical power of ≥100 MW to the 400 kV grid connection point during steady-state burn, compliant with National Grid ESO Grid Code for frequency response and voltage regulation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Grid Transmission Operator (National Grid ESO), S-001 Full-Power Burn: the fundamental mission of STEP is to demonstrate net electricity generation; Grid Code compliance is mandatory for grid connection.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="stakeholder; stk-grid-operator; session-506; idempotency:stk-grid-power-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:STK-REQ-010" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-010">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL provide 24-hour advance notification to National Grid ESO of planned pulse schedules and ≥15 minutes warning of unplanned shutdowns.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Grid Transmission Operator (National Grid ESO), S-001/S-004: pulsed power profile requires grid scheduling; unplanned loss of 100 MW generation affects grid stability.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="stakeholder; stk-grid-operator; session-506; idempotency:stk-grid-notification-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:STK-REQ-011" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-011">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL maintain individual worker radiation doses below 20 mSv/year with an ALARP target of &lt;1 mSv/year, through shielding, remote operations, and access controls.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Radiation Protection Adviser, S-005/S-004: IRR17 dose limits and ALARP principle are non-negotiable regulatory requirements; 14.1 MeV neutron environment and activation make dose management critical.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Analysis">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="stakeholder; stk-rpa; session-506; idempotency:stk-rpa-dose-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:STK-REQ-012" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-012">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL classify all areas by radiation zone and enforce interlocked access controls preventing entry to zones exceeding the worker's authorised dose rate.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Radiation Protection Adviser, S-005 Planned Maintenance: maintenance campaigns involve variable dose rates across the facility; automated zoning prevents inadvertent exposure during complex multi-team operations.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Inspection">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="stakeholder; stk-rpa; session-506; idempotency:stk-rpa-zoning-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:STK-REQ-013" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-013">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL limit all radioactive discharges (gaseous and liquid) to levels below Environmental Permitting Regulations limits, with continuous stack and effluent monitoring.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Environment Agency: EPR compliance is a condition of operation; continuous monitoring provides the evidence base for the environmental safety case and public dose assessment.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="stakeholder; stk-environment-agency; session-506; idempotency:stk-ea-discharges-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:STK-REQ-014" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-014">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL categorise all radioactive waste at source and provide interim storage for ILW with a 100-year design life pending national disposal facility availability.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Environment Agency: no UK geological disposal facility exists yet for ILW; the plant must demonstrate a credible waste strategy with long-duration interim storage to obtain environmental permits.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Inspection">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="stakeholder; stk-environment-agency; session-506; idempotency:stk-ea-waste-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:STK-REQ-015" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-015">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL maintain off-site radiation doses below 1 mSv/year to any member of the public, including contributions from routine discharges, direct radiation, and accident scenarios.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Local Community and Public: public dose limit under IRR17; community acceptance depends on demonstrating that fusion is radiologically safe under all conditions including accidents.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Analysis">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="stakeholder; stk-public; session-506; idempotency:stk-public-dose-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:STK-REQ-016" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-016">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL implement an emergency planning zone with public notification capability achieving ≥95% population coverage within 15 minutes of a declared nuclear emergency.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Local Community and Public, S-003/S-004: REPPIR regulations require off-site emergency planning; rapid notification is essential for public protection during tritium release or seismic events.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="stakeholder; stk-public; session-506; idempotency:stk-public-emergency-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:STK-REQ-017" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-017">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL provide comprehensive plasma physics diagnostic data (≥40 diagnostic systems) with calibrated, time-synchronised output available to the fusion research community within 30 days of each campaign.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Fusion Research Community (UKAEA, EUROfusion): STEP's dual mission includes advancing fusion science; diagnostic data validates physics models and informs DEMO/commercial reactor design.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="stakeholder; stk-research; session-506; idempotency:stk-research-diagnostics-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:STK-REQ-018" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-018">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL validate tritium breeding blanket performance through in-situ measurement of tritium production rates, neutron spectra, and thermal-hydraulic conditions in breeding modules.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Fusion Research Community (UKAEA, EUROfusion), S-001: breeding blanket validation is a key STEP mission deliverable; no prior device has operated a breeding blanket in a DT neutron environment at reactor scale.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="stakeholder; stk-research; session-506; idempotency:stk-research-blanket-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:STK-REQ-019" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-019">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL be designed for decommissioning with all components classifiable under UK radioactive waste categories, and a demonstrated dismantling sequence achievable within 30 years of final shutdown.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Decommissioning Authority: NDA and ONR require a credible decommissioning strategy at the design stage; 30-year timeline aligns with UK nuclear decommissioning practice and funding models.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Analysis">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="stakeholder; stk-decommissioning; session-506; idempotency:stk-decom-timeline-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:STK-REQ-020" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-020">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL minimise activation of structural materials through material selection (reduced-activation steels, tungsten, SiC composites) such that ≥80% of decommissioning waste is classifiable as LLW within 100 years.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Decommissioning Authority: minimising ILW reduces long-term storage burden and cost; material choice at design stage is the primary lever for waste classification outcomes.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Analysis">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="stakeholder; stk-decommissioning; session-506; idempotency:stk-decom-materials-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-001" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-001">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Plasma Control System SHALL execute the plasma position and shape control algorithm with a cycle time of 1 ms or less, processing all diagnostic inputs and issuing actuator commands within a single deterministic RTOS cycle.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Derived from IFC-REQ-005 (1 ms end-to-end latency) and SYS-REQ-004 (disruption mitigation within 10 ms). The 1 ms control cycle provides 10 samples before the 10 ms mitigation deadline and maintains the PID bandwidth needed for ELM suppression and NTM stabilisation at Q&gt;=5 burn conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; plasma-control; session-507; sil-3; idempotency:sub-pcs-rttiming-507">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-002" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-002">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Plasma Control System SHALL detect plasma disruption precursors (locked mode amplitude exceeding 5 mT, beta collapse rate exceeding 10%/ms, or n=1 Mirnov signal exceeding threshold) and trigger massive material injection within 10 ms of threshold crossing, with a probability of detection of 0.99 or greater across the full disruption database.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Directly derives from SYS-REQ-004 (disruption mitigation within 10 ms) and hazard H-001 (plasma disruption, SIL-3). The 10 ms window is set by the thermal quench timescale: first-wall energy density exceeds design limits if mitigation fires later. 0.99 detection probability is the minimum consistent with SIL-3 unavailability budget of 10^-3.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; plasma-control; session-507; sil-3; idempotency:sub-pcs-disruption-507">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-003" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-003">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Plasma Control System SHALL implement dual-redundant Real-Time Plasma Controllers executing identical algorithms in lockstep, with automatic switchover to the standby controller within 500 ms of a primary controller fault, without loss of plasma confinement.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Updated in validation session 530: SIL-3 dual-redundancy requirement for RTPC must use Test verification per IEC 61508. VER-REQ-016 specifies the hardware failover injection test. The earlier Demonstration designation was insufficient for SIL-3 — Test is mandatory where Analysis alone cannot validate the actual switchover latency and state-preservation under realistic fault conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; plasma-control; session-507; sil-3; idempotency:sub-pcs-redundancy-507">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-004" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-004">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Plasma Control System Diagnostic Data Acquisition Front-End SHALL sample all 40 or more plasma diagnostic channels at a minimum rate of 1 kHz with hardware-timestamped synchronisation accuracy of 1 microsecond or better across all channels.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Derived from IFC-REQ-005 (40+ diagnostics at 1 kHz). Synchronisation accuracy of 1 microsecond is required to correctly correlate spatially distributed magnetic and kinetic measurements for equilibrium reconstruction: timing error above 1 ms introduces position errors of order 10 cm in the reconstructed plasma boundary, exceeding the control tolerance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; plasma-control; session-507; sil-3; idempotency:sub-pcs-daq-507">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-005" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-005">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="When the Plasma Control System detects an internal fault (controller failure, loss of diagnostic data, or watchdog timeout), the Plasma Control System SHALL initiate a controlled plasma shutdown by commanding gas injection to terminate plasma current within 30 seconds, before transitioning to a passive safe state.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Updated in validation session 530: SIL-3 PCS internal fault response must use Test verification per IEC 61508. VER-REQ-012 specifies the fault injection test covering watchdog timeout, data loss, and sensor failure modes. Demonstration was initially specified but Test is required for SIL-3 safety functions to capture actual PLC failover behaviour under production hardware fault conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; plasma-control; session-507; sil-3; idempotency:sub-pcs-safestate-507">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-006" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-006">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="When a disruption current quench is detected, the Plasma Control System Disruption Prediction and Mitigation Unit SHALL trigger massive material injection to achieve runaway electron seed density suppression, delivering a minimum of 10 to the power 22 hydrogenic atoms into the plasma within 50 ms of current quench onset.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Hazard H-006 (runaway electron beam, SIL-3): relativistic electrons above 10 MeV can perforate the first wall. Material injection at the required density provides collisional scattering to suppress runaway seed population before amplification. 50 ms is set by the runaway growth time at post-disruption conditions; 10^22 atoms is derived from the required electron mean free path reduction.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; plasma-control; session-507; sil-3; idempotency:sub-pcs-runaway-507">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-012" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-007">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Tokamak Core Assembly first wall and divertor SHALL withstand steady-state peak heat flux of 10 MW/m2 on the divertor strike zones and 0.5 MW/m2 on the first wall during nominal Q=5 burn, with tungsten armour net erosion rate less than 1 mm per full-power year averaged across all plasma-facing surfaces.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Derived from SYS-REQ-001 (Q&gt;=5 burn for 2-8 hours) and SYS-REQ-004 (first-wall thermal load limit). 10 MW/m2 divertor heat flux is the design point from SOLPS-ITER edge transport modelling at STEP power levels; 1 mm/year erosion limit is set by the maintenance campaign cycle: more rapid erosion would require unscheduled divertor replacement before the 4-month campaign, violating SYS-REQ-009.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-tca-heatflux-508">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-013" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-008">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Superconducting Magnet System TF coil set SHALL generate a toroidal magnetic field of 3.0 T or greater on the plasma magnetic axis, with field ripple delta-B/B of 0.5 percent or less at the last closed flux surface, during steady-state plasma operation, and SHALL detect a quench in any coil within 100 ms of quench initiation and initiate energy extraction to external dump resistors within a further 200 ms.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="3.0 T on-axis is the minimum field for Q&gt;=5 burn at the STEP aspect ratio per MHD stability analysis (SYS-REQ-001). 0.5% field ripple is the maximum compatible with neoclassical transport at the design plasma beta; higher ripple causes ion orbit losses that reduce Q. 100 ms quench detection and 200 ms extraction initiation are derived from the adiabatic hot-spot temperature limit of 300 K (SYS-REQ-006): slower response would cause quench propagation and conductor damage.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-sms-field-quench-508">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-014" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-009">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Cryogenic Plant SHALL maintain superconducting magnet cryostats at 4.5 K or below with temperature stability of plus or minus 0.1 K during steady-state magnet excitation, providing minimum refrigeration capacity of 15 kW at 4.5 K from at least two independent cold box trains such that loss of any single cold box does not prevent continuation of plasma operations at reduced pulse duration.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="4.5 K is the upper operating temperature for the selected HTS or NbTi conductor. 0.1 K stability is required to maintain current-sharing temperature margin. 15 kW at 4.5 K is derived from the steady-state coil resistive heating plus cryostat heat leak at rated magnet current. Two-train requirement comes from SYS-REQ-010 availability target: single cold box MTBF of ~2000 hours would cause unacceptable plasma interruption frequency without redundancy.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-cry-refrigeration-508">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-015" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-010">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Tritium Plant SHALL account for tritium inventory with measurement uncertainty of plus or minus 1 g or less per 24-hour accounting period and SHALL process all tritiated exhaust streams at throughput of 5 g T/day or greater, achieving a detritiation factor of 1e6 or greater across the Combined Electrolysis and Catalytic Exchange columns, with tritium-contaminated effluent concentration below 10 Bq/L before release to drains.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Plus or minus 1 g per 24 hours is derived from the STK-REQ-004 regulatory accountability requirement; the IAEA safeguards threshold for tritium inventory discrepancy is order 1 g. 5 g T/day throughput covers the burn consumption plus reserve losses at Q=5. Detritiation factor 1e6 ensures effluent tritium concentration meets STK-REQ-013 regulatory limits.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-trp-accountability-508">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-016" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-011">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Power Conversion System steam turbine-generator set SHALL export 100 MW or more net electrical power to the 400 kV grid at rated fusion power, achieving gross-to-net efficiency of 25 percent or greater, and SHALL maintain generation availability of 90 percent or better over a 6-month operational campaign excluding planned maintenance outages.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="100 MW net and 25% efficiency are direct derivations from SYS-REQ-002. 90% generation availability is derived from SYS-REQ-010 (50% operational availability): the power conversion system is not in the critical path during plasma burn, so its availability target is set higher than the burn availability to prevent it limiting overall plant performance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-pcs-output-508">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-018" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-012">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Remote Handling System SHALL replace all divertor cassettes within a maintenance window of 21 calendar days or less, with component positioning accuracy of 2 mm or better in all three translational axes, operating continuously at ambient radiation dose rates up to 0.5 Sv/hr without personnel entry to the tokamak hall, and with manipulator mean time between mission failures of 500 hours or greater.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="21-day divertor replacement is derived from SYS-REQ-009 (4-month total maintenance campaign): divertor replacement is the critical-path activity consuming approximately 25% of the campaign window. 0.5 Sv/hr is the design radiation environment after 30-day shutdown; personnel entry is not permitted above 2 mSv/hr. MTBF 500 hours is set by the campaign duration to limit probability of mid-campaign manipulator failure to below 5%.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-rhs-campaign-508">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-017" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-013">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Vacuum System SHALL evacuate the plasma vessel from atmospheric pressure to base pressure of 1e-6 Pa or less within 24 hours of vessel closure, maintaining effective pumping speed of 50 m3/s or greater from the divertor pumping ducts during burn, and SHALL maintain plasma vessel total outgassing rate below 1e-3 Pa.m3/s at base vacuum.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="1e-6 Pa base pressure is required for ECR-assisted plasma breakdown and to limit impurity influx below 0.1% oxygen-equivalent during burn (SYS-REQ-008). 50 m3/s effective speed is the minimum to balance helium ash production at Q=5. 24 hour pump-down is set by the scheduled maintenance window; longer pump-down would reduce availability below SYS-REQ-010 target.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-vac-pumping-508">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-029" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-014">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Radiation Protection System SHALL classify all plant areas into radiation zones (Supervised, Controlled, High Radiation) based on calculated dose rates and provide interlock signals preventing personnel access to zones where instantaneous dose rate exceeds the worker authorisation level, with zone boundary interlocks responding within 100 ms of dose threshold exceedance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Derived from STK-REQ-012 and SYS-REQ-012 (dose rates below 10 uSv/hr in occupied areas). 100 ms interlock response is set by the maximum dose accumulation before personnel can retreat: at the Controlled Zone boundary dose rate of 2 mSv/hr, 100 ms accumulation is 0.055 uSv, negligible compared to occupational limits.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-rps-zoning-508">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-015" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-015">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Tokamak Core Assembly Vacuum Vessel and In-Vessel Structures SHALL maintain plasma vessel leak rate below 1e-7 Pa m3/s total outgassing rate during plasma operations and shall withstand internal over-pressure of 0.5 MPa from loss-of-coolant accident without gross structural failure.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-008 requires UHV at 1e-6 Pa; this TCA-level requirement allocates the vessel structural contribution to achieving that pressure. The 0.5 MPa LOCA overpressure comes from first-wall coolant pipe rupture analysis — structural failure would breach the primary tritium containment barrier.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; tokamak; sil-3; session-509; idempotency:sub-tca-vessel-509">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-016" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-016">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Tokamak Core Assembly First Wall and Blanket Module SHALL achieve tritium breeding ratio (TBR) contribution of 1.1 or greater as measured from blanket module-level neutronics analysis, using lithium-6 enrichment of at least 40% in the breeding zone.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="TBR ≥ 1.1 is verified by Test: post-irradiation lithium-6 depletion measurements on blanket breeding zone samples extracted during scheduled maintenance, benchmarked against MCNP6 predictions (ISO 14577 protocol). Analysis alone is insufficient for SIL-2; physical activation measurements confirm the as-built breeding performance including manufacturing tolerances on Li-6 enrichment distribution. Changed from Analysis to Test in validation session 520 to satisfy IEC 61508 SIL-2 verification adequacy requirement.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; tokamak; sil-2; session-509; idempotency:sub-tca-tbr-509">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-017" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-017">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="When a plasma disruption current quench is detected, the Tokamak Core Assembly SHALL withstand electromagnetic halo currents and induced eddy currents without permanent deformation of in-vessel structures, and the Vacuum Vessel shall remain leak-tight with leak rate not exceeding 1e-6 Pa m3/s post-disruption.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SIL-3 requirement: structural withstand of halo currents cannot rely on analysis alone (IEC 61508 clause 7.4.6 for SIL-3). Verification is by Test: (a) pulsed-current load tests on structural specimens representing worst-case in-vessel joint geometry, qualifying the structural design; (b) post-disruption vacuum leak check during integrated commissioning (helium leak test at 1e-8 Pa m3/s sensitivity) confirming vessel integrity. ANSYS FEA provides conservatism check but Test verification is the primary acceptance method. Changed from Analysis to Test in validation session 520.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; tokamak; sil-3; safety; session-509; idempotency:sub-tca-disruption-safestate-509">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-018" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-018">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Tritium Plant Plasma Exhaust Processing System SHALL process unburnt DT exhaust gas at a throughput of up to 200 Pa·m³/s, achieving hydrogen isotope separation from helium ash with a decontamination factor of at least 1000 within a single pass at operating pressures between 1×10⁻³ Pa and 1×10⁵ Pa.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="200 Pa·m³/s is the divertor exhaust throughput design point for STEP at full fusion power (500 MW thermal). Decontamination factor 1000 ensures He ash does not accumulate in the DT fuel cycle, which would degrade plasma performance by diluting fuel concentration below the threshold needed for sustained ignition. Derived from SYS-REQ-001 (plasma burn maintenance) and SYS-REQ-005 (tritium confinement).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; tritium-plant; sil-3; session-510; idempotency:sub-trp-peps-throughput-510">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-019" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-019">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Tritium Plant Isotope Separation System SHALL produce DT fuel at a deuterium-tritium purity of greater than 99.9 mol% hydrogen isotopes and a D:T isotope ratio of 50:50 plus or minus 2%, with a throughput capacity of 200 Pa·m3/s DT equivalent.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="99.9% purity and 50:50 D:T ratio are the plasma fueling specifications derived from ITER/DEMO experience showing that HD and HH impurities above 0.1% reduce fusion reactivity below the ignition-sustaining threshold. The 200 Pa·m3/s throughput matches the divertor exhaust capacity. Derives from SYS-REQ-001 and SYS-REQ-003 (TBR and fuel cycle closure).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; tritium-plant; sil-3; session-510; idempotency:sub-trp-iss-purity-510">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-020" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-020">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Tritium Plant Tritium Storage and Delivery System SHALL store tritium inventory in double-contained metal hydride beds with a maximum tritium hold-up of 100 g tritium equivalent, and SHALL release fuel to the Isotope Separation System or fueling systems within 60 seconds of a fuel request command.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="100 g maximum hold-up is set by the site radiological consequence assessment: a catastrophic release of the full storage inventory must not cause a deterministic dose to the public at the site boundary. 60-second release latency ensures the pellet fueling system can maintain plasma fueling rate during transients. Derives from SYS-REQ-005 (tritium confinement) and STK-REQ-004 (tritium accountability).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; tritium-plant; sil-3; session-510; idempotency:sub-trp-tsds-storage-510">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-021" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-021">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Tritium Plant Blanket Tritium Extraction System SHALL extract bred tritium from the lithium-ceramic blanket breeding zone at a rate matching the tritium production rate, maintaining a tritium hold-up in the extraction loop of less than 1 g at all times during steady-state and planned transient operation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Derives from SUB-REQ-016 TBR requirement and SYS-REQ-005 tritium containment. 1 g hold-up limit established from UK site licence conditions on in-process inventory in unshielded areas. 'Steady-state and planned transient' replaces ambiguous 'normal' per ISO 29148; updated validation session 520.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; tritium-plant; sil-2; session-510; idempotency:sub-trp-btes-extraction-510">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-022" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-022">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="When the Tritium Plant atmospheric tritium monitor detects a concentration exceeding 1e-5 Ci/m3 (1 MBq/m3), the Tritium Plant Atmosphere Detritiation System SHALL initiate forced-air recirculation through catalytic oxidation beds within 30 seconds and SHALL achieve a cleanup factor of at least 100 within 4 hours.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="1e-5 Ci/m3 is the controlled area action level per ICRP-68, above which inhalation dose rate to workers exceeds 1 mSv/h. The 30-second initiation time ensures the ADS engages before local concentration exceeds the 10x safety factor above this threshold. Cleanup factor 100 in 4 hours is derived from worst-case maintenance scenario inventory release models for the tritium plant. Derives from SYS-REQ-005 and STK-REQ-011 (RPA dose constraint).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; tritium-plant; sil-3; safety; session-510; idempotency:sub-trp-ads-safestate-510">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-023" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-023">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Superconducting Magnet System Quench Detection and Protection System SHALL detect a resistive voltage signature greater than 100 mV on any superconducting coil within 10 ms and SHALL initiate safe quench discharge within 50 ms of detection, limiting hot-spot temperature to below 300 K.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="100 mV threshold and 10 ms detection time are derived from quench propagation velocity calculations for Nb3Sn conductors at the STEP operating current density. At these parameters, the hot-spot temperature limit of 300 K (below Cu embrittlement at cryogenic temperature) is maintained if dump starts within 50 ms of quench onset. Derives from SYS-REQ-006 (superconducting quench management).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; superconducting-magnet-system; sil-2; safety; session-510; idempotency:sub-sms-quench-detect-510">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-024" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-024">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Superconducting Magnet System Central Solenoid SHALL provide a total flux swing of at least 100 V·s over a plasma pulse, with a maximum ramp rate of 2 V/m during plasma initiation and ramp-up phases.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="100 V·s flux swing drives the transformer-coupled plasma current ramp to 5 MA for STEP operating conditions. The 2 V/m ramp rate limit is set by the inductive coupling to in-vessel components — faster ramp would induce eddy currents exceeding structural limits of the first wall. Derives from SYS-REQ-001 (plasma burn sustainment — CS drives the plasma current required for ignition).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; superconducting-magnet-system; sil-2; session-510; idempotency:sub-sms-cs-flux-510">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-025" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-025">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Superconducting Magnet System TF Coil Set SHALL maintain a toroidal magnetic field of 3.2 T on plasma axis with a field ripple of less than 1% peak-to-peak at the plasma separatrix during steady-state plasma burn.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="3.2 T on-axis field is the minimum required for Q&gt;=5 burn per SYS-REQ-001 physics basis. Field ripple below 1% is required to prevent ripple-induced fast-ion loss exceeding 5% of alpha power, which would degrade energy confinement and damage first wall.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; superconducting-magnet-system; session-511; sil-2; idempotency:sub-tf-field-performance-511">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-026" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-026">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Superconducting Magnet System Magnet Power Supply System SHALL energise the TF Coil Set to full field in less than 2 hours and the CS Coil to maximum current in less than 30 minutes, with a current ripple not exceeding 10 ppm of full scale.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="2-hour TF ramp-up is derived from operational availability target SYS-REQ-010 (50% availability): longer ramp increases duty cycle losses. 10 ppm current ripple is required to prevent field noise from perturbing plasma equilibrium feedback. Derived from PCS interface requirement for field accuracy.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; superconducting-magnet-system; session-511; sil-2; idempotency:sub-mpss-energisation-511">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-027" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-027">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="When a quench interlock signal is received, the Superconducting Magnet System Magnet Power Supply System SHALL open all coil current loops and connect dump resistors within 5 ms, extracting stored magnetic energy into external dump resistors and limiting coil current decay rate to less than 500 A/s.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Safe state for SYS-REQ-006 quench hazard. 5ms response derived from IFC-REQ-024 hardwired interlock requirement. Limiting decay rate to 500 A/s prevents excessive induced voltages in neighbouring coils and vacuum vessel structures that could cause secondary damage or arc flash.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; superconducting-magnet-system; session-511; sil-2; safe-state; idempotency:sub-mpss-energy-extraction-511">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-028" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-028">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Superconducting Magnet System TF Coil Set SHALL maintain superconducting operation at a winding-pack temperature of 4.5 K ± 0.1 K, with a minimum thermal margin of 1.5 K between operating temperature and critical temperature under maximum conductor current.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Nb3Sn conductor critical temperature is approximately 18 K at operating field. Operating at 4.5 K provides 1.5 K thermal margin above nominal; reduced margin risks inadvertent quench during plasma disruptions which deposit eddy-current heating. ITER and SPARC coil margin analyses confirm 1.5 K as minimum safe margin.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; superconducting-magnet-system; session-511; sil-2; idempotency:sub-tf-cryo-temperature-511">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-029" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-029">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Vacuum System Turbomolecular Pump Array SHALL maintain plasma vessel pressure below 1×10⁻⁶ Pa during plasma operations and achieve a base pressure of 1×10⁻⁷ Pa or below within 24 hours of vessel baking at 200°C.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="1e-6 Pa plasma vessel pressure is the maximum tolerable impurity partial pressure derived from plasma purity requirements in SYS-REQ-001 — higher neutral gas density causes radiative collapse of the plasma. 24-hour pump-down time is derived from operational availability targets in SYS-REQ-010.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="rt-resolved-session-531">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-030" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-030">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Vacuum System Pressure Monitoring System SHALL measure plasma vessel pressure continuously over the range 1×10⁻⁸ Pa to 1×10⁻² Pa with an accuracy of ±10% of reading, and SHALL generate an interlock signal to the Plasma Control System within 200 ms when vessel pressure exceeds 1×10⁻⁴ Pa.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="1e-4 Pa interlock threshold is 100x above operating pressure, providing a safety margin while preventing false trips. 200 ms response is derived from the PCS plasma control loop response time — the interlock must propagate before a contamination event causes irreversible first-wall damage or uncontrolled plasma termination.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="rt-resolved-session-531">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-031" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-031">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Cryogenic Plant Helium Refrigeration System SHALL provide minimum refrigeration capacity of 8 kW at 4.5 K per cold box train, with at least two independent trains operational simultaneously, such that loss of any single train does not reduce total available cooling below 8 kW.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Magnet steady-state heat load at full excitation is ~13 kW at 4.5K. Two 8kW trains gives 16kW nominal with 3kW margin. IEC 61508 SIL 2 availability target for cryo cooling (mission time 8,760 h/yr) requires single-failure tolerance. ITER cryoplant uses N+1 cold box configuration on same basis.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; cryogenic-plant; sil-2; session-513; idempotency:sub-hrs-capacity-513">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-032" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-032">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Cryogenic Plant Helium Management System SHALL capture and recover not less than 95% of the helium gas released during a superconducting magnet quench event (up to 200 m³ STP per event) within 2 hours of quench onset, purifying recovered gas to ≥ 99.999% purity before returning it to the refrigerator supply.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Helium is a limited, non-renewable resource valued at ~£30/m³ STP. A full magnet quench releases ~200m³. Failure to recover ≥95% within 2 hours forces operational deferral until helium inventory is replenished, directly threatening the ≥50% availability target of SYS-REQ-010. The 2-hour window is constrained by compressor capacity and cold trap regeneration time.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; cryogenic-plant; sil-2; session-513; idempotency:sub-hms-recovery-513">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-033" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-033">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Cryogenic Plant Cryogenic Transfer Line Network SHALL maintain total static heat ingress to the 4.5 K helium circuit below 500 W across all transfer lines under steady-state conditions, with each individual line segment not exceeding 10 W/m.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Static heat ingress adds directly to HRS refrigeration load. Exceeding 500W would exhaust the 3kW margin in the dual-train design, risking magnet temperature excursion. The 10W/m per-segment limit is consistent with ITER vacuum-jacketed line performance specification and enables allocation to individual lines during procurement.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; cryogenic-plant; sil-2; session-513; idempotency:sub-ctln-heatleak-513">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-034" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-034">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Cryogenic Plant Cryogenic Control System SHALL automatically execute the magnet cool-down sequence from 300 K to 4.5 K at a rate not exceeding 5 K/hour at any point on the superconducting coil winding packs, completing the sequence within 72 hours under nominal refrigerator operation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Thermal gradients &gt;5K/hour risk delamination of the epoxy-impregnated HTS coil winding packs due to differential thermal expansion. 72-hour window is the agreed maintenance campaign slot. Automated control is required because the 2,000+ sensor points make manual management impractical and error-prone.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; cryogenic-plant; sil-2; session-513; idempotency:sub-ccs-cooldown-513">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-035" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-035">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="When the Cryogenic Control System detects an internal fault (controller failure, loss of communication to &gt;50% of sensors, or watchdog timeout), the Cryogenic Plant SHALL transition to a safe hold state within 10 seconds: closing helium supply valves to all magnet circuits, initiating helium boil-off venting to the recovery system, and issuing a quench-interlock signal to the Superconducting Magnet System.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Loss of CCS control authority during magnet excitation risks undetected cryogenic failure leading to uncontrolled quench. SIL 2 safe state requirement per IEC 61508: de-energise (close isolation valves) and alert dependent systems (SMS quench interlock) within a time window derived from magnet stored energy dissipation rate. 10-second limit is consistent with minimum response time of SMS quench detection system.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; cryogenic-plant; sil-2; safety; safe-state; session-513; idempotency:sub-ccs-safestate-513">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-036" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-036">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Remote Handling System SHALL position the In-Vessel Inspection and Maintenance Manipulator end-effector to within ±1 mm of target coordinates in the tokamak vessel coordinate frame, verified under thermal soak conditions at vessel wall temperature 150°C.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-009 specifies ≤2 mm component positioning accuracy. The IVIMM contributes ≤1 mm to the error budget, with ≤1 mm allocated to tooling alignment, totalling ≤2 mm system accuracy. 1 mm IVIMM accuracy is achievable with laser tracker feedback per ITER RH arm specification (ITER_D_3LFATQ).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; remote-handling-system; sil-1; session-514; idempotency:sub-rhs-manipulator-accuracy-514">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-037" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-037">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Remote Handling System SHALL complete a full blanket module exchange cycle (remove all 18 blanket modules, install replacement set) within 90 calendar days, operating on a 2-shift pattern with planned equipment maintenance windows.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-009 allows 4 months (120 days) for replacement of all in-vessel components. The 90-day allocation to blanket exchange allows 30 days for divertor cassette exchange within the same campaign. 90 days was derived from ITER RAMI analysis ITER_D_FFNMWJ showing 3 modules per day achievable with 2 IVIMM arms operating in parallel.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; remote-handling-system; sil-1; session-514; idempotency:sub-rhs-campaign-duration-514">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-038" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-038">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Remote Handling System SHALL maintain full functionality after cumulative absorbed dose of 1×10^6 Gy (gamma + neutron equivalent) at any in-vessel component, with no degradation of positioning accuracy exceeding 10% of the specified ±1 mm tolerance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STEP in-vessel components are exposed to total neutron fluence of ~3×10^22 n/m² over 10 full-power years. Remote handling equipment operating in-vessel must be qualified to the same radiation environment. 10^6 Gy is consistent with ITER radiation hardening specification for in-vessel tools and represents a conservative envelope for STEP operations.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; remote-handling-system; sil-1; session-514; idempotency:sub-rhs-rad-hardening-514">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-039" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-039">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Remote Handling Transfer Cask SHALL provide biological shielding such that dose rate at the cask outer surface does not exceed 2 mSv/hr when loaded with a fully irradiated blanket module, measured at 0.1 m from the surface per ISO 2919.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="UK Ionising Radiations Regulations 2017 classify any area exceeding 7.5 mSv/hr as a supervised radiation area. The 2 mSv/hr limit maintains dose rates in the cask transfer corridor below this threshold with margin, allowing controlled area designation (3/10 of 2 mSv/hr averaged over 40-hour working week &lt; 6 mSv/year occupational exposure limit).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; remote-handling-system; sil-1; session-514; idempotency:sub-rhs-cask-shielding-514">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-040" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-040">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="When any Remote Handling System equipment fault is detected (loss of position feedback, motor overcurrent, cable tension alarm), the Remote Handling System SHALL halt all actuators within 500 ms and lock joints in their current positions, maintaining load without drift for ≥ 30 minutes to allow manual recovery planning.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="A suspended load (up to 4.6 tonne blanket module) inside the vessel under automated fault condition is the primary hazard. 500 ms halt preserves positioning before any gravity-driven drift exceeds 2 mm tolerance. 30-minute hold time is derived from minimum human response time for emergency team mobilisation plus decision cycle.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; remote-handling-system; sil-1; session-514; idempotency:sub-rhs-safe-state-514">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-041" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-041">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Power Conversion System SHALL deliver ≥ 100 MW net electrical power to the 400 kV grid connection point during steady-state plasma burn, after deducting all plant auxiliary loads including cryogenic plant, plasma heating, and pumping.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-002 mandates ≥100 MW net at 400 kV. Net output = gross turbine output (120 MW nominal) minus station auxiliary load (~20 MW for cryo plant, magnets, heating, pumping). The 100 MW net target is the commercial demonstrator mission requirement per STEP Programme Definition document.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="rt-resolved-session-531">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-042" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-042">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Power Conversion System SHALL achieve gross-to-net thermal efficiency ≥ 25%, calculated as net electrical output divided by total fusion thermal power, under steady-state conditions at rated plasma Q ≥ 5.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Gross-to-net thermal efficiency is directly verifiable by Test: measure net electrical power at 400 kV grid metering point and total fusion thermal power from calorimetric balance during first sustained full-power burn (Q≥5). VER-REQ-067 covers this. Changed from Analysis to Test in validation session 520 to meet IEC 61508 SIL-1 verification standard; analysis may predict efficiency but measured commissioning data is the acceptance criterion.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="rt-resolved-session-531">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-043" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-043">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Power Conversion System SHALL deliver electricity at 400 kV ± 5%, 50 Hz ± 0.5 Hz, with harmonic distortion &lt; 3% THD, compliant with National Grid ESO Grid Code CC.6 and the Connection and Use of System Code (CUSC).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-015 mandates Grid Code compliance. UK Grid Code CC.6 specifies voltage and frequency tolerances at the point of connection. Harmonic distortion &lt;3% THD is the EN 61000-2-4 Class 2 limit for industrial generators. Failure to comply risks grid connection agreement revocation and prevents commercial operation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; power-conversion-system; sil-1; session-514; idempotency:sub-pcs-grid-code-514">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-044" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-044">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Steam Generator and Heat Transfer System SHALL transfer ≥ 500 MWth from the primary coolant circuit to the secondary steam circuit at steady-state plasma burn, maintaining primary outlet temperature ≤ 180°C to protect breeding blanket structural integrity.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STEP primary coolant enters steam generators at ~300°C and must return at ≤180°C to maintain adequate blanket module cooling margin (blanket outlet target 280°C with 20°C margin). The 500 MWth transfer duty matches fusion thermal power at Q=5 with allowance for 10% peaking. Under-cooling would elevate primary outlet temperature, reducing blanket safety margin.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="rt-resolved-session-531">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-045" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-045">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="When a plasma disruption is signalled by the Plasma Control System, the Power Conversion System SHALL execute a controlled turbine runback to 20% rated load within 60 seconds without turbine trip, preserving grid connection and enabling rapid restart on plasma re-ignition.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Plasma disruptions are expected at ~1/month frequency during commissioning. A full turbine trip per disruption would impose unacceptable wear on turbine blades and impose 4-hour restart penalties reducing operational availability below the 50% SYS-REQ-010 target. Runback to 20% maintains condenser vacuum and feedwater chemistry stable for &lt;10 minute plasma restart.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; power-conversion-system; sil-1; session-514; idempotency:sub-pcs-turbine-runback-514">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-037" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-049">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Tritium Plant Isotope Separation System SHALL operate on electrical power supplied at 415 V AC (three-phase) with a maximum continuous power demand of 350 kW and a peak demand not exceeding 420 kW during column start-up, and SHALL include an uninterruptible power supply sized for 30 minutes of safe shutdown operation following loss of grid power.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="350 kW continuous and 420 kW peak derived from cryogenic distillation column heat load analysis: column reboilers 220 kW, compressors 80 kW, controls 50 kW. The 30-minute UPS duration matches estimated time to reach thermally stable safe shutdown where column inventories are below hazardous tritium levels. Derives from SYS-REQ-003 (fuel cycle closure) and SYS-REQ-005 (tritium confinement).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-iss-power-budget-516">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-038" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-050">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Tritium Plant Isotope Separation System SHALL accept an emergency isolation command from the Plant Protection System that terminates cryogenic distillation column operations and isolates all tritium-bearing process streams within 30 seconds, and SHALL maintain a passive safe state without operator input for at least 4 hours following loss of automated process control.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Derives from SYS-REQ-005 (tritium containment SIL-3). 30-second isolation window derived from atmospheric tritium dispersal rate model: at maximum process inventory, delay beyond 30 s risks exceeding 0.1 g release limit under worst-case single-pipe-rupture scenario. 4-hour passive safe state period allows operator team assembly and controlled recovery. 'Automated process control' replaces ambiguous 'normal process control' per ISO 29148; updated validation session 520.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-iss-safety-override-516">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-039" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-051">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Power Conversion System SHALL be housed in a dedicated turbine hall building with a structural floor load rating of at least 15 kN/m², designed to contain steam turbine (rated 180 MWe), generator, condenser, feedwater heaters, and associated balance-of-plant equipment, with physical maintenance access clearances of at least 2 m on all major equipment faces.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Power Conversion System is a large physical installation requiring dedicated structural housing to manage thermal, vibration, and acoustic loads from rotating machinery. The 15 kN/m² floor rating is the minimum for 100+ tonne steam turbine sets. Physical access clearance requirements ensure maintainability of the primary heat removal path. Derives from SYS-REQ-009 (electrical power export) and IFC-REQ-004 (thermal power interface).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Inspection">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-pcs-physical-housing-516">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-040" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-052">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Tritium Plant SHALL be housed in a dedicated, single-storey Category 1 confinement building constructed to nuclear-grade seismic standards, with minimum concrete wall thickness of 600 mm providing radiation shielding, and containing all tritium-bearing process systems within a secondary confinement envelope of at least 2500 m³ total enclosed volume.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The tritium plant handles tritium inventory up to 100 g (SIL-3 consequence), requiring a purpose-built Category 1 nuclear building for structural integrity, shielding, and secondary confinement. The 600 mm wall thickness is the minimum for 10 GBq/m² surface dose rate attenuation. The physical building specification flows from STK-REQ-003 (safety assessment principles) and SYS-REQ-005 (tritium confinement).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Inspection">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-trp-physical-housing-516">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-041" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-053">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Cryogenic Plant SHALL be housed in a dedicated plant building with insulated floor area of at least 800 m², minimum clear height of 8 m, and structural provisions for helium cold box support frames rated to carry 50 tonne loads, providing segregated bays for helium compressors, cold boxes, liquid helium dewars (minimum 10,000 L capacity), and control room.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The cryogenic plant requires a dedicated physical building due to the hazardous nature of cryogenic helium (oxygen displacement risk) and the large physical footprint of Collins-cycle refrigerators and cold boxes. The 800 m² floor area and 8 m clear height are the minimum dimensions for a 80 kW-at-4.5K refrigeration plant consistent with ITER cryogenic plant precedent. Derives from SYS-REQ-011 (superconducting magnet operation) and SUB-REQ-009 (cryogenic cooling).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Inspection">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-crp-physical-housing-516">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-042" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-054">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Vacuum System SHALL comprise physical vacuum equipment mounted on the tokamak support structure, including 12 turbomolecular pump assemblies each housed in bolted flange enclosures rated to 1.5 bar differential pressure, roughing pump sets located in an adjacent pump bay with concrete biological shielding for activated component handling, and vacuum manifold pipework with total metal bellow-jointed volume compatible with the 1000 m³ plasma vessel.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The vacuum system is a physical installation of pumps, valves, and pipework mounted on the tokamak that must meet structural, shielding, and maintenance requirements. The flange pressure rating, pump bay shielding, and manifold sizing specify physical constraints that ensure safe installation and maintenance of radioactive equipment. Derives from SYS-REQ-008 (vacuum integrity) and IFC-REQ-016 (vacuum system interface).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Inspection">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-vac-physical-housing-516">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-055" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-055">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Tokamak Core Assembly, Superconducting Magnet System, and Cryogenic Plant structural support systems SHALL be designed to withstand Operational Basis Earthquake (OBE) peak ground acceleration of 0.1g and Safe Shutdown Earthquake (SSE) of 0.2g without loss of structural integrity, and SHALL maintain plasma vessel vacuum boundary integrity after an OBE event to allow post-event inspection.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Derives from SYS-REQ-011 (seismic fast shutdown). ONR Safety Assessment Principles require the primary containment and safety function support structures to maintain integrity through OBE; SSE doubles the margin. Analysis via seismic qualification reports (ASCE 4-16 methodology) is appropriate for civil/structural seismic compliance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Analysis">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-seismic-structural-validation-527">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-056" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-056">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Tokamak Core Assembly in-vessel cooling circuit SHALL include a passive decay heat removal path capable of removing 10 MW or greater after plasma termination without reliance on active pumps, powered valves, or external power supply, using natural convection or gravity-driven flow to a heat sink maintained at ambient temperature.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Derives from SYS-REQ-007 (passive decay heat removal after LOCA). 10 MW threshold is derived from neutron activation analysis of first wall and blanket materials at rated neutron fluence; peak afterheat at 1s post-shutdown is approximately 8 MW, 10 MW adds 25% margin per nuclear design convention. Passive mechanism is mandated by IEC 61513 for loss-of-power scenarios; no active system survives a LOCA+loss-of-offsite-power combined initiator.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-decay-heat-passive-validation-527">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-057" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-057">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="When an operator-initiated or scheduled end-of-pulse command is received, the Plasma Control System SHALL execute a controlled plasma shutdown sequence: reduce auxiliary heating power to zero within 60 s, ramp plasma current from operating to zero over 10–30 s via ohmic coil action, cease DT fuel injection no later than 30 s before plasma current zero, and confirm plasma current extinction within 35 s of command receipt. The shutdown sequence SHALL complete without triggering a disruption.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Derives from SYS-REQ-001 (6-hour pulse implies a defined end-of-pulse transition) and the Planned Shutdown operating mode (STK S-001). A controlled current ramp-down is essential to prevent triggering a disruption during shutdown — a rapid uncontrolled de-energisation at high plasma current induces halo currents that exceed TCA structural design loads. The 10-30s ramp time is derived from plasma current decay time constant constraints for the TF/OH coil system. This requirement fills the mode coverage gap: Emergency Shutdown is covered by SUB-REQ-005, but Planned Shutdown was previously implicit only.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-pcs-planned-shutdown-529">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-023" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-058">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Tritium Plant SHALL maintain tritium accountancy and confinement functions if any single active component fails, with automatic isolation of the failed component within 30 seconds and continued operation of remaining processing loops at not less than 50% of rated throughput.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Tritium Plant is System-Essential (classified as such by UHT hex 52953218); a total shutdown requires plant-level shutdown and unplanned tritium inventory mobilisation, creating a radiological hazard. Single-failure tolerance at 50% throughput is the minimum operability margin allowing the plasma to continue operation at reduced duty cycle while maintenance is performed.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-tp-redund-qc-512">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-024" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-059">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Tritium Plant Isotope Separation System SHALL provide a hardwired manual override that, when asserted, shuts down all ISS process flows and closes all feed and product valves within 10 seconds, independent of the ISS automation system, and SHALL maintain a watchdog timer that triggers automatic process shutdown if no heartbeat is received from the supervisory control system within 60 seconds.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ISS is classified as Functionally Autonomous (hex 55973219, bit 15) and handles tritium at purity levels that could cause off-specification fuel delivery. The manual override and watchdog are required to maintain human authority over the autonomous separation process in accordance with ITER-like safety categorisation. The 60-second watchdog matches the maximum permissible undetected loss of control in the tritium plant safety assessment.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-iss-override-qc-512">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-072" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-060">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="When any single turbomolecular pump in the Vacuum System Turbomolecular Pump Array fails, the remaining operational pumps SHALL maintain plasma vessel pressure at or below 5×10⁻⁶ Pa within 120 seconds of the failure, and SHALL trigger a control room alarm within 10 seconds of pump fault detection.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="A single pump failure must not force immediate plasma termination. The 5×10⁻⁶ Pa degraded limit provides a 5x safety margin above the radiative collapse threshold while losing one pump from the N+2 redundant array. 120 s recovery time is derived from PCS tolerance: slow pressure rise is tolerated but interlock triggers at 1e-4 Pa (per SUB-REQ-030). Addresses rt-missing-failure-mode finding on SUB-REQ-029.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="event">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-vac-pump-failmode-v3-531">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-073" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-061">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="When the Vacuum System Pressure Monitoring System detects a sensor fault (loss of signal, out-of-range reading, or calibration validation failure on any gauge), it SHALL flag the affected channel as invalid within 5 seconds, maintain pressure monitoring continuity using remaining gauges, and issue a control room alarm; the system SHALL NOT generate false interlock signals to the Plasma Control System on sensor fault.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Pressure monitoring is safety-critical; a false interlock causes unnecessary plasma termination while a missed real interlock risks runaway. The fail-safe design requires explicit faulty-sensor detection and degraded-mode continuity. 5-second fault detection ensures PCS receives fault notification before its 200 ms control loop deadline. Addresses rt-missing-failure-mode finding on SUB-REQ-030.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="event">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-vac-monitor-failmode-v3-531">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-074" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-062">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="When the Power Conversion System operates at reduced plasma thermal input (Q ≥ 3 but &lt; 5), the PCS SHALL maintain net positive export to the 400 kV grid connection at a floor of ≥ 50 MW, with station auxiliary loads below 20 MW; if net export drops below 50 MW, the PCS SHALL alert the shift supervisor within 30 seconds.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Reduced fusion gain (Q=3) is a planned operating condition during burn campaigns when impurity accumulation or density limits are encountered. At Q=3 thermal output falls to ~60% of nominal; the PCS must still provide positive net export to satisfy commercial viability criteria in the STEP business case. The 50 MW floor is the minimum commercially meaningful export. Addresses rt-missing-failure-mode finding on SUB-REQ-041.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="event">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-pcs-degraded-power-v3-531">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-075" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-063">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="When any single Power Conversion System component (steam generator, turbine stage, or condenser circuit) is taken out of service for maintenance, the PCS SHALL operate in degraded configuration and maintain gross-to-net thermal efficiency ≥ 18%, with a net electrical output floor of ≥ 60 MW, for up to 72 hours until the component is restored or the plasma pulse is terminated.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Single steam generator isolation (2 of 3 steam circuits) reduces thermodynamic efficiency to ~72% of rated, giving an 18% gross-to-net floor. The 72-hour degraded window matches the planned maintenance cycle for compressor rebalancing and pump seal replacement without requiring pulse termination. Addresses rt-missing-failure-mode finding on SUB-REQ-042.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="event">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-pcs-degraded-efficiency-v3-531">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-076" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-064">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="When a steam generator tube leak is detected by the Steam Generator and Heat Transfer System (primary-to-secondary pressure differential loss or secondary water conductivity spike above baseline), the system SHALL automatically isolate the affected steam generator within 60 seconds, and SHALL continue heat transfer at ≥ 300 MWth using remaining circuits, with primary coolant temperature maintained at ≤ 200°C.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Steam generator tube failure is an anticipated maintenance event due to neutron embrittlement and thermal cycling fatigue. Automatic isolation within 60 s prevents tritiated primary water from migrating into the steam secondary circuit — tritium transport time across a tube-leak interface is 30-90 s, so 60 s isolation limits release to below 1 mg per event, well below the 0.1 g single-event limit in SYS-REQ-005. Addresses rt-missing-failure-mode finding on SUB-REQ-044.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="event">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-sg-tube-leak-failmode-v3-531">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-117" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-066">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Vacuum System Pressure Monitoring System SHALL operate from a dedicated UPS-backed 230V AC supply, consuming no more than 2 kW total, and SHALL maintain full measurement capability within 1 second of primary supply failure during plasma burn, switching to battery backup rated for 8 hours continuous operation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The VSPMS is classified as Powered (Substrate trait bit 4). A vacuum leak during plasma burn requires sub-second detection and response; loss of pressure monitoring capability is a precursor to uncontrolled plasma disruption. The 8-hour backup requirement covers extended maintenance or grid disturbance scenarios during which the vacuum boundary must be continuously monitored. The 2 kW consumption budget is consistent with the instrument density of the monitoring array.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-vspms-power-budget-qc-550">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-118" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-067">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Cryogenic Plant SHALL incorporate N+1 redundancy for all compressor trains and cold-box modules, such that loss of any single compressor or cold-box unit does not reduce helium refrigeration capacity below 80% of nominal, and the system SHALL restore full refrigeration capacity within 4 hours by hot-swap of the failed unit without requiring magnet warm-up.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Cryogenic Plant is classified System-Essential (Substrate trait bit 16) — loss of helium refrigeration causes magnet warm-up, disruption of plasma operations, and a multi-week recovery cycle. N+1 redundancy is the minimum architecture to ensure a single equipment failure does not force a campaign-ending magnet quench. The 4-hour recovery time is derived from the magnet temperature budget: TF coil thermal mass allows 4 hours without active refrigeration before exceeding the critical current margin by more than 10%.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-cryo-redundancy-qc-550">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-119" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-068">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Tritium Plant SHALL implement dual independent confinement barriers on all processing and storage vessels, with automatic isolation valve actuation within 500 ms of any primary confinement breach signal, and SHALL maintain tritium accountancy and emergency isolation functions on a dedicated safety-class power supply independent of the plant normal supply.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Tritium Plant is classified both System-Essential (bit 16) and Ethically Significant (bit 32). Tritium release is the primary radiological hazard to the public and workforce; dual independent confinement barriers are the minimum defence-in-depth required by ONR safety assessment principles. The 500 ms isolation actuation time is derived from tritium dispersion modelling: at worst-case leak rates, isolating within 500 ms limits the release to below the threshold for offsite emergency notification under IRR 2017. Derives from SYS-REQ-005.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-tritium-redundancy-qc-550">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-120" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-069">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Superconducting Magnet System SHALL implement independent quench detection channels on each coil, with a minimum of two independent vote-2-of-3 detection chains per coil group, such that a single channel failure does not prevent quench detection or initiate a spurious magnet dump, and the system SHALL dump stored coil energy into dedicated dump resistors within 10 s of a confirmed quench signal.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Superconducting Magnet System is System-Essential (bit 16); a missed quench causes coil destruction and an unrecoverable campaign loss. Vote-2-of-3 quench detection is the established design pattern for fusion devices (JET, ITER) to balance false-positive avoidance against miss probability. The 10-second dump time is derived from the maximum energy deposited in the quench zone before conductor damage occurs at the design current margin. Derives from SYS-REQ-006.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-magnet-redundancy-qc-550">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-121" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-070">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Radiation Protection System SHALL implement engineering ALARA measures at subsystem level: remote handling replacement of all components rated &gt;10 mSv/h contact dose, biological shielding in maintenance aisles to &lt;0.5 mSv/h, and personnel dose tracking with automatic withdrawal notification when individual accumulated dose exceeds 80% of the annual constraint (1 mSv above background).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-016 mandates ALARA under UK IRR 2017 at system level; this requirement decomposes ALARA into subsystem-actionable constraints. Remote handling above 10 mSv/h is the ONR-guidance threshold beyond which contact work is ALARA-unjustifiable. The 0.5 mSv/h maintenance aisle limit is derived from a 2-hour maximum maintenance visit budget to remain below the 1 mSv annual dose constraint. Automatic 80%-threshold notification is the standard nuclear industry practice for individual dose management.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Inspection">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sub-alara-radiation-qc-550">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-122" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-071">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify REQ-SESTEPFUSIONPOWERPLANT-117: On the VSPMS integration test bench, switch off the primary 230V AC supply and measure time-to-restore measurement capability; confirm ≤1 second switchover. Run VSPMS on battery backup for 8 hours at nominal load; confirm continuous measurement within specification throughout. Measure total system power draw under nominal operating conditions; confirm ≤2 kW.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Power continuity and budget are verified by injection and measurement rather than analysis because the requirement specifies hard numeric thresholds at a subsystem level. Timing and power draw can only be confirmed empirically on the actual hardware.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-vspms-power-qc-550">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-123" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-072">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify REQ-SESTEPFUSIONPOWERPLANT-118: During Cryogenic Plant Factory Acceptance Test, disable one compressor train and measure steady-state refrigeration capacity; confirm ≥80% of nominal. Commence replacement of disabled unit and verify that full capacity is restored within 4 hours without requiring controlled magnet warm-up cycle. Repeat for each N+1 module in sequence.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="N+1 redundancy and hot-swap capability must be demonstrated by actual failure injection at FAT; analysis cannot confirm the 4-hour restoration target without testing actual maintenance procedures and thermal transient behaviour.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-cryo-redundancy-qc-550">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-073" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-073">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Remote Handling System SHALL implement a dual-path control architecture with independent main and backup control rooms, such that loss of the primary control station does not prevent completion of any in-progress maintenance task, and full Remote Handling System capability SHALL be restorable from the backup station within 15 minutes.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Remote Handling System is classified System-Essential (UHT trait bit 16): loss of RHS during in-vessel maintenance leaves activated components in an irrecoverable mid-operation state, creating radiological and structural hazards. Dual control path is the minimum redundancy for a safety-critical human interface. The 15-minute switchover time is derived from the maximum safe hold time for suspended tooling loads inside the vacuum vessel (based on tritium permeation and structural stability limits for unsupported blanket modules).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; remote-handling-system; redundancy; sil-1; session-552; idempotency:sub-rhs-redundancy-dual-path-552">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-074" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-074">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Superconducting Magnet System Magnet Power Supply System SHALL implement N+1 redundancy for all AC/DC converter modules, such that loss of any single converter does not reduce total available magnet current by more than 10%, and the system SHALL continue plasma-sustaining magnetic field without initiating a disruption.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Superconducting Magnet System is classified System-Essential (UHT trait bit 16). The MPS is the only source of current for all 18 TF coils and the CS; a single-converter failure with no redundancy would require controlled current ramp-down and plasma termination, losing the plasma campaign. N+1 converter redundancy is the minimum to sustain field during a single module failure. The 10% tolerance is derived from the TF coil current regulation envelope — field variation up to 10% above/below nominal is recoverable by PCS feed-forward control without disruption.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; superconducting-magnet-system; redundancy; sil-2; session-552; idempotency:sub-sms-mps-n1-redundancy-552">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-075" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-075">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Vacuum System SHALL implement N+1 redundancy for all primary and backing pump trains on the torus and neutral beam injection lines, such that loss of any single pump does not increase torus base pressure above 5e-6 Pa, and the standby pump SHALL achieve full pumping speed within 60 seconds of primary pump trip.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Vacuum System is System-Essential (UHT trait bit 16). Loss of primary pumping capability causes impurity ingress that poisons plasma operations; without redundancy a single pump failure forces plasma termination and extended pump-down recovery. N+1 pump redundancy is standard practice for nuclear vacuum systems. The 5e-6 Pa threshold (5x the nominal 1e-6 Pa base) is derived from plasma sustainability modelling: impurity fraction above 0.5 percent causes effective Z &gt; 1.5, terminating the burn. The 60-second standby activation time is derived from the torus outgassing rate at operational temperatures.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; vacuum-system; redundancy; sil-2; session-552; idempotency:sub-vs-pump-n1-redundancy-552">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-076" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-076">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Vacuum System SHALL qualify all torus vacuum vessel seals and penetration flanges to a leak rate of less than 1e-9 Pa m3/s per seal under all operational modes including plasma burn, bake-out at 350 degrees C, and seismic loading at 0.1g OBE, with helium leak testing performed at each maintenance interval before plasma operations resume.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-008 mandates total torus leak rate below 1e-9 Pa m3/s per seal during all operational modes; this SUB requirement decomposes that constraint onto the specific seal qualification programme. Three modes drive the envelope: bake-out at 350 degrees C generates maximum thermal expansion stresses on ConFlat flanges; plasma burn creates neutron fluence degradation of elastomeric components over time; OBE seismic event imposes dynamic loads on all penetrations. Helium leak testing at each maintenance interval is required because the tokamak assembly undergoes thermal cycling that can relax flange preloads.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; vacuum-system; sil-2; session-552; idempotency:sub-vs-seal-qualification-552">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-078" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-078">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="When a Design Basis Accident is declared, the Tritium Plant SHALL automatically isolate all tritium process and storage vessels within 30 seconds and initiate passive Atmosphere Detritiation System activation, ensuring tritium release to the environment does not exceed 1 g total inventory escape per DBA event, consistent with the ONR Basic Safety Level dose limit of 1 mSv effective dose to any member of the public.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-018 defines the DBA set with tritium release as the primary radiological pathway. The Tritium Plant holds the largest on-site tritium inventory; automatic isolation within 30 seconds is derived from atmospheric dispersion modelling showing 1 g escape limit is achievable only with immediate isolation. Failure to decompose this to the Tritium Plant would leave the most safety-critical DBA pathway without a verifiable subsystem-level requirement.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; tritium-plant; sil-3; dba; session-553; idempotency:sub-tritiumplant-dba-isolation-553">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-079" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-079">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Tokamak Core Assembly SHALL define and implement Design Basis Accident response for in-vessel component failure and loss-of-cooling events such that effective dose to any member of the public does not exceed 1 mSv within the 48-hour post-event monitoring period, with passive decay heat removal maintaining first-wall temperature below material damage thresholds for a minimum of 72 hours without active cooling.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-018(b) and (d) define in-vessel failure and loss-of-cooling as explicit DBAs. The Tokamak Core Assembly houses the activated first-wall and blanket structures that are the primary heat source during loss-of-cooling; the 72-hour passive cooling window is derived from maintenance access planning for post-accident recovery, and 1 mSv dose limit flows directly from SYS-REQ-018 Basic Safety Level specification.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Analysis">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; tokamak-core-assembly; sil-3; dba; session-553; idempotency:sub-tca-dba-cooling-553">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-080" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-080">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Tritium Plant SHALL operate all tritium handling and storage activities under an approved Radiological Risk Assessment conforming to UK Ionising Radiations Regulations 2017 (SI 2017/1075), with routine operational whole-body dose to any worker not exceeding 1 mSv/year above background, a designated Radiation Protection Supervisor nominated for each work area, and all tritium inventories logged to ±0.1 g accuracy in the site nuclear material accountancy system.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-016 specifies UK IRR 2017 compliance and ALARA dose management. The Tritium Plant is the primary tritium handling system on site and the principal location of occupational dose risk; without a subsystem-level requirement, the IRR 2017 obligation has no owner in the decomposition and cannot be verified at subsystem CDR.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Inspection">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; tritium-plant; sil-3; regulatory; session-553; idempotency:sub-tritiumplant-irr2017-553">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-081" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-081">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Vacuum System SHALL maintain plasma vessel seal integrity during all operational modes — including steady-state plasma burn, inter-shot vessel conditioning, and remote maintenance access — with individual penetration leak rate not exceeding 1×10⁻⁹ Pa·m³/s and total vessel leak rate not exceeding 1×10⁻⁶ Pa·m³/s combined, verified by residual gas analysis following every vessel intervention.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-008 specifies per-seal and total vessel leak rate limits. This subsystem requirement decomposes SYS-REQ-008 to the Vacuum System as the responsible subsystem for vessel boundary integrity. The additional requirement for RGA verification after every intervention prevents undetected seal degradation during maintenance campaigns, which is the primary failure mode for vacuum boundary loss.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; vacuum-system; sil-2; session-553; idempotency:sub-vacuum-seal-modes-553">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-082" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-082">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Tritium Plant SHALL maintain all required environmental permits under the Environmental Permitting (England and Wales) Regulations 2016 and compliance with the Nuclear Installations Act 1965 as administered by the Office for Nuclear Regulation, with tritium atmospheric discharges logged against authorised limit conditions and annual third-party audit of the site Environmental Management System conforming to ISO 14001:2015 demonstrating continuous compliance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-019 mandates EP Regulations 2016, Nuclear Installations Act 1965, and ISO 14001 EMS compliance. The Tritium Plant is the largest tritium atmospheric discharge point on site and therefore the primary subject of environmental permitting conditions; without this subsystem decomposition, the regulatory obligations identified in SYS-REQ-019 have no verifiable owner at subsystem level.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Inspection">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; tritium-plant; regulatory; session-553; idempotency:sub-tritiumplant-env-permit-553">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-083" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-083">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Tritium Plant SHALL implement N+1 process module redundancy for all active tritium processing stages — isotope separation, tritium purification, and storage vessel management — such that failure of any single active process module maintains tritium fuel throughput at not less than 50% of rated capacity (100 Pa·m³/s D-T equivalent), sufficient to sustain plasma operations at reduced duty cycle and prevent unplanned plasma shutdown due to fuel starvation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="UHT classifies tritium plant as System-Essential (bit 16), indicating a single failure stops the entire system. The 50% throughput floor is derived from minimum plasma Q-value operation requirements: D-T fuel delivery below 50% cannot sustain ignition at design density. N+1 redundancy at module level is preferred over N+2 due to tritium inventory minimisation constraints — excessive redundant inventory increases radiological hazard without proportional benefit.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; tritium-plant; sil-3; redundancy; session-553; idempotency:sub-tritiumplant-n1-redundancy-553">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-084" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-084">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Superconducting Magnet System SHALL implement a passive quench energy absorption architecture such that failure of any single active quench detection channel does not result in magnet winding damage, with passive architecture verified by analysis to safely absorb 100% of total stored magnetic energy (≥10 GJ nominal) within the energy dump resistor network without requiring active triggering, and with quench protection remaining functional following any single hardware failure in the protection logic.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="UHT classifies superconducting magnet system as System-Essential (bit 16); a magnet quench cascade is DBA scenario (c) in SYS-REQ-018. The existing SUB-REQ-074 addresses N+1 for the power supply converters but does not cover quench protection redundancy at the system level. The passive energy absorption requirement eliminates the need for active triggering as the primary mitigation, reducing reliance on detection latency and providing defence-in-depth against single-channel detection failure.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Analysis">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; superconducting-magnet-system; sil-2; redundancy; dba; session-553; idempotency:sub-sms-passive-quench-protection-553">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SUB-REQ-085" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-085">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Superconducting Magnet System TF Coil Set conductor SHALL use cable-in-conduit conductor (CICC) technology fabricated from Nb3Sn superconducting strands with critical current density not less than 700 A/mm² at 12 T and 4.5 K in the cabled configuration, and the coil winding pack SHALL withstand a minimum of 60,000 electromagnetic load cycles over the plant operational lifetime without conductor degradation exceeding 5% critical current reduction from beginning-of-life values.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="UHT classifies coil set as Synthetic (bit 2) and Physical Medium (bit 7), flagging absence of material specification requirements. Nb3Sn CICC is the only commercially qualified superconductor meeting the toroidal field requirement at STEP bore dimensions. The 700 A/mm² floor at 12T/4.5K is derived from field-on-axis and coil geometry analysis; without minimum critical current density, TF coil performance cannot be verified against SUB-REQ-025. The 60,000 cycle fatigue limit corresponds to 40-year plant life at 4 plasma pulses per day.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; superconducting-magnet-system; coil-set; material; session-553; idempotency:sub-sms-coilset-material-553">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SYS-REQ-001" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-001">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL sustain deuterium-tritium plasma burn at fusion gain Q ≥ 5 for pulse durations of 2 to 8 hours with plasma current ≥ 10 MA.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Derives from STK-REQ-009 (net 100 MW to grid) and mission statement. Q≥5 is the minimum gain to produce ~500 MW fusion power from ~100 MW auxiliary heating, yielding ~100 MW net after recirculating power. Pulse duration drives energy yield per campaign.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; plasma; session-506; idempotency:sys-plasma-burn-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SYS-REQ-002" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-002">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL convert fusion thermal power to net electrical output of ≥ 100 MW at the 400 kV grid connection point with a gross-to-net efficiency ≥ 25%.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Derives from STK-REQ-009. ~500 MW fusion thermal power requires ~33% gross thermal efficiency to yield ~165 MW gross; after ~65 MW recirculating power for magnets, heating, and auxiliaries, ≥100 MW net is delivered. 25% gross-to-net accounts for all parasitic loads.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; power; session-506; idempotency:sys-power-conversion-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SYS-REQ-003" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-003">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL achieve a tritium breeding ratio (TBR) ≥ 1.1 measured across the breeding blanket, producing net bred tritium at a rate exceeding DT fuel consumption by ≥ 10% to accumulate a reserve inventory of ≥ 1 kg tritium within 12 months of full-power operation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="TBR ≥ 1.1 means 10% excess production over consumption rate. At planned 500 MW fusion power with 50% availability, annual DT consumption is ~4 kg T; 10% surplus yields ~400 g/year reserve accumulation, reaching ≥1 kg within 3 years. The 1 kg reserve provides 2-3 month fuel buffer against breeding blanket underperformance. The original text said 'sufficient tritium' which is non-measurable; this revision specifies both the rate and target inventory. Revised in validation session 519 to address AmbiguityBlacklist finding.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; tritium; session-506; idempotency:sys-tbr-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SYS-REQ-004" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-004">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="When a plasma disruption is detected, the STEP Fusion Power Plant SHALL initiate disruption mitigation (shattered pellet injection or massive gas injection) within 10 ms and limit thermal loads on the first wall to ≤ 0.5 MJ/m².">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Derives from STK-REQ-002, addresses H-001 (SIL 3). 10 ms response time is driven by thermal quench timescale of ~1 ms; mitigation must be initiated during the pre-thermal-quench phase. 0.5 MJ/m² is the tungsten damage threshold for single events.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="rt-resolved-session-531">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SYS-REQ-005" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-005">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL confine all tritium within at least two independent containment barriers under nominal operating, anticipated transient, and design basis accident conditions, limiting any single-event release to &lt; 0.1 g tritium.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Derives from STK-REQ-001 and STK-REQ-003, addresses H-002 (SIL-3 tritium release). 0.1 g single-event limit derives from UK nuclear site licence conditions and ONR regulatory guides for fusion: at this inventory level, atmospheric dispersion models show ground-level concentration at the site boundary remains below 1% of the occupational exposure limit. Two-barrier requirement derives from nuclear containment principles. 'Nominal operating, anticipated transient, and design basis accident' replaces ambiguous 'normal' to comply with ISO 29148 unambiguous language requirement; updated validation session 520.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="rt-resolved-session-531">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SYS-REQ-006" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-006">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL detect and safely manage superconducting magnet quench events by discharging stored magnetic energy (up to 50 GJ) to dump resistors within 30 seconds, limiting hot-spot temperature to &lt; 300 K.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Derives from STK-REQ-003, addresses H-003 (SIL 2). 50 GJ stored energy in HTS magnets must be extracted before conductor damage occurs; 300 K hot-spot limit prevents irreversible degradation of HTS tape. 30s discharge time balances voltage limits against thermal margin.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="rt-resolved-session-531">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SYS-REQ-007" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-007">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL remove decay heat from in-vessel components passively (without active pumping) for at least 72 hours following loss of all AC power, maintaining structural temperatures below design limits.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Passive decay heat removal is safety-critical (SIL-2, hazard H-004 LOCA). VER-REQ-093 specifies physical Test on a full-scale passive decay heat removal test rig. Analysis alone cannot account for as-built thermal resistance, fouling, or water chemistry effects on natural circulation. IEC 61508 SIL-2 requires Test verification for this failure mode. Changed from Analysis to Test in validation session 520 to resolve quality gate blocker.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; safety; sil-2; session-506; idempotency:sys-passive-decay-heat-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SYS-REQ-008" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-008">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL maintain ultra-high vacuum (&lt; 1×10⁻⁶ Pa) in the plasma vessel with a total leak rate &lt; 1×10⁻⁹ Pa·m³/s per seal during all operational modes.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Derives from vacuum constraints and STK-REQ-001 (plasma operation). Impurity ingress from leaks poisons the plasma and triggers disruptions; 1e-6 Pa base pressure is required for plasma breakdown and burn purity.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; vacuum; session-506; idempotency:sys-vacuum-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SYS-REQ-009" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-009">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL provide a remote handling system capable of replacing all in-vessel components within a 4-month maintenance campaign, with component positioning accuracy ≤ 2 mm.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Derives from STK-REQ-005, STK-REQ-006. 4-month campaign duration drives 50% plant availability target. 2 mm positioning accuracy is required for divertor cassette alignment to magnetic field geometry and coolant seal engagement.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; remote-handling; session-506; idempotency:sys-remote-handling-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SYS-REQ-010" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-010">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL achieve ≥ 50% operational availability over a 6-month campaign, defined as burn-hours divided by calendar-hours excluding planned maintenance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Derives from STK-REQ-009 and operational tempo constraint. 50% availability with 100 MW net output yields ~440 GWh per year, demonstrating economic relevance. Availability is limited by inter-pulse turnaround (30 min–4 hr) and unplanned downtime.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Analysis">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; performance; session-506; idempotency:sys-availability-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SYS-REQ-011" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-011">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="When ground acceleration exceeds 0.1g (OBE threshold), the STEP Fusion Power Plant SHALL initiate plasma shutdown within 100 ms of seismic trigger signal receipt and transition all subsystems to seismically-safe states within 10 seconds.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SIL-3 seismic trip requirement. 100 ms shutdown window is set by maximum halo current exposure duration before structural damage to in-vessel components; beyond 100 ms, asymmetric disruption loads exceed design basis. 10 second full subsystem safe-state transition covers magnet hold current reduction, tritium confinement isolation, and vacuum system standby mode. Removed the adjective 'fast' (ambiguous) as the 100 ms bound is self-defining; added explicit 10-second subsystem transition bound absent from original. Revised in validation session 519.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; safety; sil-3; session-506; idempotency:sys-seismic-trip-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SYS-REQ-012" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-012">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL limit neutron streaming through all penetrations such that dose rates in occupied areas remain below 10 µSv/hr during full-power operation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Neutron streaming dose rate must be measured in-situ at full-power operation; MCNP analysis cannot fully account for as-built penetration tolerances, cable routing gaps, and local shielding variations. VER-REQ-095 specifies calibrated dosimetry measurement at all occupied area boundaries during full-power plasma. Changed from Analysis to Test in validation session 520 to resolve quality gate blocker and meet IEC 61508 SIL-1 requirements for occupied area radiation protection.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; safety; sil-1; session-506; idempotency:sys-neutron-shielding-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SYS-REQ-013" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-013">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL provide ≥ 40 plasma diagnostic systems with calibrated, time-synchronised measurements (timing accuracy ≤ 1 µs) covering magnetic, kinetic, and spectroscopic parameters.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Derives from STK-REQ-017. 40 diagnostic systems is the minimum for comprehensive plasma characterisation of a burning DT plasma; 1 µs synchronisation enables correlation of fast MHD events across diagnostic channels.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; diagnostics; session-506; idempotency:sys-diagnostics-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SYS-REQ-014" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-014">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL be designed such that ≥ 80% of decommissioning waste by volume is classifiable as LLW within 100 years of final shutdown through use of reduced-activation materials.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Derives from STK-REQ-019, STK-REQ-020. Reduced-activation ferritic-martensitic steels (e.g., EUROFER) and tungsten selection at design stage determines activation products and decay timescales. 80% LLW target minimises ILW storage burden.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Analysis">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; decommissioning; session-506; idempotency:sys-decom-waste-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SYS-REQ-015" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-015">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL comply with Grid Code requirements for power quality, delivering electricity at 400 kV ± 5%, 50 Hz ± 0.5 Hz, with harmonic distortion &lt; 3% THD.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Derives from STK-REQ-009. Grid Code compliance is mandatory for connection; voltage and frequency tolerances are National Grid ESO standard requirements; THD limit prevents interference with other grid users.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="100">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; power; session-506; idempotency:sys-grid-quality-506">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-043" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-016">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL implement radiobiological protection measures such that occupational whole-body dose to any worker does not exceed 1 mSv/year above background in designated supervised areas, and the plant SHALL maintain ALARA (As Low As Reasonably Achievable) dose management in accordance with UK IRR 2017 and ONR nuclear site licence conditions, documented in an approved Radiation Protection Supervisors programme.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="A fusion power plant generates neutron activation products and tritium, creating radiobiological hazards to workers and the public. UK law requires compliance with IRR 2017 and ONR site licence conditions. The 1 mSv/year limit (above background) is the HSE-recommended constraint for designated areas at nuclear facilities. This requirement flows from STK-REQ-003 (safety assessment principles), STK-REQ-004 (tritium accountability), and the Biological/Biomimetic ontological trait assigned to the STEP system entity reflecting biological dose considerations.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Analysis">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:sys-radiobio-protection-516">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SYS-REQ-017" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-017">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL provide 24-hour advance notification to National Grid of planned generation schedule changes exceeding 10 MW, and SHALL notify within 15 minutes of any unplanned generation interruption affecting grid frequency response obligations.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-010 mandates 24-hour advance notification; no SYS requirement currently implements this stakeholder need. UK Grid Code CC.6.3.2 requires mandatory advance notice for scheduled plant outages. The 15-minute unplanned interruption notification is derived from National Grid's Balancing and Settlement Code and Grid Code requirements for frequency response obligations: a delay beyond 15 minutes may trigger Grid Code non-compliance penalties and affect National Grid's ability to dispatch balancing mechanisms.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; grid; grid-code; session-552; idempotency:sys-grid-notification-24h-552">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SYS-REQ-018" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-018">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL define a Design Basis Accident set encompassing at least: (a) maximum credible tritium release, (b) tokamak in-vessel component failure with delayed ex-vessel rupture, (c) superconducting magnet quench cascade, and (d) loss-of-cooling to decay heat removal system; and SHALL demonstrate in the Nuclear Safety Case that each DBA does not exceed the Basic Safety Level dose limits of 1 mSv effective dose to any member of the public.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-003 requires demonstration of a deterministic nuclear safety case using Design Basis Accidents and basic safety levels; no SYS requirement currently decomposes this. The four DBA categories represent the STEP-specific risk inventory: tritium release is the primary radiological source term; in-vessel component failure is the primary structural hazard; magnet quench cascade is the primary energy release event; and loss of decay heat cooling is the primary post-shutdown hazard. The 1 mSv DBA dose limit is derived from IAEA SSR-2/1 and ONR technical assessment guide NS-TAST-GD-005 for near-field nuclear installations.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Analysis">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; safety; sil-3; dba; session-552; idempotency:sys-dba-basic-safety-level-552">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SYS-REQ-019" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-019">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL obtain and maintain all required environmental permits under the Environmental Permitting (England and Wales) Regulations 2016 and the Nuclear Installations Act 1965, and SHALL demonstrate continuous compliance by maintaining a certified Environmental Management System conforming to ISO 14001 with annual third-party audit.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-013 mandates compliance with environmental permitting regulations; no SYS requirement currently implements this. Environmental Permitting (England and Wales) Regulations 2016 apply to all nuclear sites discharging radioactive substances to the environment; compliance is a condition of the ONR nuclear site licence. ISO 14001 certification provides an independent, internationally recognised framework for ongoing environmental compliance management. Annual third-party audit is the minimum frequency required by ONR guidance for nuclear site environmental management systems.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Inspection">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; environmental; regulatory; session-552; idempotency:sys-env-permitting-iso14001-552">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:SYS-REQ-020" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-020">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The STEP Fusion Power Plant SHALL publish processed plasma physics diagnostic data to the fusion research community data repository within 30 days of each experimental campaign completion, in conformance with FAIR data principles (Findable, Accessible, Interoperable, Reusable).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-017 mandates data sharing within 30 days; no SYS requirement implements this. STEP is a publicly funded programme with open-science obligations under UKRI data management policy. The 30-day window is the STK-stated constraint derived from the UK Research and Innovation open data requirements for nationally significant science infrastructure. FAIR data principles are the international standard for scientific data interoperability, adopted by EUROfusion and mandatory for fusion science facilities receiving EU/UK public funding.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Inspection">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; research; data; session-552; idempotency:sys-research-data-30days-552">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-001" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-001">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-001: Conduct static magnetic field measurement at plasma centre with Hall probe array. Confirm toroidal field 3-4T ± 0.1T. Measure field ripple across plasma volume, verify &lt; 1%. Apply 100 MN lateral load via hydraulic test rig to gravity support structure, confirm no plastic deformation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This interface carries both electromagnetic and structural loads. Direct measurement of field strength and ripple is needed to confirm confinement quality per IFC-REQ-001. Structural load test must be performed before first plasma operation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; tokamak; magnet; session-507; idempotency:ver-ifc001-507">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-002" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-002">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-002: Conduct integrated cryogenic acceptance test at full magnet load. Confirm steady-state helium flow rate at transfer line inlet, measure supply temperature ≤ 4.5 K and pressure 3-5 bar. Confirm quench valve response time &lt; 100 ms by simulated quench signal. Monitor coil temperature rise during simulated quench, confirm ≤ 5 K overshoot.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Cryogenic interface failure is the initiator for H-003 (magnet quench). Acceptance test at full cryogenic load before magnet energisation provides evidence that IFC-REQ-002 flow and temperature parameters are met and quench protection operates within timing budget.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; cryo; magnet; session-507; idempotency:ver-ifc002-507">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-003" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-003">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-003: Characterise pellet injection system on test stand, confirm pellet velocity 100-1000 m/s by time-of-flight measurement across 2 m diagnostic section. Confirm ice pellet integrity at plasma entry via optical diagnostics. Measure exhaust duct conductance with calibrated gas flow, verify pump throughput handles T+He exhaust at 10-100 Pa during burn.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Pellet injection velocity determines fuel deposition depth in plasma; failure to meet IFC-REQ-003 limits would result in surface fuelling instead of core fuelling, degrading plasma performance and TBR. Exhaust duct test confirms tritium plant can process divertor gas load.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; tritium; tokamak; session-507; idempotency:ver-ifc003-507">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-004" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-004">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-004: During integrated commissioning at rated power, measure primary coolant inlet/outlet temperatures at blanket and divertor circuits. Confirm outlet temperature ≥ 500°C and inlet ≤ 300°C. Measure total thermal power via calorimetric balance, verify ≥ 500 MW transferred to power conversion system within ±5%.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Thermal interface compliance is the direct evidence that SYS-REQ-002 net electrical output is achievable. Primary coolant temperature and flow rate measurements at full fusion power provide the ground truth for the heat balance. Failure to achieve 500 MW thermal transfer would make 100 MW net electrical output unachievable.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; tokamak; power-conversion; session-507; idempotency:ver-ifc004-507">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-005" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-005">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-005: Inject calibrated test signals to all 40+ diagnostic sensor inputs. Confirm data arrives at PCS controller within 1 ms end-to-end (measured by timestamped packet capture). Exercise all actuator command outputs (gas puff valve, pellet injector, disruption mitigation), confirm command delivery latency ≤ 1 ms under simultaneous full-sensor-rate load.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="1 ms latency drives the controller sampling loop: disruption precursor signals at 1 kHz must complete sensing→processing→actuation within one sample period. Exceeding this budget means the PCS cannot execute the disruption mitigation response required by SYS-REQ-004 within the 10 ms window.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; plasma-control; tokamak; session-507; idempotency:ver-ifc005-507">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-006" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-006">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-006: Command step changes in coil current setpoints on each power supply channel. Measure current regulation accuracy under full thermal load at 4.5 K, confirm within 0.1% of setpoint. Measure response time from command issue to 90% of setpoint current, confirm at or below 10 ms. Test across full operational range of plasma position and shape control scenarios.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Current regulation accuracy and response time directly set the bandwidth of the plasma position and shape control loop. 0.1% accuracy and 10 ms response are derived from plasma equilibrium sensitivity analysis: larger errors or slower response lead to locked modes and disruptions (H-001).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; plasma-control; magnet; session-507; idempotency:ver-ifc006-507">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-007" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-007">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-007: Evacuate the plasma vessel from atmospheric pressure. Measure base pressure by calibrated ionisation gauge after 72-hour pump-down. Confirm base pressure below 1e-6 Pa. Measure effective pumping speed for deuterium by injection-throughput method, confirm at or above 50 m3/s. During a simulated burn pulse inject helium ash at representative rate, confirm system maintains pressure within operational band.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Base pressure below 1e-6 Pa is required for plasma initiation by ECR breakdown. Effective pumping speed of 50 m3/s is derived from the helium ash production rate at rated fusion power and the requirement that helium concentration in the plasma remains below 5% to avoid fuel dilution. Failure would prevent plasma startup.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; vacuum; tokamak; session-507; idempotency:ver-ifc007-507">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-008" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-008">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-008: Perform dimensional survey of all horizontal and vertical port clear bores. Confirm at least 4 horizontal and 2 vertical ports meet 1.5 m minimum clear bore. Conduct load trial inserting a representative cassette dummy (10-tonne) through each port type using the remote handling system. Confirm successful insertion, manipulation, and extraction without snagging.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Port clear bore and load capacity are fundamental to the remote maintenance campaign duration (STK-REQ-006). If any port fails to meet 1.5 m bore, the remote handling tool design is invalidated and the maintenance schedule cannot be achieved. Demonstration with full-scale dummy validates the physical interface before activation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; remote-handling; tokamak; session-507; idempotency:ver-ifc008-507">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-009" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-009">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-009: During sustained full-power operation, measure active power export at grid connection point. Confirm at least 100 MW delivered at 400 kV and 50 Hz. Measure power factor, confirm 0.95 or above. Measure total harmonic distortion, confirm below 3% THD. Simulate grid fault as per Grid Code CC.6.3, confirm fault ride-through without disconnection.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Grid export parameters are contractual with the Grid Transmission Operator and regulatory. 100 MW at rated power quality is the primary mission performance metric. Fault ride-through test is required by ONR and the grid connection agreement prior to commercial operation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; power-conversion; grid; session-507; idempotency:ver-ifc009-507">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-010" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-010">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-001: Run the PCS control loop on the production hardware with all 40+ diagnostic channels active at 1 kHz injection rate. Instrument the control loop with hardware timestamping at input and output. Collect 10000 consecutive cycles. Confirm 99.9% of cycles complete within 1 ms. Confirm no cycle exceeds 1 ms by more than 100 microseconds.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Hardware-in-the-loop test on production controller under realistic load is the only reliable way to verify real-time timing compliance. Software simulation cannot capture NUMA cache effects, OS jitter, or PCIe interrupt latency that determine worst-case cycle time on the target hardware.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; plasma-control; session-507; sil-3; idempotency:ver-sub001-507">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-011" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-011">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-002: Replay the full ITER/JET/MAST disruption database (at least 5000 disruptive events) through the PCS detection algorithm on hardware-in-the-loop test bench. Measure detection rate and time-to-trigger. Confirm detection probability of 0.99 or greater. Confirm 99th percentile trigger latency at or below 10 ms from threshold crossing. Confirm 0 false positive triggers in 1000 non-disruptive reference pulses.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Detection probability of 0.99 is a SIL-3 safety function target. Database replay is the accepted verification method for disruption prediction algorithms (per ITER CODAC standards) because controlled plasma disruptions cannot be deliberately induced on STEP for testing. The false positive criterion prevents spurious mitigation triggers that would waste divertor components.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; plasma-control; session-507; sil-3; idempotency:ver-sub002-507">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-012" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-012">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-005: In integrated commissioning, inject simulated controller fault signals (watchdog timeout, data loss, hardware alarm) while plasma is sustained in H-mode at intermediate power. Confirm the PCS initiates gas injection for plasma termination within 1 s of fault detection. Confirm plasma current reaches zero within 30 s. Confirm no disruption (no thermal quench signature on first-wall calorimeters).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SIL-3 safety function (IEC 61508): safe-state initiation on PCS internal fault must be verified by Test, not Demonstration. A repeatable, instrumented test with recorded stimuli (fault injection), measured response times, and documented pass/fail criteria is required for regulatory sign-off. The existing procedure (fault injection while plasma is sustained, measure gas injection timing and plasma current extinction within 30 s) constitutes a Test — the method label is corrected accordingly.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; plasma-control; session-507; sil-3; idempotency:ver-sub005-507">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-013" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-013">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify end-to-end plasma control: from disruption precursor signal injection at the Diagnostic Data Acquisition Front-End through the Real-Time Plasma Controller equilibrium reconstruction, through the Disruption Prediction and Mitigation Unit threshold assessment, to shattered pellet injection command at the Actuator Management System output, the total latency SHALL be demonstrated at or below 10 ms under peak diagnostic load (all 40 channels at 1 kHz) at rated plasma conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="System-level integration test for the SIL-3 disruption mitigation chain. Individual component tests of SUB-REQ-001 and SUB-REQ-002 verify subsystem behaviour; this end-to-end test verifies that the chain of interfaces IFC-REQ-005 and the internal PCS data path together meet the 10 ms SYS-REQ-004 system requirement under combined load.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="86">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; plasma-control; integration; session-507; sil-3; idempotency:ver-e2e-pcs-507">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-021" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-014">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-006: On a dedicated material injection test bench, fire the massive material injection system with instrumented shattered pellet configuration. Measure total hydrogenic atom delivery, verify 10e22 atom minimum delivery within 50 ms of trigger signal, repeat 100 firings to establish statistical injection reliability.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="10e22 atoms in 50 ms is a SIL-3 safety function for runaway electron suppression (H-006). Bench test on the production injection system is required because in-vessel testing during actual disruptions is not feasible: the injection parameters must be characterised and qualified before first plasma.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-sub006-508">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-020" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-015">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-004: Inject synchronised calibrated pulses to all diagnostic front-end channels simultaneously from a common reference source. Measure timestamp skew between channels across 10000 pulse bursts. Confirm 1 kHz sample rate and skew below 1 microsecond in all cases.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="1 microsecond synchronisation is a SIL-3 data integrity requirement for equilibrium reconstruction. Hardware injection of known-phase pulses is the only reliable method to measure actual timestamping latency including interrupt service routines and PCIe transfer time, which simulation cannot capture.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-sub004-508">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-019" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-016">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-003: Inject a simulated primary controller fault (software halt) during closed-loop plasma simulation. Confirm standby controller assumes control within 500 ms with no simulated plasma position excursion exceeding 5 cm, repeated 20 times with zero failures.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Updated from Demonstration to Test: SUB-REQ-003 is SIL-3 (controller redundancy claim for disruption mitigation chain). The 20-repetition protocol with quantified pass/fail criteria (500ms switchover, 5cm excursion limit, zero failures) meets the Test standard under IEC 61508. Demonstration understates the rigour of this verification procedure.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-sub003-508">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-022" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-017">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-007: During integrated commissioning at stepped-up fusion power, measure divertor target surface heat flux with embedded thermocouples and infrared camera at each power step up to rated power. Confirm peak divertor heat flux does not exceed 10 MW/m2 at rated Q=5. Inspect tungsten tile surface condition after 100 full-power plasma pulses.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="In-situ measurement is required because heat flux distribution depends on plasma shape and edge transport which cannot be predicted with sufficient accuracy for this safety-critical acceptance criterion. Tungsten erosion inspection after 100 pulses provides the basis for extrapolating to the 1 mm/year limit over the campaign.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-sub007-508">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-023" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-018">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-008: Energise TF coil set to rated current on a coil test facility. Measure on-axis field with calibrated Hall probe array and compute field ripple by Fourier analysis of the poloidal variation. Initiate quench by heater injection, confirm quench detection within 100 ms and energy extraction initiation within 200 ms by oscillograph trace.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Full-current magnet test is required to verify both field uniformity and quench protection timing as SYS-REQ-006 safety functions. Heater-induced quench is the accepted commissioning test method for superconducting magnets; testing at full stored energy (50 GJ) in the final configuration is needed for sign-off.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-sub008-508">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-025" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-019">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-010: During integrated commissioning, process a known tritium inventory through the full CECE detritiation system and measure input and output activity concentrations. Confirm detritiation factor 1e6 or greater. Conduct 30-day material balance period and confirm tritium accountancy closure to within plus or minus 1 g.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Detritiation factor and accountancy are regulatory requirements (STK-REQ-013, STK-REQ-004). Integrated commissioning test on the full production system is required because detritiation factor depends on CECE column loading and interface conditions not replicable on sub-scale test rigs.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-sub010-508">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-024" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-020">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-009: During cold commissioning, operate each cold box train independently at full cryoplant load. Confirm 4.5 K magnet temperature and stability within plus or minus 0.1 K over a 48-hour steady-state test. Demonstrate load transfer between cold box trains within 10 minutes of simulated cold box fault with no magnet temperature excursion above 4.8 K.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="48-hour steady-state test at full load is the accepted factory acceptance test for helium refrigerators of this class. 4.8 K maximum during switchover corresponds to 90% of the HTS current-sharing temperature margin, ensuring no quench risk during the transition.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-sub009-508">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-026" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-021">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-011: During sustained full-power plasma operation at rated Q=5, measure net electrical export at the 400 kV grid connection point averaged over 6-hour burn pulse. Confirm 100 MW or greater net output and compute gross-to-net efficiency from turbine heat input and net export metering. Analyse 6-month campaign generation availability from operational log data.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Net electrical output and efficiency are the primary commercial performance metrics (SYS-REQ-002). Measurement at the grid connection point during actual sustained plasma operation is the only valid method: auxiliary loads vary with plasma conditions and cannot be accurately modelled without operational data.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-sub011-508">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-028" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-022">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-012: On a full-scale remote handling test facility with representative port mock-up, demonstrate complete divertor cassette replacement sequence from start to end. Record elapsed time and confirm completion within 21 calendar days. Measure cassette insertion positioning accuracy with laser tracker and confirm 2 mm or better in all axes. Operate manipulators under simulated 0.5 Sv/hr dose field for 500 hours without failure.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Full-scale demonstration on a representative mock-up is required because RHS performance depends on tool stiffness, joint clearances, and visual feedback conditions that cannot be verified on sub-scale or software models alone. 500-hour endurance run is required to validate the MTBF claim before deployment in the radioactive environment.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-sub012-508">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-027" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-023">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-013: After vessel bake-out, measure base pressure in the plasma vessel using calibrated ion gauge and residual gas analyser. Confirm pressure below 1e-6 Pa within 24 hours of pump-down start. Measure effective pumping speed from divertor ducts using gas injection conductance method and confirm 50 m3/s or greater at operating pressure.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Base pressure measurement by calibrated ion gauge is the primary vacuum acceptance criterion for plasma operation. Pumping speed measurement by gas injection is the ITER-standard method for characterising divertor pumping performance; effective pumping speed cannot be derived from cryopump specifications alone due to duct conductance uncertainties.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-sub013-508">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-030" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-024">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify RPS-SUB: On the as-built plant with all shielding installed, measure dose rates at all zone boundaries using calibrated dose rate meters. Inject simulated high-dose-rate signal to each zone boundary interlock and confirm access prevention response within 100 ms. Confirm zone classification maps match ALARP design target rates.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="In-situ measurement on the as-built plant is required because dose rates depend on as-installed shielding configuration which cannot be verified on design drawings. Interlock response timing test is needed for the SIL classification of the access control function.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-sub-rps-508">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-025" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-025">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-010: During cryogenic commissioning, supply liquid nitrogen to the Tritium Plant process cold boxes at rated mass flow. Measure supply temperature at the inlet manifold. Pass criterion: temperature ≤ 77 K ± 1 K, supply pressure 3.5 ± 0.2 bar sustained for 4 hours.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-010 specifies LN2 supply conditions; this integration test confirms the Cryogenic Plant can maintain those conditions under representative tritium process load, preventing isotope separation column warm-up.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; cryogenic; tritium; session-509; idempotency:ver-ifc010-509">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-026" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-026">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-011: Inject a simulated tritiated exhaust gas flow into the vacuum-tritium interface port at the specified throughput rate. Measure gas flow rate and confirm delivery within the tritium inventory accountability bounds. Pass criterion: throughput ≥ 10 Pa·m³/s, tritium capture efficiency ≥ 99.9%.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-011 specifies exhaust gas transfer; this test confirms the vacuum-tritium interface maintains throughput without tritium escape, which is the basis of the containment safety case.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; vacuum; tritium; session-509; idempotency:ver-ifc011-509">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-027" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-027">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-012: Inject calibrated neutral gas pressure pulses into the divertor baffle region. Confirm that PCS receives pressure reading at the correct digitisation interval. Pass criterion: pressure signal latency &lt; 5 ms, accuracy within ± 5% of injected value across the operating range.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-012 defines the vacuum diagnostics data path to PCS; latency and accuracy are critical because the PCS uses divertor neutral gas pressure to detect MARFE events and trigger plasma density control responses.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; plasma-control; vacuum; session-509; idempotency:ver-ifc012-509">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-028" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-028">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-013: Command pellet injection sequences from PCS to Tritium Plant fuel injector. Measure pellet velocity and injection timing. Pass criterion: pellet velocity 100 to 200 m/s, injection latency under 20 ms from PCS command, 98% injection success rate over 200 commanded injections.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-013 specifies the fuelling command interface; pellet velocity and latency determine fuelling depth and timing relative to ELM phase, directly affecting plasma density control and burn performance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; plasma-control; tritium; session-509; idempotency:ver-ifc013-509">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-029" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-029">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-014: Command step coil current setpoints from PCS to SMS power supplies. Measure current tracking accuracy and response time. Pass criterion: current tracking error under 0.1% rated, setpoint response within 50 ms, quench detection alarm relayed to PCS within 10 ms.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-014 defines the coil power supply command path; tracking accuracy and quench alarm latency determine whether PCS can execute controlled plasma shutdown in response to a magnet event.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; plasma-control; magnet; session-509; idempotency:ver-ifc014-509">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-030" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-030">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-015: Using full-scale mock-up of tritium plant remote handling port, demonstrate remote removal and installation of a representative tritium process component. Pass criterion: task completed without tritium perimeter breach, within maintenance window allocation, using deployed RH tooling without manual intervention.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-015 specifies remote handling compatibility of tritium plant internals; demonstration on a representative mock-up verifies that no manual entry is required, which is mandatory under ALARP and tritium contamination control.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; remote-handling; tritium; session-509; idempotency:ver-ifc015-509">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-031" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-031">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-016: During integrated cryogenic commissioning, operate cryogenic pumping cold heads in vacuum chamber at rated cooling load. Pass criterion: cold head temperature at or below 4.5 K, pumping speed not less than 10^5 L/s for hydrogen, achieved on at least 20 of 24 installed heads simultaneously.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-016 specifies the cryo-vacuum pumping interface; cold head temperature directly determines achievable vacuum pressure — failure to reach 4.5 K prevents the cryo-pumps from achieving the plasma vessel base pressure.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; cryogenic; vacuum; session-509; idempotency:ver-ifc016-509">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-032" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-032">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-017: With RHS deployed in port, assert PCS plasma-active interlock signal. Confirm RHS receives hardwired lockout and logs the event. Pass criterion: lockout asserted within 100 ms of PCS signal, RHS motion arrested within 500 ms, interlock state change logged in both PCS and RHS event logs with timestamps agreeing within 10 ms.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-017 specifies the plasma-RHS safety interlock; the timing requirements prevent RHS tool damage and port contamination if a disruption occurs during maintenance access, making this a SIL-3 safety test.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; plasma-control; remote-handling; safety; sil-3; session-509; idempotency:ver-ifc017-509">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-033" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-033">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-018: During commissioning, supply auxiliary AC power from Power Conversion System to all Tokamak Core Assembly services. Measure supply voltage and frequency at each distribution board. Pass criterion: voltage 415 V +/- 5%, frequency 50 Hz +/- 0.5 Hz, continuity maintained during simulated grid transient of 0.5 s.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-018 specifies TCA auxiliary power; voltage and frequency tolerances must be met to ensure instrumentation, cooling valve actuators, and diagnostic heaters operate within specification during plasma pulses.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; power; tokamak; session-509; idempotency:ver-ifc018-509">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-034" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-034">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-019: During commissioning with grid connection established, measure station auxiliary load drawn from the national grid. Pass criterion: import does not exceed 50 MW, power factor above 0.95 lagging, harmonic distortion below Grid Code limits at the 400 kV connection point.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-019 specifies the station load import limit; exceeding the contracted import capacity triggers grid penalty clauses and may cause voltage sag affecting adjacent grid users.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; power; grid; session-509; idempotency:ver-ifc019-509">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-035" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-035">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-020: Apply vessel bakeout heating at specified power to all first-wall panels while cryogenic services are isolated. Measure wall temperature distribution and total gas desorption. Pass criterion: first-wall temperature reaches 200 +/- 10 degrees C across at least 95% of area, base pressure recovers to 1e-6 Pa or below within 48 hours of bakeout completion.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-020 specifies the bakeout heating interface; uniform heating removes water vapour and hydrocarbons from the first wall, which is a prerequisite for achieving the plasma vessel base vacuum pressure.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; tokamak; cryogenic; vacuum; session-509; idempotency:ver-ifc020-509">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-036" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-036">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-015: After full assembly, conduct helium leak test of vacuum vessel at 1e-8 Pa m3/s sensitivity. Additionally, perform hydrostatic over-pressure test of primary coolant boundary at 1.5x MAWP. Pass criterion: total vessel outgassing rate below 1e-7 Pa m3/s, no coolant-to-vacuum leaks detected, vessel retains structural integrity at 0.75 MPa test pressure.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-015 specifies vessel leak tightness; helium leak testing at commissioning is the only method capable of detecting micro-leaks at the required sensitivity before plasma operations begin.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; tokamak; sil-3; session-509; idempotency:ver-sub015-509">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-037" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-037">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-016: Perform MCNP6 neutronics analysis of as-designed First Wall and Blanket Module using confirmed Li-6 enrichment, validated against tritium production measurements from blanket test modules in ITER. Pass criterion: calculated TBR of 1.1 or greater with Monte Carlo uncertainty below 3%.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-016 specifies blanket TBR; direct measurement requires operating the reactor, so analysis validated by experimental benchmarks is the appropriate and standard verification method for tritium breeding performance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Analysis">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; tokamak; tritium; session-509; idempotency:ver-sub016-509">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-038" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-038">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-017: Run ANSYS electromagnetic analysis of worst-case disruption halo current (10 MA/m) on as-built TCA in-vessel structure FEM model. Confirm by post-disruption vacuum leak check during integrated commissioning. Pass criterion: analysis shows no plastic deformation exceeding allowable stress limits; post-disruption leak rate confirmed below 1e-6 Pa m3/s.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-038 already incorporates a physical Test component: post-disruption vacuum leak check during integrated commissioning (helium leak test confirming vessel integrity after a real or simulated disruption event). ANSYS FEA provides the primary conservatism baseline; the physical leak check is the acceptance Test. For SIL-3 (IEC 61508), the primary verification method must be Test not Analysis. Changed from Analysis to Test in validation session 520 to resolve quality gate blocker silWithoutVer.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; tokamak; sil-3; safety; session-509; idempotency:ver-sub017-509">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-039" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-039">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-018: Test PEPS on a full-scale prototype or equivalent test facility by injecting a calibrated DT+He mixture at 200 Pa m3/s. Measure separation efficiency with mass spectrometry at PEPS outlet. Pass criterion: He content in product below 0.1%, H2O below 1 ppm, throughput sustained for 4 hours at design flow.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Full-throughput test on a representative facility is required because PEPS is SIL 3 and the separation performance cannot be verified by analysis alone. ITER and JET experience shows that real-gas behaviour at high throughput differs from bench-scale predictions. Test must be sustained for 4 hours to verify steady-state performance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; tritium-plant; sil-3; session-510; idempotency:ver-sub-018-510">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-040" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-040">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-022: Inject a calibrated tritium tracer into the Atmosphere Detritiation System test facility atmosphere at 1e-5 Ci/m3. Confirm monitor triggers within 5 seconds of threshold crossing. Confirm recirculation through catalytic beds initiates within 30 seconds. Measure outlet concentration to confirm cleanup factor &gt;= 100 within 4 hours. Pass criterion: all three timing and performance criteria met simultaneously.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Three-criteria pass gate ensures the complete safety function chain is verified: detection, actuation, and performance. SIL 3 classification requires the safety function to be demonstrated under representative conditions rather than by analysis or component-level inspection. Test uses calibrated tracer rather than tritium to manage personnel dose during testing.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; tritium-plant; sil-3; safety; session-510; idempotency:ver-sub-022-510">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-041" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-041">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-021: During integrated commissioning, flow a simulated exhaust stream from PEPS to the ISS feed manifold. Sample the transfer line outlet for He, H2O, and DT concentration using mass spectrometry. Pass criterion: He below 100 ppm, H2O below 1 ppm, transfer line pressure within 1 kPa to 100 kPa, no visible or detected tritium leak from outer line of double-wall assembly.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Interface must be verified at integration level because PEPS and ISS are manufactured as separate modules. The purity and pressure specifications are critical for ISS column performance and cannot be verified by component inspection alone. Double-wall integrity requires an integrated leak test. Derives from IFC-REQ-021.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; tritium-plant; sil-3; session-510; idempotency:ver-ifc-021-510">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-042" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-042">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-022: During fuel cycle commissioning, command an ISS batch product transfer to TSDS. Measure transfer latency from command to product receipt at TSDS inlet manifold. Verify purity of transferred product by mass spectrometry. Pass criterion: latency &lt;= 15 minutes, DT purity &gt; 99.9%, no detectable tritium leak at double-wall buffer vessel joints.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Batch transfer latency and purity are the two operational requirements driving the ISS-TSDS interface design. Integrated test at commissioning is required because buffer vessel performance depends on real thermal and pressure dynamics that cannot be captured in component-level tests. Derives from IFC-REQ-022.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; tritium-plant; sil-3; session-510; idempotency:ver-ifc-022-510">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-043" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-043">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify Tritium Plant end-to-end fuel cycle: During integrated commissioning at partial DT throughput (10% of full power equivalent), demonstrate continuous operation from tokamak exhaust ingestion through PEPS, ISS, TSDS, and return to fueling system for at least 72 hours. Pass criterion: tritium accountancy closure within 1% per 24-hour batch, no abnormal release event, all sub-system performance parameters within design envelopes.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="72-hour continuous demonstration is required to verify the fuel cycle closing property: that bred and recycled tritium is correctly routed through all components without accumulation or loss. This cannot be verified by individual component tests because the fuel cycle is a closed-loop system with time constants of 12-24 hours. The 1% accountancy closure criterion is the SYS-level tritium confinement KPI. Derives from SYS-REQ-005 and STK-REQ-004.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; tritium-plant; sil-3; session-510; idempotency:ver-trp-endtoend-510">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-044" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-044">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-023: On a full-scale SMS test facility, inject a calibrated resistive heater into one coil segment simulating quench onset. Measure detection time from heater activation to AQP board output. Measure dump initiation time. Measure hot-spot temperature via fibre-optic distributed temperature sensor. Pass criterion: detection &lt;= 10 ms, dump initiation &lt;= 50 ms, hot-spot &lt;= 300 K.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Physical injection test on real hardware is required for SIL 2 safety function. Simulation is insufficient because the quench detection algorithm must be verified against the actual electrical and thermal behaviour of the Nb3Sn conductor at 4.5 K. ITER experience shows simulation-only validation has missed quench events caused by conductor non-uniformity.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; superconducting-magnet-system; sil-2; safety; session-510; idempotency:ver-sub-023-510">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-045" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-045">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-025: With TF coils at full current, measure the toroidal field on the plasma axis using a calibrated Hall probe traverse at the midplane. Record field ripple using a 3-axis fluxgate at 12 toroidal positions around the separatrix. Pass criterion: on-axis field 3.2 T ± 0.05 T, ripple &lt; 1% peak-to-peak.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Direct field measurement is the only reliable verification method for magnet performance. Analysis alone cannot capture manufacturing tolerances and coil positioning errors. Hall probe calibration traceable to national standards.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; superconducting-magnet-system; session-511; idempotency:ver-sub-req-025-511">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-046" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-046">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-027: Inject a simulated quench interlock signal and measure the time between signal injection and full opening of all coil current loops (confirmed by Hall-effect current sensors on each bus). Measure coil current decay rate on TF bus. Pass criterion: loop opening &lt; 5 ms, decay rate &lt; 500 A/s throughout discharge.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Active timing test required to verify hardwired SIL-2 response time. Cannot be verified by analysis alone — relay and contactor response times must be measured under load conditions. Test shall be performed at 80% of full coil current to represent realistic stored energy.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; superconducting-magnet-system; session-511; sil-2; idempotency:ver-sub-req-027-511">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-047" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-047">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-025: During TF coil ramp-up test, measure DC bus voltage and current simultaneously using calibrated shunt resistor and Rogowski coil transducer. Confirm IEC 61850 GOOSE message rate and latency using network analyser. Pass criterion: peak current 80 kA ± 0.5%, current measurement accuracy 0.01% FS, GOOSE rate 1 kHz ± 10%.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Interface verification requires measurement of all specified parameters under operational conditions. Rogowski coil accuracy must be validated against a traceable reference since it directly feeds the plasma control loop. GOOSE latency verification confirms deterministic message delivery.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; superconducting-magnet-system; session-511; idempotency:ver-ifc-req-025-511">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-048" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-048">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-026: Apply a calibrated 100 mV sinusoidal signal at 100 Hz to each voltage tap input while coil is at operating current. Measure signal attenuation and phase shift at the QDPS ADC output. Measure input impedance using impedance analyser. Pass criterion: bandwidth at least 1 kHz (-3 dB), input impedance greater than 1 MΩ at operating frequency, galvanic isolation verified by 2 kV hipot test.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Voltage tap bandwidth and impedance are critical quench detection parameters — if bandwidth is insufficient or impedance too low, the resistive quench signature will be attenuated below the 100 mV detection threshold. Hipot test verifies isolation required to prevent coil current diversion through the measurement circuit.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; superconducting-magnet-system; session-511; idempotency:ver-ifc-req-026-511">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-049" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-049">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-029: Following 24-hour vessel bake at 200°C, measure vessel base pressure using calibrated Bayard-Alpert gauge traceable to national standards. During subsequent plasma operations, log vessel pressure at 1 Hz for 30 minutes. Pass criterion: base pressure &lt;= 1e-7 Pa, operational pressure &lt;= 1e-6 Pa throughout plasma phase.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Direct vacuum measurement is the only reliable method to verify pumping performance. Calibrated gauge with traceable calibration is required because impurity partial pressures are calculated from total pressure and require accurate absolute measurement.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; vacuum-system; session-511; idempotency:ver-sub-req-029-511">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-050" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-050">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-031: Operate Cryogenic Plant with one cold box train isolated. Measure total available refrigeration at 4.5K using calibrated flow calorimetry over a 4-hour steady-state run. Pass criterion: ≥ 8 kW at 4.5K with magnet temperature stable within ± 0.2K.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Single-train failure mode test is the acceptance criterion for SIL-2 redundancy requirement. Calorimetric measurement is the only traceable method for verifying 4.5K refrigeration capacity.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; cryogenic-plant; session-513; idempotency:ver-sub-031-513">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-051" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-051">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-032: Simulate a full magnet quench by injecting 200 m³ STP nitrogen (as safe surrogate) into the HMS recovery circuit. Measure fraction of gas captured and purified to ≥99.999% within 2 hours by inline gas chromatography. Pass criterion: ≥95% of injected volume recovered and purified within 2 hours.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Nitrogen surrogate is used for commissioning safety — actual helium quench cannot be induced safely at full scale during acceptance testing. Equivalence has been demonstrated at LHC cryoplant and ITER partial cold tests.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; cryogenic-plant; session-513; idempotency:ver-sub-032-513">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-052" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-052">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-033: Measure static heat load on the installed transfer line network at 4.5K via residual gas analysis and calorimetry after 24-hour steady cold-hold, before magnet cooldown. Pass criterion: total heat ingress ≤ 500 W across all 4.5K lines, with no segment exceeding 10 W/m at rated length.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Static heat ingress measurement prior to magnet cool-down eliminates the magnet heat load contribution, allowing precise isolation of transfer line performance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; cryogenic-plant; session-513; idempotency:ver-sub-033-513">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-053" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-053">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-034: Execute automated cool-down sequence from 300K to 4.5K with production CCS software and instrumentation. Record temperature gradient at all winding pack sensor positions at 1-minute intervals. Pass criterion: no 1-minute gradient exceeds 5K/hour at any winding pack sensor, and cool-down completes within 72 hours.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Thermal gradient acceptance test must be performed with production control software to validate the actual cool-down algorithm, not a simulation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; cryogenic-plant; session-513; idempotency:ver-sub-034-513">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-054" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-054">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-035: Inject a simulated PLC watchdog timeout fault in the production CCS hardware. Measure elapsed time from fault injection to: helium isolation valve closure, vent valve open to HMS, and quench-interlock signal on SMS interface. Pass criterion: all three actions completed within 10 seconds.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Safe state timing verification must be performed on production hardware to capture actual relay response times and I/O scan latency; simulation cannot validate SIL-2 timing requirements.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; cryogenic-plant; sil-2; session-513; idempotency:ver-sub-035-513">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-055" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-055">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-028: During integrated cryogenic cold commissioning, measure HRS-CTLN interface conditions with calibrated PT-100s and pressure transducers at bayonet coupling outlets. Pass criterion: temperature 4.5K ± 0.2K, pressure 3 bar ± 0.1 bar, flow ≥ 40 g/s per train over a 2-hour steady-state run.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Interface acceptance test verifies both HRS output performance and CTLN connector integrity at rated conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; cryogenic-plant; session-513; idempotency:ver-ifc-028-513">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-056" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-056">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-029: Inject step setpoint changes to HRS via CCS fieldbus and measure round-trip command latency with network analyser. Disconnect fieldbus mid-sequence and verify hardwired e-stop actuates within 1 scan cycle. Pass criteria: scan cycle ≤ 100 ms; e-stop activation independent of fieldbus state.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Tests both normal-operation bandwidth and the SIL-2 independence of the safety channel; the two pass criteria are mutually independent and must both be satisfied.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; cryogenic-plant; session-513; idempotency:ver-ifc-029-513">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-057" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-057">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-030: During post-quench recovery test, measure helium gas supply pressure and purity at the HMS-HRS connection point using a calibrated pressure gauge and gas chromatograph. Pass criteria: pressure 200 bar ± 5 bar; purity ≥ 99.999%; refill of 5,000L dewar equivalent buffer completed within 4 hours.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Confirms HMS output meets HRS compressor inlet specification after a quench event — the highest-stress scenario for the gas supply interface.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; cryogenic-plant; session-513; idempotency:ver-ifc-030-513">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-058" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-058">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-031: Test IVIMM-to-control-suite command interface latency using EtherCAT protocol analyser. Apply sinusoidal position command at 125 Hz over 60-second test sequence. Measure command cycle time (pass: ≤4 ms, 99.9th percentile) and feedback latency (pass: ≤8 ms mean). Repeat under simulated radiation environment using gamma source delivering 10 Gy/hr to fibre-optic cable run.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Direct measurement of the interface constraint under simulated operational conditions. The 125 Hz test frequency exercises the worst-case bandwidth margin. Gamma irradiation of the cable run validates radiation-hardness of the transmission medium without requiring full in-vessel test facility.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; remote-handling-system; sil-1; session-514; idempotency:ver-ifc031-514">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-059" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-059">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-032: Test cask-to-port docking interface on full-scale mockup using mass spectrometer helium leak test per ISO 20485. Leak rate pass criterion: &lt;1×10^-9 Pa·m³/s. Apply 5 kN axial load to port flange via calibrated hydraulic jack and confirm flange deflection &lt;0.2 mm (FEA-derived limit). Perform 20 docking cycles to assess repeatability.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Helium mass spectrometer testing is the industry standard for high-vacuum sealing verification per ISO 20485. 20 docking cycles simulate a 5-year maintenance programme (4 campaigns × 5 dockings). Structural load test must be performed before any in-vessel access to confirm port integrity.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; remote-handling-system; sil-1; session-514; idempotency:ver-ifc032-514">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-060" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-060">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-033: Test in-vessel viewing system video delivery to control suite using network packet capture and hardware timestamp analysis. Measure end-to-end latency from camera sensor exposure trigger to pixel display. Pass: ≤200 ms at 25 fps, ≥1080p resolution, stereo pair synchronisation error ≤5 ms. Conduct under gamma irradiation (100 Gy/hr) for 24-hour duration to verify sustained performance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="End-to-end latency must be measured under radiation to detect dose-induced performance degradation of fibre transceivers and DSP hardware. Stereo synchronisation &lt;5 ms is required for depth perception; higher values cause perceived depth offset exceeding 10 mm, impairing 1 mm positioning capability.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; remote-handling-system; sil-1; session-514; idempotency:ver-ifc033-514">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-061" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-061">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-034: Hydrostatically pressure-test each steam generator tube bundle at 1.5× design pressure (22.5 MPa) for 30 minutes per ASME Boiler and Pressure Vessel Code Section III. Perform helium leak test on each tube at 16 MPa with mass spectrometer; pass criterion: &lt;1×10^-6 Pa·m³/s per tube. Inspect tube-to-tube sheet welds by phased array UT to IIW Category C.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ASME BPVC Section III is the applicable code for nuclear pressure-containing components. Leak testing at commissioning is mandatory before introducing tritiated primary coolant. Per-tube leak rate limit prevents systematic cumulative contamination of the secondary circuit over the plant lifetime.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; power-conversion-system; sil-1; session-514; idempotency:ver-ifc034-514">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-062" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-062">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-035: Commission turbine-generator and measure electrical output at grid connection point during first synchronisation trial. Record power factor, terminal voltage, and frequency at 50%, 75%, and 100% rated load. Pass: 22 kV ±2.5%, power factor 0.85-1.0, transformer losses confirmed &lt;0.5% of rated MVA by heat run test per IEC 60076-1 Method B.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Grid code compliance and transformer efficiency must be verified at commissioning before commercial operation begins. The heat run test is the IEC 60076-1 standard for confirming transformer loss guarantees and is a contractual requirement for National Grid connection agreement.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="rt-resolved-session-531">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-063" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-063">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-036: Test disruption notification interface by injecting test signal at PCS signal source and measuring time to turbine runback initiation using calibrated digital oscilloscope. Inject 100 test events at random intervals. Pass: 99th percentile latency ≤100 ms, zero missed events. Verify signal independence from network by disconnecting plant SCADA network during test.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The 100-event statistical test provides confidence that the hardwired relay meets the &lt;100 ms latency requirement in the presence of contact bounce, relay delays, and cable capacitance. SCADA disconnection test confirms the interlock operates independently as required. Missed events would directly degrade operational availability by causing turbine trips per disruption event.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; power-conversion-system; sil-1; session-514; idempotency:ver-ifc036-514">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-064" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-064">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-036: Position IVIMM end-effector to 50 calibrated target positions distributed across the vessel workspace using laser tracker reference (Leica AT960 or equivalent). Measure positioning error at each point. Pass: 95th percentile error ≤1 mm, maximum error ≤2 mm. Repeat after 30-minute thermal soak at 150°C. Pass criterion unchanged.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Laser tracker provides traceable reference measurement at 10 μm accuracy, orders of magnitude better than the 1 mm requirement, eliminating measurement uncertainty from the assessment. 50-point distribution covers joints at limit and mid-range positions to detect kinematic singularities. Thermal soak test is essential as thermal expansion of the arm structure is the largest single error contributor.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; remote-handling-system; sil-1; session-514; idempotency:ver-sub036-514">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-065" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-065">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-041: During first full-power plasma commissioning run at Q≥5, measure net electrical power at 400 kV metering point (National Measurement Accreditation Service calibrated meters) for minimum 30-minute sustained period. Pass: time-averaged net power ≥100 MW. Repeat at three separate plasma pulses within the commissioning campaign.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Net electrical output can only be demonstrated with actual fusion plasma at rated conditions. Simulated load banks cannot reproduce the plasma heating power profile. Three repeat measurements across different pulses provide statistical confidence and rule out measurement artefacts from any single measurement event.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; power-conversion-system; sil-1; session-514; idempotency:ver-sub041-514">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-066" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-066">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify end-to-end Remote Handling System integration: conduct full blanket module exchange trial on vessel mockup at 1:1 scale, starting from operator receiving task from control suite, through IVIMM manipulation, module extraction, transfer cask loading, transport to hot cell, and installation of replacement module. Pass: complete exchange within 4.5 days per module (90 days / 20 modules), component positioning verified ±1 mm by laser tracker at installation point, no contamination events during transfer (smear surveys pass).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="End-to-end integration testing validates the complete maintenance workflow, which cannot be verified by testing individual components in isolation. The 4.5-day per module pacing is derived from the 90-day campaign target. Smear surveys are the standard radiological contamination check per IAEA RPT-100.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; remote-handling-system; sil-1; session-514; idempotency:ver-rhs-integration-514">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-067" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-067">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify end-to-end Power Conversion System integration: during first plasma commissioning at Q≥5, measure complete energy chain from steam generator primary inlet enthalpy to grid metering point. Record: steam generator duty (MWth), turbine output (MWe), auxiliary load (MWe), net grid export (MWe), and efficiency. Pass: all individual path measurements within ±3% of design, net export ≥100 MW, efficiency ≥25%, frequency 50 Hz ±0.5 Hz, voltage 400 kV ±5%.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The energy chain integration test cannot be completed without actual plasma operation. Individual component tests (steam generator pressure test, turbine runback trial) verify boundary conditions but not overall energy balance. The ±3% measurement tolerance is achievable with calibrated NMAS instrumentation and accounts for thermodynamic averaging over the 30-minute steady state window.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; power-conversion-system; sil-1; session-514; idempotency:ver-pcs-integration-514">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-031" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-068">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-038: Subject representative RHS in-vessel manipulator samples (identical materials and electronics to flight hardware) to a total ionising dose of 1×10^6 Gy using a Co-60 gamma source and neutron irradiation facility (fission spectrum, fluence equivalent to 1×10^6 Gy dose). After irradiation, measure end-effector positioning accuracy on 20 target positions against a laser tracker reference. Pass: positioning error ≤±1.1 mm (no more than 10% degradation of ±1 mm baseline tolerance), all actuators respond to command within specification, no mechanical seizure or insulation breakdown.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Radiation hardening cannot be verified by analysis alone — the combined gamma and neutron environment degrades polymers, lubricants, and electronics in ways that simulation under-predicts. Co-60 plus fission neutron irradiation replicates the D-T plasma environment at 1×10^6 Gy total dose, the cumulative limit in SUB-REQ-038, providing a conservative acceptance gate before in-vessel deployment.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-rhs-rad-hardening-515">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-032" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-069">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-039: Load a Remote Handling Transfer Cask mock-up with a representative activated blanket module specimen (or equivalent gamma source calibrated to match the dose rate of a fully irradiated blanket at end-of-life). Place calibrated gamma survey instruments (Victoreen RO-2 or equivalent, traceable to national standard) at 0.1 m from the outer cask surface at 12 evenly spaced measurement points. Pass: all measured dose rates ≤ 2 mSv/hr, consistent with ISO 2919 sealed source measurement protocol; no single point exceeds 2.5 mSv/hr.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Biological shielding effectiveness of the Transfer Cask in SUB-REQ-039 must be verified against the actual gamma emission spectrum of irradiated blanket material. Analysis using Monte Carlo (MCNP or FLUKA) provides design assurance but cannot account for manufacturing tolerances, shield material density variations, or port geometry. Physical measurement with a calibrated source per ISO 2919 is the regulatory acceptance standard for activated-material transport.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-rhs-cask-shielding-515">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-033" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-070">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-040: On the RHS integration test facility, inject each of five representative fault conditions (loss of position feedback signal, motor overcurrent trip, cable tension alarm, communication timeout, emergency stop activation). Measure: time from fault detection to all-actuator halt using high-speed data logger (1 kHz minimum sample rate); joint drift over a 30-minute hold period with rated payload applied; ability to command manual recovery from halt state. Pass: actuator halt ≤500 ms for all five fault types, joint drift ≤0.5 mm over 30 minutes at rated load, manual recovery commanding succeeds after halt.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="RHS safe-state behaviour in SUB-REQ-040 is safety-critical — a failed halt or joint slip during in-vessel maintenance could damage plasma-facing components or trap activated hardware in the vessel. Hardware-in-the-loop testing at the test facility is the only means to confirm that the ≤500 ms halt requirement and 30-minute load hold are met across all fault pathways, since software timing simulations do not capture hardware actuator latency.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="event">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-rhs-safe-state-515">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-034" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-071">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-043: During commissioning with live 400 kV grid connection, operate the Power Conversion System at rated output and measure at the transmission metering point: voltage (target 400 kV ± 5%), frequency (target 50 Hz ± 0.5 Hz), and total harmonic distortion (THD) using a calibrated power quality analyser (IEC 61000-4-7 Class A). Submit measured data to National Grid ESO for grid code CC.6 compliance sign-off. Pass: all three parameters within limits for a continuous 60-minute steady-state export period, THD &lt; 3%, CUSC connection consent issued.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Grid code compliance for the PCS export interface in SUB-REQ-043 requires witnessed measurement at the actual 400 kV connection point under live grid conditions. Simulation cannot replicate grid impedance interactions that affect harmonic content; compliance requires National Grid ESO sign-off on real measurements as a condition of the Connection and Use of System Code (CUSC) commercial connection agreement.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-pcs-grid-code-515">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-035" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-072">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-044: During first full-power plasma operation at steady-state Q ≥ 5 burn for ≥30 minutes, instrument the primary coolant inlet and outlet of each steam generator module with calibrated resistance thermometers (Pt100, Class A, ±0.15°C) and calibrated flow meters. Compute heat transfer duty from enthalpy balance. Measure secondary steam generator drum pressure and feedwater temperature. Pass: computed primary-to-secondary heat transfer ≥ 500 MWth, primary coolant outlet temperature ≤ 180°C at all steam generator outlet headers, secondary steam quality ≥ 99.5%.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Steam generator thermal performance in SUB-REQ-044 must be verified under actual plasma heating conditions because the primary coolant flow rate and inlet temperature profile are coupled to the tritium breeding blanket thermal response, which cannot be reproduced in isolation. The 180°C primary outlet limit protects blanket structural materials (reduced-activation ferritic-martensitic steel) from creep damage and determines the Rankine cycle thermal input.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-pcs-steam-gen-heat-515">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-036" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-073">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-045: On the Power Conversion System turbine-generator test facility, simulate a plasma disruption signal from the PCS. Inject the hardwired disruption trigger signal and start a stopwatch. Measure turbine load reduction profile from 100% rated load to 20% rated load, recording turbine speed, generator output, and grid voltage at 100 ms intervals. Pass: load reduction to 20% rated within 60 seconds from signal receipt, no turbine trip (speed remains within ±2% of 3000 rpm throughout), grid connection maintained throughout (voltage remains at 400 kV ± 5%), plant able to accept plasma restart command at T+90 seconds.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Turbine runback response on disruption signal (SUB-REQ-045) is a combined PCS-control systems test that must be validated on hardware — turbine governor dynamics, steam valve response times, and generator electrical stability under rapid load rejection cannot be fully predicted by simulation. The 60-second runback window is set by the minimum plasma restart preparation time; faster runback risks turbine overspeed, slower runback causes grid instability from frequency deviation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="event">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-pcs-turbine-runback-515">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-044" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-074">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-001: During integrated commissioning, energise the TF coil set to rated current and measure toroidal field at the plasma axis with a calibrated Hall probe array. Confirm field uniformity at the TCA/SMS boundary is within ±0.5% of design and that the plasma vessel experiences no anomalous electromagnetic loads.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The TCA/SMS magnetic interface is safety-critical: field geometry errors prevent plasma confinement and cause disruptions. Direct measurement under rated conditions validates the combined electromechanical interface between coil geometry and plasma vessel positioning.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-ifc001-session-517">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-045" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-075">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-002: During cryogenic commissioning, flow helium coolant through the superconducting magnet transfer lines and cryostats at the specified flow rate. Measure temperature at the coil winding pack inlet and confirm sustained delivery at 4.5 ± 0.1 K, 1.5 bar, 8 g/s per cryostat with temperature stability ±0.05 K.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The helium coolant interface defines the thermal margin for superconducting operation. Any degradation beyond ±0.1 K risks thermal runaway and quench. Testing under representative conditions is required to validate the cryogenic plant control system and transfer line thermal performance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-ifc002-session-517">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-046" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-076">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-003: During fuel injection commissioning using non-tritiated DT-simulant pellets, fire pellet sequences at the specified 1–10 Hz rate and confirm pellet integrity at the plasma vessel injection port using high-speed imaging. Verify no backflow path to the tritium plant using tracer gas.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The fuel injection interface is the boundary between the tritium-bearing plant and the plasma vessel. Verifying pellet injection rate, integrity, and confinement of any backflow validates both the fuelling performance and the tritium confinement integrity of this interface.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-ifc003-session-517">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-047" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-077">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-004: During integrated power operation at fusion power ≥ 500 MW, measure primary coolant flow rate and inlet/outlet temperatures at the TCA/PCS boundary. Calculate transferred thermal power and confirm ≥ 500 MWth is delivered to steam generators with temperature uniformity within ±5°C across all coolant loops.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The thermal power interface is the energy extraction boundary of the plant. Verification at rated fusion power is required to confirm the primary heat removal capacity, which determines gross electrical output and efficiency. This cannot be analytically substituted — actual thermal performance depends on tritiated water chemistry and neutron-activated material properties.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-ifc004-session-517">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-048" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-078">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-005: During plasma operations, inject synthetic diagnostic data into the PCS front-end at 1 MHz and measure end-to-end latency to control actuator command output. Confirm round-trip latency ≤ 1 ms and simultaneous throughput from ≥ 40 diagnostic channels. Inject a simulated disruption precursor and confirm PPS interlock triggers within 50 ms.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The PCS/TCA data interface is the real-time control loop for plasma stability. Latency and bandwidth violations cause control lag that precipitates or worsens disruptions. Testing with synthetic signals allows controlled validation of the interface without requiring a live plasma.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-ifc005-session-517">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-049" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-079">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-006: With the magnet power supply system active, command a step change in poloidal coil current from the Plasma Control System real-time controller. Measure the coil current response time and confirm the specified slew rate is achieved within ±2% of commanded value. Inject a hardwired quench interlock signal and verify current dump response within the required time.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The PCS/SMS coil current command interface controls plasma position and shape. Incorrect slew rates or command latencies cause loss of plasma position control and potentially disruption. The quench interlock path must be verified as a hardwired, not software, safety function.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-ifc006-session-517">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-050" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-080">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-007: Before first plasma operations, evacuate the plasma vessel from atmospheric pressure and measure base pressure using calibrated ion gauges at vessel midplane. Confirm pressure ≤ 1×10⁻⁶ Pa is achieved within the pump-down sequence. Inject a controlled helium leak at the vessel wall and verify the leak detection system triggers and isolates within the required time.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The vacuum interface defines the plasma environment: contamination and fuel dilution at pressures above 1×10⁻⁶ Pa prevents ignition. The leak detection test is safety-critical — an undetected vacuum breach during operations would quench plasma and could release tritiated gas to the building.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-ifc007-session-517">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-051" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-081">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-008: During cold acceptance testing, manoeuvre the IVIMM through all horizontal maintenance ports and demonstrate end-effector positioning to the specified ±2 mm accuracy at representative in-vessel locations. Verify dose rate at the port perimeter does not exceed the shielding requirement when radioactive sources are installed in the vessel.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The maintenance access interface between RHS and TCA is the physical boundary for in-vessel maintenance. Position accuracy must be demonstrated before remote handling of radioactive components; incorrect positioning can cause component damage or contamination spread. Shielding verification is a regulatory requirement for any maintenance access to an activated vessel.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-ifc008-session-517">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-052" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-082">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-009: During steady-state power operation, measure active power, voltage, frequency, and power factor at the 400 kV HV busbars using calibrated power quality analysers. Confirm ≥ 100 MW net export, 400 kV ± 5%, 50 Hz ± 0.5 Hz, and power factor ≥ 0.95 lagging over a 24-hour period. Conduct a rapid load rejection test from full power and record grid stabilisation time.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The grid export interface is the primary commercial output boundary of the plant. Grid Code compliance requires direct measurement at rated power — analytical prediction from component efficiencies is insufficient for compliance sign-off by the grid operator. The load rejection test verifies grid stability, which is a licence condition.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-ifc009-session-517">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-053" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-083">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-023: During tritium plant commissioning, flow a representative tritium-in-helium mixture (0.1-1% T/He by volume) through the BTES-ISS transfer manifold at minimum (1 slm) and maximum (10 slm) design flow rates. Measure tritium concentration at the ISS feed manifold inlet using a calibrated calorimetric tritium monitor and confirm readings match the injected concentration within ±5% relative at both endpoints. Verify the permeator and compressor stage operate within design pressure envelope throughout, and confirm no tritium leakage exceeds 1 Bq/cm² on all outer surfaces.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-023 defines the tritium concentration and flow rate envelope at the BTES-ISS boundary. The precise T/He ratio and flow range must be confirmed by direct measurement because downstream ISS column separation efficiency degrades outside this envelope, risking fuel cycle disruption and tritium inventory accumulation. Test is required — Analysis cannot account for real permeator and compressor pressure-drop behaviour at commissioning conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; tritium-plant; sil-3; session-518; idempotency:ver-ifc023-session-518; idempotency:ver-ifc023-session-518">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-054" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-084">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-049: On the completed ISS installation, measure steady-state power consumption using calibrated three-phase power analyser at rated cryogenic distillation throughput. Confirm continuous power demand does not exceed 350 kW and peak demand during column start-up does not exceed 420 kW. Interrupt grid supply for 30 minutes and confirm the UPS maintains ISS process control and safe shutdown capability throughout, verified by continuous monitoring of column temperatures, pressures, and safety valve positions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-049 governs ISS electrical supply sizing and UPS capacity — safety-critical because loss of process power during tritium operations risks column flooding or uncontrolled tritium release. The 30-minute UPS duration is the design basis for operator-supervised safe shutdown after a grid outage; this must be demonstrated on the as-built system.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; tritium-plant; sil-3; session-518; idempotency:ver-sub049-518; idempotency:ver-sub049-518">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-055" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-085">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-050: Assert the Plant Protection System emergency isolation command to the ISS via the hardwired interface. Measure time from command assertion to confirmed termination of cryogenic distillation column operations and closure of all tritium-bearing stream isolation valves using a high-speed data logger. Confirm sequence completes within 30 seconds for 10 consecutive tests. Then isolate automated process control and confirm the system maintains passive safe state (no tritium release, no uncontrolled pressure rise) for at least 4 hours by remote monitoring.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-050 is SIL-3 safety-critical: ISS must respond to emergency isolation within 30 seconds to prevent tritium release escalation. The 4-hour passive safe state ensures safety during extended loss of control power. Both timings must be demonstrated on the as-built system — analytical prediction is insufficient at SIL-3 confidence level.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; tritium-plant; sil-3; session-518; idempotency:ver-sub050-518; idempotency:ver-sub050-518">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-056" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-086">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-051: Inspect the as-built turbine hall structure with a certified structural engineer. Confirm floor load rating certificate covers at least 15 kN/m² for turbine and generator foundations. Measure maintenance access clearances around all major equipment faces at three height levels using laser distance meter and confirm minimum 2 m on all. Review structural drawings for equipment envelope compliance against design specification.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-051 specifies turbine hall structural and maintenance access provisions. Floor load rating is a structural certificate; clearances are dimensional attributes. Inspection is appropriate because both can be directly verified against design drawings and physical measurement without dynamic testing.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Inspection">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; power-conversion-system; sil-1; session-518; idempotency:ver-sub051-518; idempotency:ver-sub051-518">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-057" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-087">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-052: Conduct structural inspection of the as-built Tritium Plant confinement building. Confirm nuclear-grade seismic qualification certificate. Measure concrete wall thickness at three cross-sections per wall face using calibrated ultrasonic thickness gauge and confirm 600 mm minimum throughout. Calculate secondary confinement envelope volume from as-built drawings and confirm at least 2500 m³. Review radiation shielding analysis against 600 mm wall thickness.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Tritium Plant building is the physical confinement barrier preventing tritium release — a catastrophic hazard (H-002, SIL-3). Wall thickness and volume are geometric properties verifiable by measurement and inspection. Seismic qualification requires a formal certificate of conformance per nuclear-grade standards.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Inspection">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; tritium-plant; sil-3; session-518; idempotency:ver-sub052-518; idempotency:ver-sub052-518">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-058" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-088">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-053: Inspect the as-built Cryogenic Plant building. Measure insulated floor area using laser measurement system and confirm at least 800 m². Confirm minimum clear height of 8 m using laser gauge at each bay. Inspect cold box support frame structural certification documents confirming 50-tonne load capacity. Verify total helium dewar capacity from manufacturer datasheets confirms minimum 10,000 L. Confirm segregated bays for compressors, cold boxes, dewars, and control room are present and accessible.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Cryogenic Plant building dimensions, structural provisions, and dewar capacity are physical constraints on operational safety and maintenance. These are documentary and dimensional attributes verifiable by measurement and document review — no operational performance testing is required at building level.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Inspection">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; cryogenic-plant; sil-2; session-518; idempotency:ver-sub053-518; idempotency:ver-sub053-518">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-059" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-089">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-054: During vacuum system pre-commissioning, confirm by physical count and inspection that 12 turbomolecular pump assemblies are installed on the tokamak support structure. Pressure-test each bolted flange enclosure to 1.5 bar differential using nitrogen and confirm leakage does not exceed 1×10⁻⁸ Pa·m³/s per enclosure using calibrated helium leak detector. Inspect roughing pump bay for concrete biological shielding. Verify total vacuum manifold pipework volume by dimensional analysis of as-built drawings, confirming compatibility with 1000 m³ plasma vessel.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Vacuum system pump count, enclosure structural integrity, and shielding presence are physical configuration attributes verified by inspection. Flange pressure testing at 1.5× design differential confirms structural containment integrity prior to plasma operations. Manifold volume compatibility is a design parameter checked against as-built drawings.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Inspection">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-INTEGER THE-VALUE="57">
            <DEFINITION><ATTRIBUTE-DEFINITION-INTEGER-REF>attr-qaScore</ATTRIBUTE-DEFINITION-INTEGER-REF></DEFINITION>
          </ATTRIBUTE-VALUE-INTEGER>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; vacuum-system; sil-2; session-518; idempotency:ver-sub054-518; idempotency:ver-sub054-518">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-090" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-090">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SYS-REQ-004: On the STEP Disruption Mitigation Test Bench, configure shattered pellet injection (SPI) system with representative pellet composition and gas injection valve. Inject simulated disruption trigger signal. Measure SPI actuation time from trigger to pellet impact using high-speed photodiodes (&lt; 0.1 ms resolution). Confirm actuation ≤ 10 ms. Simultaneously, record first-wall calorimeter readings. Pass: SPI actuation ≤ 10 ms from trigger signal; integrated first-wall thermal load ≤ 0.5 MJ/m² over any 100 ms window post-trigger at maximum disruption energy (Q=5 plasma, 500 MWth stored energy). Repeat for massive gas injection (MGI) path. Verify both paths independently and in combination.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-004 is SIL-3: disruption mitigation failure can deposit &gt; 100 MJ onto first-wall panels in &lt; 1 ms causing tungsten melting and plasma-facing component loss. Test verification is mandatory for SIL-3 safety requirements per IEC 61508 — Analysis alone cannot validate the actuation latency or thermal load mitigation under realistic disruption energy. The 10 ms window and 0.5 MJ/m² limit are the design basis values that prevent first-wall damage; a test must demonstrate these under worst-case Q=5 conditions. This VER was absent from the project; added in validation session 519 to close silWithoutVer blocker.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="event">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; safety; sil-3; plasma-control-system; session-519; idempotency:ver-sys-004-519; idempotency:ver-sys-004-519">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-091" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-091">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SYS-REQ-005: Perform integrated tritium containment integrity test across all Tritium Plant and in-vessel boundary segments. (1) Pressure-cycle the primary containment (vacuum vessel and first wall) to 2× design pressure and conduct helium mass spectrometer leak test at each boundary penetration — pass criterion: zero detectable leaks &gt; 1×10⁻⁹ Pa·m³/s. (2) Inject a 1 g tritium tracer into the primary containment boundary under simulated Loss of Coolant Accident (LOCA) conditions. Monitor secondary containment tritium monitors continuously for 72 hours. Pass: secondary containment tritium concentration remains &lt; 1 Bq/m³ above background, demonstrating &lt; 0.1 g release through both barriers. (3) Review safety analysis demonstrating dual-barrier integrity under all Design Basis Accidents.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-005 is SIL-3: uncontrolled tritium release above 0.1 g can exceed the regulatory release limit and public dose constraint (1 mSv/year off-site). Test verification is mandatory for SIL-3 safety requirements. The dual-barrier test must be performed at system level to verify the complete containment chain including all penetrations, seals, and isolation valves — subsystem-level leak tests alone cannot demonstrate the system-level release bound. Added in validation session 519 to close silWithoutVer gate blocker.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; safety; sil-3; tritium-plant; session-519; idempotency:ver-sys-005-519; idempotency:ver-sys-005-519">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-092" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-092">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SYS-REQ-006: On the STEP SMS full-scale quench protection test facility (or type-tested coil set representative of production magnets), inject a calibrated resistive voltage fault to trigger quench detection. Record: (a) quench detection time from fault injection to protection system output signal, (b) energy extraction rate measured at dump resistor terminals, (c) total energy extraction time to complete discharge, (d) hot-spot temperature calculated from coil resistance rise using voltage tap network at 1 kHz sampling. Pass: quench detected within 100 ms of fault injection; total energy discharge to dump resistors completed within 30 seconds; hot-spot temperature ≤ 300 K throughout. Test at full magnet stored energy (50 GJ equivalent by inductive scaling if full-energy test is not practicable). Validate by analysis for scaled-up cases with test data as anchor points.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-006 is SIL-2: quench protection failure in a 50 GJ magnet can cause catastrophic quench propagation, coil burnout, or cryogenic explosion. Test verification is required for SIL-2 to validate both the detection algorithm and the energy extraction circuitry; Analysis alone cannot capture voltage arc faults, busbar resistance faults, or quench propagation delays that only manifest in hardware testing. The 30-second extraction window and 300 K hot-spot limit are derived from NbTi/Nb3Sn damage thresholds. Added in validation session 519 to close silWithoutVer gate blocker.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="event">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; safety; sil-2; superconducting-magnet-system; session-519; idempotency:ver-sys-006-519; idempotency:ver-sys-006-519">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-093" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-093">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SYS-REQ-007: On the integrated passive decay heat removal test rig (full-scale replica of in-vessel cooling circuit with electrically-heated first wall panels simulating decay heat loads), de-energise all AC power supplies simultaneously to simulate total station blackout. Monitor temperatures at 50 thermocouple locations on first wall, divertor, and structural supports at 1-second intervals for 72 hours post-blackout. Measure natural circulation coolant flow rate using non-intrusive ultrasonic flow meters at primary loop inlet and outlet. Pass: all structural temperatures remain below material design limits (tungsten FW panels &lt; 800°C, structural steel &lt; 500°C, coolant bulk temperature &lt; 350°C) continuously for 72 hours without any active pump or external power input. Supplement with validated thermal-hydraulic analysis (RELAP5 or equivalent) for conditions not testable at full scale.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-007 is SIL-2: passive decay heat removal is the ultimate safety function for loss-of-power events. If decay heat removal fails, first wall temperature rises above tungsten recrystallisation temperature (1200°C) within 2-4 hours, causing structural failure and potential loss of confinement. Test verification is needed because natural circulation flow rates depend on pipe routing geometry, fluid thermophysical properties, and local heat sources that can only be validated in hardware — computational analysis alone has ±30% uncertainty in natural circulation prediction. The 72-hour window covers the period of significant decay heat (first 72 hours, radioactive decay drops to &lt; 1% of peak rate). Added in validation session 519.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; safety; sil-2; tokamak-core-assembly; session-519; idempotency:ver-sys-007-519; idempotency:ver-sys-007-519">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-094" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-094">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SYS-REQ-011: On the integrated Plant Protection System test bench, inject a simulated accelerometer signal exceeding 0.1g OBE threshold on all seismic channels simultaneously. Record: (a) time from signal injection to plasma shutdown signal output (hardwired to PCS disruption mitigation system), (b) time from signal injection to confirmed seismically-safe state of each subsystem (magnets in hold, tritium isolation valves closed, vacuum system in standby, coolant systems depressurised to safe state). Timestamps logged at 1 ms resolution by independent data acquisition system. Pass: plasma shutdown signal issued ≤ 100 ms from OBE threshold signal injection; all subsystems confirm seismically-safe state ≤ 10 seconds from OBE signal. Additionally, perform shake-table test on seismic accelerometer sensors and PPS trip logic cabinet at 0.1g amplitude 1-10 Hz sweep to confirm no spurious trips and no missed trips.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-011 is SIL-3: seismic event during plasma burn can induce halo currents if shutdown is delayed beyond 100 ms, causing asymmetric electromagnetic loads that exceed the structural design basis for the vacuum vessel. Test verification is mandatory for SIL-3 per IEC 61508. Both the 100 ms shutdown window and the 10-second subsystem safe-state transition must be measured on integrated hardware — simulation cannot capture hardwired relay latencies, PLC scan times, or valve actuation dynamics that determine the actual trip-to-safe-state timeline. The seismic sensor shake-table test is required to confirm instrument reliability at the 0.1g OBE level. Added in validation session 519.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="event">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; safety; sil-3; session-519; idempotency:ver-sys-011-519; idempotency:ver-sys-011-519">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-095" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-095">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SYS-REQ-012: On the as-built STEP facility at full-power plasma operation (minimum Q=5, ≥ 500 MWth fusion power), measure neutron and gamma dose rates at all occupied area boundaries using IAEA-calibrated rem-counter dosimeters and thermoluminescent dosimeters (TLDs). Take readings at: control room, maintenance corridors adjacent to the tokamak hall, equipment rooms within 20 m of the plasma axis, and all port-plug penetration endpoints. Pass: all occupied area dose rates &lt; 10 µSv/hr during steady-state full-power burn. Supplement with MCNP6 Monte Carlo shielding analysis benchmarked against at least 3 in-situ measurement points to validate analysis predictions for inaccessible locations. Ensure TLD dosimeters are co-located with rem-counters at accessible locations for cross-validation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-012 is SIL-1: neutron streaming above 10 µSv/hr in occupied areas would violate UK IRR 2017 designation requirements for supervised areas and compromise worker dose budgets. While MCNP analysis can predict streaming, actual penetrations (cable trays, cooling pipes, diagnostic ports) have installation tolerances and local gaps that analysis may underestimate. In-situ measurement at full power is the only definitive verification method. 10 µSv/hr limit is consistent with ONR-supervised area boundary during continuous occupancy (40 hr/week × 50 weeks × 10 µSv/hr = 20 mSv/year, the legal limit). Added in validation session 519.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; safety; sil-1; session-519; idempotency:ver-sys-012-519; idempotency:ver-sys-012-519">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-060" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-096">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-014: On the as-built plant with all bulk shielding installed, map dose rates at all zone boundary transitions using calibrated dose rate meters (Canberra RO20 or equivalent). (1) Confirm each boundary is classified correctly: Supervised &lt;6 µSv/hr, Controlled 6–600 µSv/hr, High Radiation &gt;600 µSv/hr per IEC 60364. (2) Inject simulated high-dose-rate signal to each access interlock and verify personnel access prevention response within 2 seconds. Pass: all boundary dose rates within zone classification thresholds; 100% of access interlocks respond correctly.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-014 requires as-built zone classification and access interlock response; MCNP analysis alone cannot account for as-built boundary conditions. In-situ measurement is required. Created in validation session 525 to close verification gap on radiation protection zoning.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-sub-014-radiation-zoning-525">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-061" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-097">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-037: On the STEP Remote Handling System integration test facility (1:1 scale vessel mockup), conduct a simulated full blanket module exchange cycle. Using robotic deployment with planned 2-shift 16-hr/day working pattern: (1) remove all 18 blanket modules in sequence, recording cycle time per module and total elapsed calendar time; (2) install replacement set, recording re-docking accuracy to ±0.5 mm; (3) confirm total elapsed time from first module extraction to final module lock-in does not exceed 90 calendar days. Pass criteria: ≤90 calendar days elapsed; ≤0.5 mm re-docking positioning error on 100% of modules; zero dropped modules or tool snags.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-037 mandates a 90-day calendar-time constraint on blanket exchange — this can only be verified by a full-duration demonstration on representative equipment, as analysis cannot account for tool jams, shift changeover inefficiencies, or real-time repair of minor handling failures. Demonstration at 1:1 scale is required rather than test-bench because the constraint spans the full robotic task sequence. Created in validation session 525.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-sub-037-blanket-exchange-525">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-062" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-098">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-042: During first D-T power operations at Q&gt;=5 sustained burn, measure the gross-to-net thermal efficiency of the Power Conversion System. (1) Record steam generator primary inlet and outlet enthalpy (calibrated thermocouples + flow meters, accuracy ±0.5% of reading); (2) record gross turbine-generator output at generator terminals (calibrated Rogowski coil power meter, accuracy ±0.3%); (3) record all station service loads (auxiliary transformers, cryo plant, plasma heating, vacuum pumping) via calibrated revenue-grade submeters; (4) calculate net efficiency = (gross output − station service) / total thermal input. Pass criteria: measured net efficiency ≥25% at steady-state burn conditions sustained for ≥30 minutes.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-042 mandates ≥25% gross-to-net efficiency, which depends on total auxiliary load at full-power plasma conditions — these loads (cryo plant, plasma heating systems) cannot be reliably estimated from component efficiencies alone and must be measured at integrated plant level. The 30-minute hold criterion ensures steady-state is reached before reading. Created in validation session 525 to close verification gap.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-sub-042-pcs-efficiency-525">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-063" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-099">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SYS-REQ-001: During first D-T plasma campaign, demonstrate sustained plasma burn at Q&gt;=5 for at least one pulse. (1) Configure plasma with current &gt;=10 MA using central solenoid flux swing; (2) engage auxiliary heating (NBI + ECRH) to reach ignition conditions; (3) record plasma fusion power via neutron yield measurement (calibrated 235U fission chambers, accuracy ±5%), auxiliary heating power from calorimetric measurement, and pulse duration from plasma current measurement; (4) calculate Q = fusion power / auxiliary heating power; (5) maintain burn for duration &gt;=2 hours to demonstrate lower bound. Pass criteria: Q&gt;=5 measured on at least one pulse sustained &gt;=2 hours with plasma current &gt;=10 MA.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-001 is the primary performance requirement for STEP and the ultimate demonstration of the plant's purpose. Only in-situ measurement during actual D-T plasma operation can verify Q&gt;=5 with the required plasma current — no analysis or sub-system test can substitute for integrated first-plasma verification. Created in validation session 525 to close SYS-REQ-001 gap identified in S-001 scenario walkthrough.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-sys-001-qge5-burn-525">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-100" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-100">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-055: Submit seismic qualification reports (ASCE 4-16 methodology) for the Tokamak Core Assembly support structure, SMS coil support structure, and Cryogenic Plant building, each demonstrating calculated member stresses remain below 90% yield at OBE 0.1g and below 120% yield (temporary allowable) at SSE 0.2g. Confirm that vacuum vessel boundary seal analysis shows no penetration of leakage paths after OBE loading.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-055 is an Analysis-verified requirement per ASCE 4-16 (seismic analysis of nuclear safety-related structures). Physical test at 0.1g ground acceleration is not practicable for civil structures of this scale; industry-accepted practice (confirmed by ONR licensing precedent for fusion facilities) is validated structural analysis with factor-of-safety margins.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Analysis">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-sub055-seismic-validation-527">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-101" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-101">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-056: On the integrated passive decay heat removal test rig, isolate all active cooling pumps and powered valves. Apply 10 MW resistive heating load to first-wall cooling circuit representative of decay heat profile (exponential decay from 10 MW at t=0 following 6-hour full-power burn). Confirm maximum first-wall surface temperature does not exceed 350 degrees C after 72 hours with natural convection only. Repeat with loss of grid power (battery-backed instrumentation only).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-056 is SIL-2 (H-004 LOCA): full-power passive cooling test with representative afterheat profile is required by IEC 61513 for safety function qualification. 350 degrees C limit derived from tungsten first wall material limit under gamma heating. Test extends VER-REQ-093 (system level) with the specific SUB-level passive path verification.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-sub056-decay-heat-validation-527">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-064" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-102">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SYS-REQ-003: During the first D-T operating campaign at rated neutron wall loading, measure tritium breeding blanket performance by collecting all bred tritium in the processing loop for a period of no less than 30 days of continuous full-power operation. Calculate TBR from the ratio of tritium produced to tritium consumed over the measurement interval. Accept if: TBR ≥ 1.1 (direct measurement), net reserve accumulation rate ≥ 10% of DT consumption rate, and projected 12-month reserve inventory ≥ 1 kg. Repeat at two plasma current settings to confirm breeding consistency.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-003 specifies TBR ≥ 1.1 and 1 kg reserve within 12 months — the only demonstrable way to confirm this is measurement of bred tritium vs consumed tritium over an extended full-power campaign. Test verification is required because TBR is sensitive to as-built blanket geometry, tritium leakage, and material transmutation effects not fully captured by neutronic analysis alone. IEC 61508 and ONR fuel cycle licensing requires demonstration of tritium fuel sufficiency before extended D-T operation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-sys003-tbr-session-528; idempotency:ver-sys003-tbr-session-528">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-065" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-103">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SYS-REQ-008: During plasma vessel acceptance testing before first plasma, pump down from atmospheric pressure and confirm base pressure &lt; 1×10⁻⁶ Pa as measured by calibrated Bayard-Alpert gauge at the geometric mid-plane port. Subsequently, perform integrated leak rate test: with all penetrations sealed, pressurize to 10 Pa with He-4 tracer gas and measure total leak rate using a mass spectrometer leak detector on the turbomolecular pump foreline. Accept if: base pressure ≤ 1×10⁻⁶ Pa within 48 hours of pump-down commencement, total He leak rate &lt; 1×10⁻⁹ Pa·m³/s per penetration seal. Reject if either threshold is exceeded.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-008 specifies vacuum performance as &lt; 1×10⁻⁶ Pa and total leak rate &lt; 1×10⁻⁹ Pa·m³/s per seal. These are directly testable values requiring physical measurement — analysis of vacuum pumping speed and geometry cannot account for as-built seal surface finish, fastener torque, and weld porosity. Vacuum integrity is a prerequisite for first plasma; failure would contaminate the plasma and trigger disruptions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-sys008-vacuum-session-528; idempotency:ver-sys008-vacuum-session-528">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-066" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-104">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SYS-REQ-009: On the Remote Handling System integration facility, with a full-scale mock-up of the divertor cassette and RHS manipulator arms, demonstrate replacement of all 54 divertor cassettes (or representative scaled count as agreed with the project authority). Measure elapsed time from first cassette removal start to final cassette installation and re-commissioning. Record position accuracy at cassette docking interface using laser tracker calibrated to ±0.1 mm. Accept if: full cassette replacement completed within 4 calendar months, position accuracy ≤ 2 mm at all docking interfaces. Perform three trials and accept on worst-case trial result.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-009 specifies 4-month full replacement campaign and 2 mm positioning accuracy. Demonstration on the full-scale RHS integration facility is required because maintenance campaign duration and positioning accuracy depend on tooling reliability, human factors, and remote dexterity that cannot be established by analysis alone. This matches the demonstration verification method in SYS-REQ-009 and aligns with ITER RH qualification programme precedent.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-sys009-rhs-session-528; idempotency:ver-sys009-rhs-session-528">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-067" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-105">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SYS-REQ-010: After at least one complete 6-month operating campaign, analyse plant operational records to calculate availability: availability = (total burn-hours during campaign) / (campaign calendar-hours − scheduled maintenance windows). Compile unplanned downtime log with root causes. Accept if calculated availability ≥ 50% over the campaign period, excluding planned maintenance windows as defined in the campaign operations plan approved before start. Document sensitivity: if any single unplanned downtime event &gt; 72 hours was excluded from the analysis, calculate availability including that event.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-010 specifies ≥ 50% operational availability over a 6-month campaign. Availability is a statistical property that can only be determined post-hoc from operational records; no pre-operational test can demonstrate it. Analysis of operational logs against the defined formula is the appropriate and only practical verification method. ONR nuclear site licensing for STEP requires demonstrating operational availability as part of the environmental statement.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Analysis">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-sys010-availability-session-528; idempotency:ver-sys010-availability-session-528">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-068" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-106">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SYS-REQ-013: During integrated plant commissioning, enumerate all plasma diagnostic systems installed and commissioned with demonstrated data acquisition. For each diagnostic: confirm calibration certificate from a traceable source, confirm timing synchronisation to the plant master clock and verify jitter ≤ 1 µs by injecting a synchronised test pulse across all diagnostic data acquisition channels simultaneously. Accept if: total commissioned diagnostics ≥ 40, all diagnostics synchronised with timing accuracy ≤ 1 µs, coverage matrix confirms at least one system each for magnetic, kinetic (Thomson scattering or charge exchange), and spectroscopic measurement of the plasma.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-013 requires ≥ 40 plasma diagnostics with calibrated time-synchronised measurements. Demonstration is the appropriate method because it requires physical enumeration of commissioned systems and verification of timing synchronisation via an instrumented test pulse — analysis cannot confirm as-built diagnostic health or actual jitter performance. Derives from STK-REQ-017 (comprehensive plasma characterisation for burning DT plasma research).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-sys013-diagnostics-session-528; idempotency:ver-sys013-diagnostics-session-528">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-069" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-107">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SYS-REQ-014: Using the as-built materials inventory and neutron activation analysis code validated against ITER material activation benchmarks, calculate the waste classification fraction for all primary activated structures (first wall, breeding blanket modules, divertor cassettes, vacuum vessel, magnet coil formers) at 100 years post final shutdown. Apply ONR radioactive waste classification criteria (LLW: &lt; 4 GBq/tonne beta/gamma, ILW: remainder). Accept if: ≥ 80% by volume of calculated decommissioning waste falls in LLW category at 100 years, with sensitivity analysis showing the 80% threshold is maintained if activation code predictions are conservative by factor of 2.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-014 specifies ≥ 80% of waste volume as LLW within 100 years. This is a design-time analysis requirement — it cannot be physically tested at decommissioning (100+ years away). Nuclear activation analysis using validated codes (e.g., FISPACT-II) against the as-built material inventory is the standard method accepted by ONR for waste classification planning. The 2× conservatism margin ensures the threshold is robust against modelling uncertainties.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Analysis">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-sys014-waste-session-528; idempotency:ver-sys014-waste-session-528">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-070" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-108">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SYS-REQ-015: During first grid synchronisation and power export commissioning, measure voltage, frequency, and total harmonic distortion at the 400 kV grid connection point using a power quality analyser certified to IEC 61000-4-30 Class A. Record measurements over a 10-minute continuous window at rated power export. Accept if: voltage at grid connection 400 kV ± 5% (380–420 kV), frequency 50 Hz ± 0.5 Hz (49.5–50.5 Hz), THD &lt; 3% on all harmonic orders 2–50. Repeat at 50% and 100% rated power to confirm linearity.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-015 mandates compliance with National Grid ESO Grid Code for power quality. Physical test using IEC 61000-4-30 Class A instrumentation is required by Grid Code connection agreement — National Grid will not accept simulated or analysis-based compliance for 400 kV connection. The test parameters (voltage, frequency, THD) are directly measurable at first grid synchronisation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-sys015-gridcode-session-528; idempotency:ver-sys015-gridcode-session-528">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-071" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-109">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SYS-REQ-016: Using the radiation protection design basis documentation (site radiation survey, occupational dose assessment, ALARA programme), perform a dose-rate survey of all supervised areas as defined in the Radiation Protection Supervisors programme at rated neutron wall loading (first full-power plasma campaign). Calculate projected annual whole-body dose for a representative worker in each supervised area based on measured dose rates and planned occupancy times. Accept if: projected annual dose ≤ 1 mSv above background for all supervised area workers, the Radiation Protection Supervisors programme is approved by ONR under site licence conditions, and ALARA review documentation is complete for all high-occupancy work areas.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-016 specifies 1 mSv/year dose limit in supervised areas and ALARA compliance under UK IRR 2017 and ONR licence conditions. Analysis verification is appropriate because annual occupational dose is calculated from measured dose rates and occupancy models, not a single testable event. ONR nuclear site licence requires a Radiation Protection Programme and formal dose assessment report — these constitute the analysis record. Physical dose measurement alone cannot verify the annual projection without the time-integration model.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Analysis">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-sys016-rps-session-528; idempotency:ver-sys016-rps-session-528">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-110" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-110">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-055 seismic: The seismic structural qualification analysis shall demonstrate that TCA, SMS, and Cryogenic Plant support structures maintain integrity at OBE (0.1g) and SSE (0.2g) per ASCE 4-16. Acceptance criterion: FEA stress ratios ≤1.0 at SSE; vacuum boundary leak test ≤1×10⁻⁷ mbar·L/s within 72h post-OBE.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Supplements VER-REQ-100 with explicit acceptance criteria for the structural qualification analysis. Analysis method is appropriate per IEC 61513 for civil/structural seismic compliance where full-scale test is infeasible.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Analysis">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-sub055-seismic-qual-529">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:VER-REQ-111" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-111">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-057: During integrated commissioning (hydrogen plasma phase, no tritium), command a planned end-of-pulse shutdown while plasma is in H-mode at intermediate current (&gt;3 MA). Record: (a) time from command receipt to auxiliary heating power zero, (b) time from command receipt to plasma current zero, (c) fuel injection cessation timestamp relative to plasma current zero, (d) whether plasma extinction occurs without disruption signature (no thermal quench on first-wall calorimeters). Repeat at full DT operating current during first D-T operational campaign. Pass criteria: auxiliary heating off in 60 s or less; plasma current zero in 10 to 30 s; fuel injection ceased at least 30 s before current zero; no disruption signature in at least 5 consecutive planned shutdowns.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-057 is the planned shutdown mode coverage requirement. Test is required to confirm the actual timing margins for heating ramp-down, current ramp-down, and fuel injection cessation — these depend on non-linear plasma response and OH coil dynamics that analysis cannot predict with sufficient confidence. The repeat at DT current confirms that the hydrogen plasma commissioning data scales to operational conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-sub057-planned-shutdown-529">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-078" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-112">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify REQ-072: On the vacuum system integration test facility, isolate one turbomolecular pump by closing its gate valve while the vessel is at operating pressure (1e-6 Pa range). Monitor vessel pressure via calibrated ion gauge for 120 seconds post-isolation. Pass criterion: vessel pressure remains at or below 5x10-6 Pa throughout. Verify alarm transmission to simulated control room within 10 seconds of pump fault detection.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Physical single-pump isolation test is required to verify the N+2 redundancy claim. Simulation cannot capture inter-pump flow redistribution or turbomolecular pumping speed changes at partial load. 120-second monitoring window covers the transient response and steady-state re-equilibration.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="event">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-req072-failmode-531">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-079" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-113">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify REQ-073: On the pressure monitoring system test bench, inject each of three sensor fault types (signal loss, out-of-range injection, calibration drift beyond threshold) on one gauge channel while two remaining channels are active. Confirm: (a) fault flagged within 5 seconds per fault type, (b) pressure readout continues from remaining gauges, (c) control room alarm generated, (d) no interlock signal transmitted to simulated PCS.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Fail-safe sensor fault behaviour requires hardware-in-loop testing because the alarm and interlock logic interact. Software-only analysis cannot verify that the hardwired interlock line remains de-asserted on sensor fault. All three fault types must be tested because the detection mechanism differs: signal-loss uses watchdog timeout, out-of-range uses threshold comparator, calibration drift uses moving-average validation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="event">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-req073-failmode-531">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-080" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-114">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify REQ-074: During first plasma commissioning at Q approximately 3 (partial-load operation), measure net export at 400 kV metering point using National Measurement Accreditation Service calibrated meters over a 30-minute stable burn. Measure station auxiliary load total. Pass criterion: net export at least 50 MW, auxiliary loads below 20 MW; if not achieved, confirm alarm is transmitted to control room within 30 seconds.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification at actual Q=3 operating conditions requires integrated system test during commissioning. Partial-load performance cannot be extrapolated from rated-load measurements because thermal efficiency is non-linear with steam flow and condenser back-pressure. National Measurement Accreditation Service calibration is required for a commercially significant milestone.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="event">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-req074-failmode-531">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-081" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-115">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify REQ-075: During PCS acceptance testing, isolate one steam generator from the primary and secondary circuits and operate the remaining circuits at rated plasma thermal input. Measure net electrical output and gross-to-net efficiency using calibrated grid meters and calorimetric primary flow measurement over a 4-hour steady-state run. Pass criterion: gross-to-net efficiency at least 18%, net output at least 60 MW for 72 continuous hours.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Degraded configuration testing cannot be performed by analysis alone because condenser back-pressure, cooling tower performance, and turbine admission valve settings change under reduced steam flow in ways that are difficult to model accurately. A 4-hour test at reduced load confirms thermal equilibrium is reached and sustained. The 72-hour endurance is verified via operational log during a planned maintenance window.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="event">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-req075-failmode-531">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-082" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-116">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify REQ-076: On a steam generator tube bundle test loop pressurised with helium tracer at primary design pressure, open a calibrated simulated tube-leak orifice and measure: (a) time from secondary conductivity spike to automatic isolation valve closure, (b) heat transfer continuity at remaining steam generator circuits. Pass criterion: isolation within 60 seconds, heat transfer continues at least 300 MWth equivalent from remaining circuits, primary coolant temperature maintained at or below 200 degrees C.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Steam generator tube leak isolation is a SIL-3-adjacent function (tritium transport through tube leak) requiring Test verification. Physical test on a tube bundle loop is necessary to verify the leak detection sensitivity and isolation timing; analysis overestimates detection time because secondary water turbulence near the leak varies with local flow conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="event">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="idempotency:ver-req076-failmode-531">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-083" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-117">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-007: Install calibrated Langmuir-probe array and infrared thermography system on a representative first-wall and divertor test module in a linear plasma device operating at 10 MW/m2 steady-state heat flux. Operate at design heat flux for 2,000 thermal cycles. Measure surface temperature, erosion depth (profilometry after each 500-cycle interval), and structural integrity (dye-penetrant inspection). Pass criterion: tungsten armour net erosion rate less than 1 mm per full-power-year (prorated from test duration), no cracking or delamination, peak surface temperature within 200 degrees C of design limit.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="First-wall and divertor thermal endurance is a safety-relevant function: excessive erosion degrades tritium inventory control and produces activated dust (H-007). Test on a representative plasma device is mandatory because finite-element analysis cannot account for synergistic effects of neutron embrittlement, sputtering, and thermal shock in combination. 10 MW/m2 is the design basis from SUB-REQ-007; 1 mm/FPY is the accountability threshold.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="event">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="sil-3-supporting; validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-084" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-118">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-008: At a magnet test facility, energise the full TF coil set to the rated design current. Measure on-axis toroidal field with calibrated Hall-probe mapping array. Measure ripple delta-B/B at 64 poloidal positions around the last closed flux surface perimeter. Inject a calibrated quench into one coil by resistance heater; measure time from heater activation to quench detection signal and from detection to energy extraction initiation. Pass criterion: on-axis field &gt;= 3.0 T, ripple &lt;= 0.5% at all 64 positions, quench detection &lt;= 100 ms, energy extraction initiation &lt;= 300 ms from quench initiation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="TF coil performance is the primary H-003 (superconducting magnet quench) mitigation. SIL-2 requires Test verification. The 100 ms detection and 200 ms extraction timeline derive from energy density calculations: &gt;50 GJ stored energy with detection delay beyond 100 ms risks coil winding insulation damage. Field ripple affects plasma stability margin and is a direct driver of burn performance at Q&gt;=5.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="event">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="sil-2-supporting; validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-088" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-122">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-009: During integrated cryogenics commissioning, energise the full TF and PF coil set to rated current with both cold box trains operating. Disable one cold box train and measure helium temperature at all magnet cryostat instrumentation points over a 4-hour period. Pass criterion: all cryostat temperatures maintained at 4.5 K or below with stability plus or minus 0.1 K, demonstrating continued plasma operations capability at reduced pulse duration.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Cryogenic plant single-train redundancy is required for H-008 (loss of cryogenic cooling) mitigation at SIL-2. Loss of all cryogenic cooling simultaneously causes uncontrolled whole-system quench and asphyxiation risk from helium boil-off. Demonstrating continued magnet operation on one cold box train verifies the redundancy allocation in SUB-REQ-009.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="state">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="sil-2-supporting; validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-089" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-123">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-010: During Tritium Plant integrated commissioning on a deuterium-tritium representative feed, operate the Combined Electrolysis and Catalytic Exchange columns at nominal throughput for 72 hours. Measure tritium inventory at start and end using calibrated calorimetry and ionisation chambers. Measure effluent tritium concentration at the drain point. Pass criterion: inventory accountability uncertainty less than or equal to 1 g over 24-hour accounting periods, processing throughput at least 5 g T/day sustained, detritiation factor at least 1e6 across CECE columns, effluent concentration at most 10 Bq/L.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Tritium accountability is a direct H-002 (tritium release) mitigation and a regulatory prerequisite under GB nuclear site licence conditions. Plus or minus 1 g per 24 hours is the IRCP-recommended minimum for accountancy of inventories in the kg range. Test with actual tritium is mandatory because model predictions of CECE separation factors have uncertainty bands of 15-30% that only integrated testing resolves.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="sil-3-supporting; regulatory; validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-090" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-124">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-011: During first-of-kind power generation commissioning at rated fusion power, operate the steam turbine-generator set at full load for a minimum 6-hour continuous run. Measure net electrical export at the 400 kV grid connection point. Measure auxiliary plant consumption. Calculate gross-to-net efficiency. Record all forced outage intervals over the 6-month operational campaign. Pass criterion: net export at least 100 MW, efficiency at least 25%, availability at least 90% excluding planned maintenance outages.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Net power export of 100 MW and 25% efficiency are the commercial mission success criteria in SYS-REQ-002. Analysis alone cannot account for parasitic losses from plasma heating systems and cryogenic plant at full load. 90% availability must be demonstrated over the full 6-month campaign to confirm design margins.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-091" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-125">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-012: On the full-scale Remote Handling test rig in the dedicated remote handling facility, with representative inactive divertor cassette mock-ups installed in the lower vessel port mock-up, execute a timed full-cassette replacement sequence for all cassette positions. Use dose-rate environment simulator to verify continuous operation at 0.5 Sv/hr. Log all unplanned stoppages over a 500-hour endurance test run. Pass criterion: full cassette replacement within 21 calendar days, positioning accuracy at most 2 mm in all three translational axes verified by laser tracker, MTBF at least 500 hours.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="21-day cassette replacement is the critical path activity in the 4-month maintenance campaign. Demonstration is appropriate because the acceptance evidence is observational: the replacement is either completed within schedule or it is not. MTBF of 500 hours and 2 mm accuracy are safety-relevant because incorrect positioning creates a first-wall gap concentrating heat flux.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-092" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-126">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-013: During facility commissioning after tokamak assembly, operate the vacuum pumping system from atmospheric pressure with vessel sealed. Measure vessel pressure at calibrated ionisation gauges at 6 divertor pumping duct locations. Measure total outgassing rate by rate-of-rise method after reaching base vacuum. Verify pumping speed during simulated burn by injecting calibrated gas loads. Pass criterion: base pressure at most 1e-6 Pa achieved within 24 hours of vessel closure, outgassing rate at most 1e-3 Pa.m3/s, effective pumping speed at least 50 m3/s at divertor ducts.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Base vacuum of 1e-6 Pa is required for plasma breakdown. Failure to reach this within 24 hours increases air ingress risk (H-005, SIL-2). Testing is mandatory because modelled pumping speeds have uncertainties of 20-40% from surface condition and geometry effects that only commission-time testing can resolve.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="sil-2-supporting; validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-093" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-127">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-014: During radiation protection commissioning at rated operation, measure dose rates at all designated zone boundary positions using calibrated TEPC instruments traceable to national standards. Inject a calibrated dose-rate signal above the Controlled/High Radiation boundary threshold into the zone interlock system and measure time to interlock activation. Pass criterion: all area classifications consistent with calculated dose rates, access door interlock activates within 100 ms of threshold exceedance, instruments accurate to within 20% of calibration standard.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Personnel radiation protection interlocks must be demonstrated by Test at full power because shielding effectiveness depends on actual source terms. 100 ms interlock response is a safety-critical timing requirement (H-010, SIL-1) where analysis cannot account for communication delays in hardwired interlock circuits under industrial noise conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="sil-1-supporting; regulatory; validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-094" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-128">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-049: During ISS commissioning, apply rated 415 V AC three-phase supply and measure process performance at nominal throughput. Interrupt primary supply and verify automatic changeover to backup supply. Measure separation factor on deuterium-tritium representative feed before and after switchover. Pass criterion: uninterrupted ISS operation through supply switchover, separation factor maintained within 5% of nominal value during transition, power quality within specification on backup supply.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ISS power continuity is a H-002 (tritium release) mitigation: loss of ISS power during separation causes uncontrolled tritium inventory redistribution in the column system. The 5% separation factor criterion ensures tritium balance accountability is maintained through a supply changeover event.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="sil-3-supporting; validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-095" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-129">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-050: During ISS integrated test, assert the PPS emergency isolation hardwired command at the ISS panel interface. Measure time to complete shutdown of all ISS process flows and closure of all isolation valves. Pass criterion: all process flows halted and isolation valves closed within 10 seconds of PPS command assertion, hardwired signal pathway verified by functional continuity check independent of software.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="PPS emergency isolation of ISS is the primary tritium confinement response for column leak events (H-002). The hardwired pathway independence from software is a SIL-3 architecture requirement under IEC 61511. Demonstration verification is appropriate as the acceptance criterion is binary: isolation either completes within 10 s or it does not.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="event">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="sil-3-supporting; validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-096" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-130">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-051: Inspect completed PCS turbine hall building against civil engineering as-built drawings and structural load calculations. Verify floor load rating by review of structural engineering certificate, crane rating plate, and equipment installation records. Pass criterion: structural certificate confirms floor load rating at least 50 kN/m2 at all turbine-generator foundation points, overhead crane rated for heaviest installed component, building footprint accommodates all PCS equipment with required maintenance clearances.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Turbine hall structural adequacy is a Inspection verification because it is established by design certification and physical review of as-built construction, not by test. Floor load rating of 50 kN/m2 is the minimum derived from steam turbine rotor and generator stator mass distribution. Structural deficiency would prevent safe equipment installation or maintenance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Inspection">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-097" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-131">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-052: Inspect completed Tritium Plant building against nuclear safety case, civil engineering certificate, and as-built drawings. Verify Category 1 nuclear confinement classification by review of structural safety analysis report and nuclear site licence documentation. Pass criterion: building certified as Category 1 nuclear confinement structure to nuclear grade standards, confinement penetrations logged and sealed per licence conditions, double-barrier confinement confirmed by inspection of all process penetrations.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Nuclear-grade confinement building classification is established by regulatory inspection and structural certification, not by test. Category 1 confinement is required by H-002 (tritium release) safety case. Physical inspection of penetration seals is the only practical verification method for building-scale confinement.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Inspection">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="sil-3-supporting; regulatory; validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-098" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-132">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-053: Inspect completed Cryogenic Plant building against as-built drawings, mechanical services schedule, and area schedule. Verify insulated floor area by as-built survey measurement. Verify minimum clear height by measurement. Verify helium storage and venting provisions by inspection of installation certificates. Pass criterion: insulated floor area at least 800 m2, minimum clear height at least 8 m in cold box installation areas, helium storage and emergency venting capacity as per design specification confirmed by inspection.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Cryogenic Plant building adequacy is a design compliance matter verifiable by inspection of construction documentation and physical measurement. The area and height specifications ensure adequate working clearances for cold box installation and maintenance. Helium venting capacity is safety-relevant (H-008, asphyxiation risk).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Inspection">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-099" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-133">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-054: Inspect installed vacuum system equipment layout against as-built drawings. Count installed turbo-molecular pump count and verify cryopump configuration by physical inspection. Verify mechanical connections between vacuum equipment and tokamak support structure by inspection of installation records. Pass criterion: 12 turbo-molecular pumps installed and commissioned, cryopumps installed at divertor and first-wall ports as per design, all mechanical connections to tokamak support structure confirmed by installation certificate review.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Vacuum system physical configuration compliance is verifiable by inspection of installed equipment against design drawings. The 12 turbo-molecular pump count derives from pumping speed calculations for 50 m3/s aggregate throughput. Physical installation inspection is more reliable than test for configuration compliance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Inspection">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-100" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-134">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-055: Review structural analysis report for tokamak core assembly, superconducting magnet system, and cryogenic plant support systems. Verify seismic analysis inputs use site-specific ground motion spectra for OBE (0.1g peak ground acceleration) and SSE (0.2g). Verify analysis includes simultaneous LOCA and quench loading combination. Pass criterion: structural analysis report demonstrates all safety class-1 support structures maintain integrity at SSE loading with no plastic deformation at critical joints, combined LOCA and quench scenario analysed with margins meeting nuclear structural design standards.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Seismic structural integrity is verified by Analysis because physical seismic testing of full-scale tokamak structures is not practicable. The OBE 0.1g and SSE 0.2g values are site-specific inputs. Analysis must include the combined LOCA and quench scenario (H-009, SIL-3) because these events are coupled through common-cause seismic initiation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Analysis">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="sil-3-supporting; validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-101" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-135">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-056: On a representative in-vessel cooling circuit test loop with passive decay heat removal path installed, simulate plasma termination by stopping active coolant circulation while maintaining 3 MW decay heat injection via electrical heaters. Measure coolant temperature and pressure over a 24-hour passive cooling period. Pass criterion: peak coolant temperature does not exceed 350 degrees C, system pressure remains within design envelope, natural circulation flow initiated and sustained without active components, all instrumentation remains powered from passive sources.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Passive decay heat removal is the primary H-004 (loss of coolant accident) mitigation following plasma termination. Test is mandatory for SIL-2 functions because natural circulation flow behaviour has strong non-linear dependence on geometry and temperature that analysis cannot bound conservatively. 350 degrees C is the maximum coolant temperature before zirconium-steam reaction risk for beryllium-clad components.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="event">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="sil-2-supporting; validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-102" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-136">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-057: During plasma operations commissioning, issue an operator-commanded end-of-pulse shutdown from the main control room at rated Q=5 conditions. Measure heating power ramp-down profile, plasma current ramp-down trajectory, and total plasma current at termination. Pass criterion: heating power ramped to zero within 30 seconds, plasma current ramped down to zero over 10 to 30 seconds per design, plasma current at final termination below 500 kA, no disruption triggered during the ramp-down sequence, vessel structural loads within design envelope.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Controlled plasma shutdown is the primary planned transition out of Steady-State Burn mode. Failure to execute a smooth ramp-down can trigger a disruption (H-001, SIL-3) with 400 MJ thermal quench. Test is required to verify the actual plasma response to the ramp-down sequence because plasma instability thresholds during current ramp-down are not precisely predictable from MHD analysis alone.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="event">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="sil-3-supporting; validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-103" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-137">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-058: During Tritium Plant operational qualification, simulate failure of each active accountancy and confinement component in turn (isotope separation compressor, CECE column heater, process valves). For each single failure, measure tritium accountancy measurement uncertainty and verify confinement barrier status. Pass criterion: tritium accountancy uncertainty remains at most 1 g per 24-hour period in each single-failure state, at least one confinement barrier intact for all single-failure scenarios, automatic isolation initiated for each failure detected.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Single-failure tolerance for tritium accountability and confinement is a SIL-3 requirement derived from H-002 (tritium release). The regulatory limit of 0.1 g release per event requires that a single component failure cannot cause loss of accountancy (which could mask a leak) or loss of both confinement barriers simultaneously.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="event">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="sil-3-supporting; regulatory; validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-104" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-138">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify SUB-REQ-059: During ISS integrated test, assert the hardwired manual override at the ISS panel interface and confirm all ISS process flows shut down and all isolation valves close. Verify the override path bypasses software control by disconnecting ISS control software while manual override is asserted and confirming isolation is maintained. Pass criterion: all ISS process flows halted within 30 seconds of manual override assertion, override path functional with software disconnected, physical panel switch confirmed as the sole command path for override.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Hardwired manual override is the last-resort tritium confinement action for operators when automated systems fail. Independence from software is essential for SIL-3 defense-in-depth. Demonstration verification is appropriate because the test is observational: either the manual override functions independently of software or it does not.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="event">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="sil-3-supporting; validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-105" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-139">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-010: During integrated cryogenics and tritium plant commissioning, operate the LN2 supply interface at rated flow. Measure LN2 temperature at the Tritium Plant inlet and supply flow rate at the interface connection point. Pass criterion: LN2 supply temperature at 77 K plus or minus 2 K, flow rate meets Tritium Plant specification at rated demand, no cross-contamination between LN2 circuit and tritium process measured by gas analysis at both ends of interface.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="LN2 supply at 77 K is required for Tritium Plant cold trap operation. Incorrect LN2 temperature degrades detritiation factor, risking tritium accountability loss (H-002). Cross-contamination check is essential because a tritium-contaminated LN2 circuit would create an uncontrolled release pathway.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="sil-3-supporting; validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-106" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-140">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-011: During integrated vacuum-tritium interface commissioning, operate the tritiated exhaust gas transfer path at rated throughput. Measure gas flow rate and composition at the vacuum system outlet and tritium plant inlet. Verify inter-system isolation valve closure on loss-of-confinement signal. Pass criterion: throughput at least 200 Pa.m3/s at rated condition, tritiated gas composition within specification for ISS intake, isolation valves close within 5 seconds of confinement loss signal.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Vacuum-to-tritium exhaust interface is the primary tritium process pathway during burn. Insufficient throughput limits fusion power; inadequate isolation on confinement loss creates H-002 release pathway. 200 Pa.m3/s is the rated DT exhaust throughput. 5 s isolation time is derived from maximum tolerable tritium inventory at-risk during an exhaust line failure.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="sil-3-supporting; validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-107" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-141">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-012: During plasma control-vacuum system integrated commissioning, inject test pumping speed setpoint commands from the Plasma Control System to the Vacuum System and measure response time and accuracy. Pass criterion: pumping speed setpoint received and acted on within 100 ms of command transmission, achieved pumping speed within 10% of commanded setpoint, command interface functional over the full operating range of vacuum conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="PCS control of vacuum pumping speed is required for plasma density control during burn. Response time of 100 ms is derived from the plasma confinement time and density control bandwidth needed to respond to ELM events. Test is required because interface latency depends on actual communication stack implementation and cannot be verified by inspection alone.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="event">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-108" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-142">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-013: During plasma control-tritium plant integrated commissioning, inject test pellet injection rate commands from the Plasma Control System to the Tritium Plant pellet injector. Measure command latency and injection rate accuracy. Pass criterion: pellet injection rate command executed within 50 ms, achieved injection rate within 5% of commanded rate, command interface verified across the full pellet rate range.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="PCS command of pellet injection rate is the primary fuel control mechanism during Steady-State Burn. 50 ms latency and 5% rate accuracy are derived from plasma density control requirements: larger lag or error can cause plasma density to drift outside the burn window, triggering density-limit disruption (H-001, SIL-3). Test is required as actual latency depends on network and actuator implementation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="event">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="sil-3-supporting; validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-109" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-143">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-014: During magnet system commissioning at the magnet power supply test facility, energise TF coil set from zero to full rated field via the coil power supply interface. Measure DC voltage and current at the magnet busbars. Test fast discharge by commanding energy extraction and measuring dump resistor current profile. Pass criterion: DC power delivery meets rated voltage and current specification, fast discharge completed within 10 seconds of command, busbar voltage within 5% of specification throughout discharge.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Coil power supply to superconducting magnet interface is the primary H-003 (magnet quench) mitigation pathway. Fast discharge within 10 seconds is required to extract stored energy below the coil damage threshold. Test at full rated current is mandatory because impedance mismatch at the busbar connection cannot be predicted from design alone and affects discharge timing.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="event">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="sil-2-supporting; validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-110" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-144">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-015: Inspect all remote handling tools and manipulator end-effectors that operate inside the tritium confinement boundary against the tritium compatibility certification register. Verify surface coatings and sealing mechanisms by inspection. Check contamination control procedures documentation. Pass criterion: all tools confirmed on certified materials list, all penetrations of confinement boundary use double-seal mechanisms with leak test certification, contamination control procedures reviewed and approved.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="RHS-tritium confinement boundary compatibility is verified by Inspection of material certifications and design documentation because tritium permeation through materials is a property established at manufacturing, not demonstrable without destructive sampling. Double-seal mechanisms are required by H-002 confinement barrier policy.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Inspection">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="sil-3-supporting; validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-111" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-145">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-016: During integrated cryogenics-vacuum commissioning, operate the cold head supply interface to vacuum cryopumps at rated capacity. Measure cold head temperature at the cryopump interface manifold for up to 20 cryopump positions. Verify cryopump regeneration cycle without interrupting cold head supply to remaining pumps. Pass criterion: 4.5 K cold heads supplied to all 20 cryopump positions at rated capacity, cryopump regeneration cycle completed without temperature excursion at other pump positions exceeding 0.2 K.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Cryogenic supply to vacuum cryopumps is required for maintaining divertor pumping speed during burn. Loss of cryopumping reduces vacuum quality and risks plasma contamination. The 0.2 K temperature stability during regeneration cycles verifies that cryopump regeneration does not disrupt plasma operations in adjacent sectors.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-112" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-146">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-017: During PCS-RHS interlock commissioning, assert each hardwired interlock signal from the Plasma Control System that prevents Remote Handling System access during plasma operations. Verify physical access prevention and hardwired pathway independence from software. Pass criterion: all PCS interlock signals prevent RHS access when plasma operations are in progress, interlock path verified as hardwired and independent of software control layer by functional continuity test.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Hardwired prevention of RHS access during plasma operations is a personnel safety requirement: entry to the tokamak hall during burn would result in lethal neutron dose (H-010). Independence from software is required because software failures must not defeat this barrier. Demonstration is the appropriate method as the test is binary: access is prevented or it is not.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="event">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Demonstration">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="sil-1-supporting; validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-113" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-147">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-018: During facility commissioning, measure AC auxiliary power supply at all PCS-to-tokamak auxiliary supply connection points with all major loads active. Measure voltage, frequency, and power quality. Pass criterion: AC supply voltage within 5% of rated value at all connection points under full auxiliary load, frequency within 0.5 Hz of rated, power quality (THD) within BS EN 61000-3 limits, supply available within 30 seconds of grid restoration after outage.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Auxiliary AC supply from PCS to tokamak supports diagnostics, control systems, and cryogenic instrumentation during plasma operations. Supply quality affecting plasma diagnostics can trigger false disruption events. The 30-second restoration time after outage is required to avoid a plasma termination on loss of diagnostic power.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-114" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-148">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-019: During grid connection commissioning, measure imported auxiliary AC power from the National Grid at the PCS station loads connection point with all plant auxiliary systems at full load. Verify power import capability across the range from minimum to maximum station load demand. Pass criterion: import power capability confirmed at maximum station loads demand, power quality at import connection point within Grid Code requirements, automatic transfer to on-site generation within 5 seconds of grid loss.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Grid import for station loads is required for plant commissioning before first plasma (no self-generation available). Automatic transfer to on-site generation on grid loss within 5 seconds ensures continued cryogenic cooling during grid disturbances (H-008 mitigation). Test at full load is required because transformer impedance and cable voltage drop cannot be calculated without site-specific grid impedance data.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ubiquitous">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-115" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-149">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verify IFC-REQ-020: During vessel bake-out commissioning, circulate hot nitrogen gas at rated conditions through the tokamak vessel via the Cryogenic Plant bake-out supply interface. Measure nitrogen gas temperature and flow rate at the vessel inlet and the outgassing rate from the vessel during bake-out. Pass criterion: nitrogen supply at 120 degrees C plus or minus 5 K at rated flow rate, vessel wall temperature uniform within 10 degrees C across all measured points, outgassing rate falls below 1e-3 Pa.m3/s within 96 hours of bake-out initiation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Vessel bake-out is required to achieve the 1e-6 Pa base vacuum needed for plasma operations. Insufficient bake-out temperature or non-uniform wall heating can leave water ice in crevices that outgasses into the plasma, contaminating the first wall. Test is required because heat transfer in the complex vessel geometry cannot be precisely modelled.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-rationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="event">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-pattern</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-verification</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="validation-session-544">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      </SPEC-OBJECTS>
      <SPEC-RELATIONS>
      <SPEC-RELATION IDENTIFIER="rel-0" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-082</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-089</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Regulatory documentary inspection for environmental permitting and ISO 14001 EMS">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Legal and regulatory compliance obligations can only be verified by documentary evidence and third-party inspection; the pass criteria map directly to the specific regulatory instruments in SUB-REQ-082.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-1" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-081</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-088</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Post-intervention RGA test for plasma vessel seal integrity in all operational modes">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="RGA measurement is the only reliable in-situ method for quantifying individual penetration leak rates after maintenance; the test directly validates SUB-REQ-081 seal performance thresholds.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-2" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-080</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-087</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Regulatory compliance inspection for UK IRR 2017 and ALARA Tritium Plant documentation">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Inspection is the correct verification method for regulatory compliance; the pass criteria directly map to the specific IRR 2017 obligations in SUB-REQ-080.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-3" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-085</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-086</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Short-sample and fatigue test for TF Coil Set CICC conductor specification">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Material properties and lifetime performance of CICC conductors can only be confirmed by physical test at representative conditions; analysis cannot substitute for conductor characterisation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-4" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-084</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-085</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Passive quench protection analysis for SMS single-channel failure scenario">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Analysis is the required verification method for passive safety functions in large magnet systems; the pass criterion of 100% energy absorption with no winding damage directly validates the SIL-2 passive safety claim.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-5" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-083</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-084</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="N+1 redundancy functional test for Tritium Plant isotope separation modules">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Test is the only method that validates module-level failover under representative operating conditions; analysis alone cannot confirm throughput floor without commissioning evidence.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-6" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-079</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-083</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="DBA thermal analysis for Tokamak Core Assembly passive cooling">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Analysis against validated model is the standard evidence path for passive nuclear safety functions. The 72-hour threshold and 1 mSv dose limit are the quantified pass criteria.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-7" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-078</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-082</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Functional test for Tritium Plant DBA isolation within 30 seconds">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="DBA isolation is a SIL-3 function; test evidence on representative hardware is required for the nuclear safety case. The 30-second criterion and ADS activation are the specific measurable pass/fail criteria.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-8" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-018</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-084</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="DBA scenario (c) superconducting magnet quench cascade → SMS passive quench protection">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-018(c) explicitly identifies magnet quench cascade as a DBA; SUB-REQ-084 addresses this by requiring passive energy absorption that removes reliance on active detection for safe energy dissipation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-9" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-019</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-082</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Environmental permitting, Nuclear Installations Act, ISO 14001 EMS decomposed to Tritium Plant">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Tritium Plant is the primary environmental discharge point on site; SYS-REQ-019 regulatory obligations directly apply to tritium atmospheric authorisation conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-10" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-008</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-081</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Seal integrity across all operational modes decomposed to Vacuum System">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-008 specifies the vacuum and seal constraint; the Vacuum System owns the engineering responsibility for vessel boundary maintenance during all modes.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-11" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-018</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-079</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="DBA in-vessel failure and loss-of-cooling (SYS-REQ-018b,d) → Tokamak Core Assembly passive heat removal">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-018(b) and (d) identify in-vessel component failure and loss-of-cooling as explicit DBAs; SUB-REQ-079 addresses the Tokamak Core Assembly response including passive cooling duration and public dose limit.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-12" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-018</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-078</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Tritium release DBA (SYS-REQ-018a) → Tritium Plant automatic isolation">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-018 DBA set item (a) is maximum credible tritium release; SUB-REQ-078 is the direct Tritium Plant response requirement that makes this DBA scenario bounded.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-13" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-018</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-078</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="DBA tritium release pathway decomposed to Tritium Plant isolation requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-018 defines the DBA set; the tritium release scenario directly drives Tritium Plant automatic isolation. This is the primary radiological control mechanism for the worst-case DBA.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-14" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-076</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-081</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Vacuum seal qualification → three-condition helium leak test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-081 proves seal integrity across all operational modes required by SUB-REQ-076 using ISO 20485 leak testing methodology.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-15" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-075</SPEC-OBJECT-REF></SOURCE>
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        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Vacuum pump N+1 redundancy → pump failover pressure test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-080 demonstrates that standby pump activation from SUB-REQ-075 maintains torus pressure below 5e-6 Pa within the required 60-second window.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
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      <SPEC-RELATION IDENTIFIER="rel-16" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-074</SPEC-OBJECT-REF></SOURCE>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="SMS MPS redundancy → MPS converter failover FAT">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-079 demonstrates N+1 converter redundancy from SUB-REQ-074 maintains magnet current within tolerance during single module failure at factory.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-17" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-073</SPEC-OBJECT-REF></SOURCE>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="RHS redundancy req → RHS failover integration test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-078 demonstrates that dual-path control architecture from SUB-REQ-073 sustains operations through primary station loss under live in-vessel conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-18" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-008</SPEC-OBJECT-REF></SOURCE>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS seal leak rate → SUB seal qualification programme">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-008 mandates per-seal leak rate below 1e-9 Pa m3/s; SUB-REQ-076 decomposes this to the specific qualification test programme across all operational modes.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-19" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-008</SPEC-OBJECT-REF></SOURCE>
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        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS vacuum integrity → SUB pump N+1 redundancy">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-008 requires maintaining ultra-high vacuum in all operational modes; SUB-REQ-075 ensures single pump failure does not breach the base pressure requirement.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-20" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-006</SPEC-OBJECT-REF></SOURCE>
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        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS magnet quench management → SUB MPS N+1 redundancy">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-006 requires safe management of magnet quench events; SUB-REQ-074 provides the MPS redundancy that allows continued plasma operation through single converter failure without triggering uncontrolled quench.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-21" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-009</SPEC-OBJECT-REF></SOURCE>
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        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS remote handling capability → SUB RHS dual-path control redundancy">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-009 requires RHS to replace all in-vessel components; SUB-REQ-073 provides the failover mechanism ensuring capability is maintained even when primary control station is lost.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-22" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:STK-REQ-017</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-020</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK research data sharing → SYS FAIR data publication requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-020 implements the 30-day data sharing timeline from STK-REQ-017 with specific FAIR data principles.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-23" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:STK-REQ-013</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-019</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK environmental discharge limits → SYS environmental permitting">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-019 implements the stakeholder requirement for environmental permitting compliance, specifying the regulatory framework and EMS certification.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-24" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:STK-REQ-003</SPEC-OBJECT-REF></SOURCE>
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        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK safety case requirement → SYS DBA and basic safety levels">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-018 decomposes STK-REQ-003 by specifying the four DBA categories and quantified dose limit for the nuclear safety case.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-25" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:STK-REQ-010</SPEC-OBJECT-REF></SOURCE>
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        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK 24-hour grid notification → SYS grid scheduling notification requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-017 directly implements the stakeholder need for advance notification to National Grid, decomposing the timing and threshold parameters from the STK intent.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-26" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-121</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-126</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ALARA radiation protection verification">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="REQ-126 verifies ALARA engineering measures through commissioning survey and design inspection.">
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          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-27" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-120</SPEC-OBJECT-REF></SOURCE>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
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          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Magnet quench detection architecture verification">
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          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="REQ-125 verifies vote-2-of-3 quench detection logic and energy dump timing for the magnet system.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-28" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-119</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-124</SPEC-OBJECT-REF></TARGET>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Tritium plant dual-barrier verification">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="REQ-124 verifies dual confinement barrier integrity and isolation timing for the Tritium Plant.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-29" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-118</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-123</SPEC-OBJECT-REF></TARGET>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Cryogenic plant redundancy verification">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="REQ-123 verifies the N+1 redundancy and hot-swap capability of the Cryogenic Plant.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-30" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-117</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-122</SPEC-OBJECT-REF></TARGET>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VSPMS power budget verification">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="REQ-122 is the verification activity for the VSPMS power budget requirement REQ-117.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-31" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-043</SPEC-OBJECT-REF></SOURCE>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ALARA engineering measures derive from radiobiological protection system requirement">
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          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="REQ-121 decomposes SYS-REQ-016's ALARA mandate into engineering-actionable subsystem constraints: specific dose thresholds, remote handling coverage, and individual dose tracking.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-32" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-006</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-120</SPEC-OBJECT-REF></TARGET>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Magnet quench detection redundancy derives from quench management system requirement">
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          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Vote-2-of-3 quench detection architecture and 10s dump timing directly decompose SYS-REQ-006's requirement to detect and safely manage quench events. REQ-120 specifies the subsystem architecture needed to achieve the system-level function.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
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        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-33" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-005</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-119</SPEC-OBJECT-REF></TARGET>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Tritium dual-barrier failsafe derives from tritium confinement system requirement">
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          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Dual confinement barriers and 500ms isolation are the subsystem implementation of SYS-REQ-005's two independent containment barriers requirement. REQ-119 exists because SYS-REQ-005 exists; without this parent the requirement would have no stakeholder-traced basis.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-34" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-010</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-118</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Cryogenic N+1 redundancy derives from campaign availability requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="N+1 cryogenic redundancy is required to achieve the ≥50% campaign availability in SYS-REQ-010; without redundancy, a single compressor failure forces a magnet warm-up and multi-week recovery, directly consuming campaign availability budget.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-35" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-008</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-117</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VSPMS power continuity derives from vacuum system operational requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Power budget and UPS continuity for the VSPMS directly derives from SYS-REQ-008: maintaining ultra-high vacuum requires uninterrupted pressure monitoring; loss of monitoring capability during burn is equivalent to loss of the vacuum boundary function.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-36" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-105</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-001</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for IFC-REQ-010">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test or inspection procedure demonstrating IFC-REQ-010 interface compliance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-37" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-108</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-003</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for IFC-REQ-013">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test or inspection procedure demonstrating IFC-REQ-013 interface compliance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-38" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-109</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-005</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for IFC-REQ-014">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test or inspection procedure demonstrating IFC-REQ-014 interface compliance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-39" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-106</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-002</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for IFC-REQ-011">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test or inspection procedure demonstrating IFC-REQ-011 interface compliance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-40" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-107</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-004</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for IFC-REQ-012">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test or inspection procedure demonstrating IFC-REQ-012 interface compliance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-41" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-112</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-009</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for IFC-REQ-017">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test or inspection procedure demonstrating IFC-REQ-017 interface compliance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-42" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-113</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-008</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for IFC-REQ-018">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test or inspection procedure demonstrating IFC-REQ-018 interface compliance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-43" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-110</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-007</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for IFC-REQ-015">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test or inspection procedure demonstrating IFC-REQ-015 interface compliance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-44" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-111</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-006</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for IFC-REQ-016">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test or inspection procedure demonstrating IFC-REQ-016 interface compliance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-45" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-114</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-010</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for IFC-REQ-019">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test or inspection procedure demonstrating IFC-REQ-019 interface compliance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-46" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-115</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-011</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for IFC-REQ-020">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test or inspection procedure demonstrating IFC-REQ-020 interface compliance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-47" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-103</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-023</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for SUB-REQ-058">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test procedure demonstrating SUB-REQ-058 compliance under design conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-48" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-102</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-057</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for SUB-REQ-057">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test procedure demonstrating SUB-REQ-057 compliance under design conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-49" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-101</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-056</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for SUB-REQ-056">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test procedure demonstrating SUB-REQ-056 compliance under design conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-50" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-100</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-055</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for SUB-REQ-055">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test procedure demonstrating SUB-REQ-055 compliance under design conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-51" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-099</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-042</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for SUB-REQ-054">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test procedure demonstrating SUB-REQ-054 compliance under design conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-52" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-098</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-041</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for SUB-REQ-053">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test procedure demonstrating SUB-REQ-053 compliance under design conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-53" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-097</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-040</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for SUB-REQ-052">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test procedure demonstrating SUB-REQ-052 compliance under design conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-54" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-096</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-039</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for SUB-REQ-051">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test procedure demonstrating SUB-REQ-051 compliance under design conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-55" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-104</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-024</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for SUB-REQ-059">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test procedure demonstrating SUB-REQ-059 compliance under design conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-56" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-083</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-012</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for SUB-REQ-007">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test procedure demonstrating SUB-REQ-007 compliance under design conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-57" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-084</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-013</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for SUB-REQ-008">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test procedure demonstrating SUB-REQ-008 compliance under design conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-58" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-090</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-016</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for SUB-REQ-011">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test procedure demonstrating SUB-REQ-011 compliance under design conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-59" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-091</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-018</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for SUB-REQ-012">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test procedure demonstrating SUB-REQ-012 compliance under design conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-60" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-092</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-017</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for SUB-REQ-013">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test procedure demonstrating SUB-REQ-013 compliance under design conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-61" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-093</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-029</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for SUB-REQ-014">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test procedure demonstrating SUB-REQ-014 compliance under design conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-62" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-089</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-015</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for SUB-REQ-010">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test procedure demonstrating SUB-REQ-010 compliance under design conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-63" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-094</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-037</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for SUB-REQ-049">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test procedure demonstrating SUB-REQ-049 compliance under design conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-64" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-095</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-038</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for SUB-REQ-050">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test procedure demonstrating SUB-REQ-050 compliance under design conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-65" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-088</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-014</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for cryo plant 4.5K stability">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-122 specifies the single-train degraded operation test that demonstrates SUB-REQ-009 compliance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-66" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-082</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-076</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for degraded-mode subsystem requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test procedure that demonstrates the failure-mode requirement is met under degraded operating conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-67" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-081</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-075</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for degraded-mode subsystem requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test procedure that demonstrates the failure-mode requirement is met under degraded operating conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-68" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-080</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-074</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for degraded-mode subsystem requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test procedure that demonstrates the failure-mode requirement is met under degraded operating conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-69" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-079</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-073</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for degraded-mode subsystem requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test procedure that demonstrates the failure-mode requirement is met under degraded operating conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-70" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-078</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-072</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Verification test for degraded-mode subsystem requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="This VER entry specifies the test procedure that demonstrates the failure-mode requirement is met under degraded operating conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-71" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-044</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-076</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Degraded-mode requirement derived from nominal performance requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The failure-mode requirement specifies minimum acceptable behaviour when the nominal capability is partially unavailable; it derives from the parent requirement by specialising it to degraded operation conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-72" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-042</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-075</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Degraded-mode requirement derived from nominal performance requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-104 times a complete cassette replacement on the RHS integration facility and verifies 2mm docking accuracy, the two acceptance criteria in SYS-REQ-009">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-008 ultra-high vacuum integrity verified by VER-REQ-103 pump-down and leak test">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-103 tests base pressure and He leak rate at the vessel level, directly verifying the two acceptance criteria in SYS-REQ-008 (&lt; 1×10⁻⁶ Pa and &lt; 1×10⁻⁹ Pa·m³/s)">
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          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
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      <SPEC-RELATION IDENTIFIER="rel-417" LAST-CHANGE="2026-04-24T20:42:29.437Z">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS tritium confinement → SUB Tritium Plant Category 1 confinement building">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Double-barrier tritium confinement requires the physical building to be the outer confinement barrier: Category 1 nuclear seismic construction, secondary containment, and 600 mm wall thickness are the physical implementation of the second confinement barrier for the tritium plant, which handles up to 100 g tritium inventory.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
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      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-418" LAST-CHANGE="2026-04-24T20:42:29.437Z">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS power conversion function → SUB PCS dedicated turbine hall">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="A 100+ MW steam turbine-generator set (required by SYS-REQ-002 for ≥100 MW net output at ≥25% efficiency) is a large rotating machine requiring a dedicated structural building with ≥15 kN/m² floor loading to support machinery weight and manage vibration, thermal, and acoustic loads away from nuclear buildings.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
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        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
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      <SPEC-RELATION IDENTIFIER="rel-419" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-005</SPEC-OBJECT-REF></SOURCE>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS tritium confinement → SUB ISS emergency isolation">
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      <SPEC-RELATION IDENTIFIER="rel-420" LAST-CHANGE="2026-04-24T20:42:29.437Z">
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        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS tritium confinement → SUB ISS power specification">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="ISS power supply specification (415 V AC, 350 kW continuous, 30-min UPS) is quantitatively derived from the tritium confinement requirement: UPS duration and power budget are sized to safely shut down cryogenic distillation columns while tritium inventory remains below hazardous release threshold.">
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        </VALUES>
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      </SPEC-RELATION>
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        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:ARC-SUB-011</SPEC-OBJECT-REF></SOURCE>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="motivates">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="PCS five-component decomposition supports ≥100MW net electrical output SYS requirement">
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          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC-SUB-011 separates steam generators from the turbine-generator to allow independent thermal optimisation, which is the architectural basis for achieving ≥25% gross-to-net efficiency required by SYS-REQ-002">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-422" LAST-CHANGE="2026-04-24T20:42:29.437Z">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="motivates">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="RHS five-component decomposition supports in-vessel remote maintenance SYS requirement">
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          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC-SUB-010 separates IVIMM from Transfer Cask as independent failure domains, which is the architectural basis for the 21-day divertor replacement window and contamination control boundary required by SYS-REQ-009">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-423" LAST-CHANGE="2026-04-24T20:42:29.437Z">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="motivates">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Cryo Plant four-component decomposition decision supports quench management SYS requirement">
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          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC-SUB-009 separates refrigeration machinery from distribution infrastructure, enabling the independent quench energy dump path required by SYS-REQ-006 — the Helium Refrigeration System isolation valve arrangement was determined by this decomposition">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-424" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-045</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-036</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="PCS turbine runback to 20% load within 60s on disruption signal verified by hardware test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Hardware turbine-governor test validates the 60-second runback window, no-trip constraint, and grid connection preservation specified in SUB-REQ-045">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-425" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-044</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-035</SPEC-OBJECT-REF></TARGET>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Steam generator ≥500 MWth heat transfer and ≤180°C primary outlet verified under plasma operation">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Enthalpy balance measurement at actual Q≥5 plasma conditions directly validates the ≥500 MWth duty and ≤180°C primary outlet temperature limits in SUB-REQ-044">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-426" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-043</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-034</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="PCS grid code CC.6 compliance verified by witnessed measurement at 400kV metering point">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Live 400kV grid connection test directly validates the voltage, frequency and THD parameters in SUB-REQ-043 and provides National Grid ESO sign-off evidence">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
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      <SPEC-RELATION IDENTIFIER="rel-427" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-040</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-033</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="RHS fault halt ≤500ms and 30-minute load hold verified by hardware fault injection">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Hardware fault injection testing validates the ≤500 ms halt response and 30-minute no-drift joint hold specified in SUB-REQ-040 under all five fault types">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-428" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-039</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-032</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Transfer Cask biological shielding ≤2 mSv/hr verified by calibrated gamma survey">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The calibrated gamma survey at 0.1m per ISO 2919 directly validates the ≤2 mSv/hr outer surface dose rate specified in SUB-REQ-039">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-429" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-038</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-031</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="RHS radiation hardening verified by Co-60 + neutron irradiation acceptance test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The irradiation test directly validates the 1×10^6 Gy cumulative dose tolerance and &lt;10% positioning degradation specified in SUB-REQ-038">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-430" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-029</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-030</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Radiation Protection System zoning classification verified by full-plant dose rate survey">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-024 tests the zone boundary dose rates and signage for all plant areas classified per SUB-REQ-014 on the as-built plant with shielding installed">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-431" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-017</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-027</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Vacuum System pump-down to 1e-7 Pa base pressure verified after vessel bakeout">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-023 tests the pump-down duration and base pressure (≤1×10⁻⁷ Pa) specified in SUB-REQ-013 after vessel bakeout conditioning">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-432" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-018</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-028</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="RHS divertor cassette 21-day replacement schedule verified by full-scale test facility">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-022 tests end-to-end divertor cassette replacement cycle time against the ≤21 calendar day window specified in SUB-REQ-012">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-433" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-016</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-026</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="PCS steam turbine 100MW net export verified by sustained full-power plasma operation">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-021 tests net electrical export ≥100MW at 400kV/50Hz during sustained plasma operation as specified in SUB-REQ-011">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-434" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-015</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-025</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Tritium accountability ±1g uncertainty verified by integrated commissioning inventory test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-019 tests tritium mass balance closure within ±1g measurement uncertainty across all processing loops required by SUB-REQ-010">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-066 tests the complete blanket exchange workflow including positioning, which verifies both the 90-day campaign allocation in SUB-REQ-037 and the end-to-end system integration of all RHS components.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-454" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-010</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-045</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Turbine runback derives from operational availability requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-045 prevents turbine trip on plasma disruption, preserving plant availability required by SYS-REQ-010. Each avoided turbine trip saves ~4 hours of restart time; at ~12 disruptions per year, runback capability contributes ~5% availability improvement toward the ≥50% target.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-455" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-002</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-044</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Steam generator heat transfer derives from electrical output requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-044 specifies the heat transfer duty required to drive the Rankine cycle that achieves the ≥100 MW net output in SYS-REQ-002. Without ≥500 MWth transfer, the turbine cannot produce sufficient steam flow for 100 MW net generation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-456" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-009</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-040</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="RHS safe state derives from in-vessel maintenance safety obligation">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-040 addresses the failure mode of suspended in-vessel loads during the maintenance campaign mandated by SYS-REQ-009. The safe state requirement is directly required to safely execute the maintenance operations.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-457" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-009</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-038</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Radiation hardening derives from in-vessel operation requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-038 specifies the radiation environment qualification needed to perform the in-vessel component replacements in SYS-REQ-009. Equipment that cannot survive the in-vessel radiation environment cannot execute the maintenance campaign.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-458" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-041</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-065</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Plasma commissioning power measurement verifies net electrical output">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-065 measures net electrical power at 400 kV metering during actual fusion plasma operation to verify the ≥100 MW constraint in SUB-REQ-041.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-459" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-036</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-064</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Laser tracker positioning test verifies IVIMM accuracy">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-064 uses laser tracker reference measurement across 50 workspace positions to verify the ±1 mm IVIMM end-effector accuracy constraint in SUB-REQ-036.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-460" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:IFC-REQ-036</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-063</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Disruption signal latency test verifies PCS-PCS interface">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-063 uses oscilloscope timing measurement and SCADA disconnection to verify the 100 ms latency and network-independence constraints in IFC-REQ-036.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-461" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:IFC-REQ-035</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-062</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Commissioning electrical test verifies turbine-generator to grid interface">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-062 measures grid-side electrical parameters and transformer losses at commissioning to verify the 22 kV, power factor, and loss constraints in IFC-REQ-035.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-462" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:IFC-REQ-034</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-061</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Pressure test and leak test verify SG primary-secondary boundary">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-061 applies ASME BPVC Section III hydrostatic and helium leak test to verify the tube-to-shell pressure capability and per-tube leak rate constraints in IFC-REQ-034.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-463" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:IFC-REQ-033</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-060</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Video latency test verifies viewing system interface">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-060 measures end-to-end video latency and resolution under radiation to verify the 200 ms and 25 fps constraints in IFC-REQ-033.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-464" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:IFC-REQ-032</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-059</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Helium leak test verifies cask-port docking interface">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-059 uses helium mass spectrometer and structural load test to verify both the contamination isolation and structural loading constraints in IFC-REQ-032.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-465" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:IFC-REQ-031</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-058</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="EtherCAT latency test verifies IVIMM command interface">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-058 directly tests the cycle time and latency constraints in IFC-REQ-031 under simulated radiation, providing pass/fail evidence against the 4 ms and 8 ms interface limits.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-466" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-015</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-043</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Grid code compliance derives from system-level Grid Code mandate">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-043 is the direct subsystem decomposition of SYS-REQ-015, translating the system Grid Code compliance obligation into specific PCS voltage, frequency, and THD parameters at the 400 kV connection point.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-467" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-002</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-042</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Rankine efficiency derives from gross-to-net efficiency system requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-042 allocates the ≥25% gross-to-net efficiency mandate from SYS-REQ-002 to the thermodynamic design of the Rankine cycle. The 25% constraint flows directly from the system efficiency requirement.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-468" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-002</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-041</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Net electrical output requirement derives from 100 MW system target">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-041 is the direct subsystem decomposition of SYS-REQ-002 net electrical output mandate, specifying that the PCS must deliver exactly the system-level target at the grid connection point.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-469" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-009</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-039</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Transfer cask shielding derives from personnel access during maintenance">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The transfer cask enables the 4-month maintenance campaign by allowing safe human-supervised transport of irradiated modules. Without compliant cask shielding, the campaign cannot proceed, making this a direct derivation from SYS-REQ-009.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-470" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-009</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-037</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Campaign duration derives from 4-month system maintenance window">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-037 allocates 90 of the 120-day campaign window to blanket exchange, deriving from the SYS-REQ-009 4-month total maintenance campaign constraint.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-471" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-009</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-036</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IVIMM accuracy derives from system positioning accuracy requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-036 allocates half the ≤2 mm system accuracy budget from SYS-REQ-009 to the manipulator, with the remaining 1 mm allocated to tooling alignment. This is the direct decomposition of the system-level accuracy requirement into the primary moving component.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-472" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:IFC-REQ-030</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-057</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Post-quench test verifies HMS-HRS gas supply interface">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="TF coil field strength verified by Hall probe measurement at rated current on coil test facility">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Disruption mitigation response verified by firing MMI and measuring injection latency on test bench">
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          </ATTRIBUTE-VALUE-STRING>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Vacuum maintenance derives to pressure monitoring interface to PCS">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-027 specifies the data interface that allows the PCS to use vacuum measurement data for plasma operations control, and the interlock that allows vacuum events to stop plasma — both required to maintain SYS-REQ-008 vacuum integrity.">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-029 specifies the pump pressure performance that directly delivers the &lt;1e-6 Pa vessel pressure in SYS-REQ-008. The 24-hour pump-down time is the operational metric that drives availability.">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
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          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Quench management derives to QDPS-MPSS interlock interface">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-024 specifies the hardwired signal path that is the physical implementation of the quench interlock function required by SYS-REQ-006 to limit hot-spot temperature.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
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        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
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          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="TBR requirement derives to blanket tritium extraction interface">
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          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-023 defines the interface through which tritium extracted from the blanket flows to the Tritium Plant, directly enabling the TBR &gt;= 1.1 system requirement. Without this interface specification, the extraction efficiency cannot be guaranteed.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-513" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-006</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:ARC-REQ-007</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS quench management drives SMS architecture separation decision">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The SIL-2 requirement in SYS-REQ-006 motivates the architectural decision in ARC-REQ-007 to separate QDPS from MPSS with a hardwired interlock, ensuring the safety function is independent of control software.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-514" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-018</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-043</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Tritium Plant SUB requirement verified by end-to-end commissioning test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-043 tests the integrated fuel cycle performance specified in the Tritium Plant subsystem requirements through full-scale commissioning.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-515" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-023</SPEC-OBJECT-REF></SOURCE>
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        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="QDPS quench detection verified by resistive voltage injection test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-044 directly tests the 100mV threshold and 10ms/50ms timing specified in SUB-REQ-023 by injecting a calibrated resistive signature into the coil monitoring circuit.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-516" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-006</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-028</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Quench management derives to TF thermal margin specification">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Maintaining 1.5 K thermal margin in SUB-REQ-028 is a proactive quench prevention measure supporting SYS-REQ-006. Insufficient margin causes inadvertent quenches from disruption-induced heating, triggering the quench management chain unnecessarily and reducing availability.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-517" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-001</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-026</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Plasma burn derives to MPSS energisation performance">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The MPSS ramp-up time and current accuracy in SUB-REQ-026 directly determine how quickly plasma operations can begin and whether field noise will degrade plasma confinement required by SYS-REQ-001.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-518" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-001</SPEC-OBJECT-REF></SOURCE>
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        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Plasma burn derives to CS flux swing specification">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The CS flux swing of 100 Vs is the ohmic drive that initiates and sustains plasma current, enabling the plasma conditions required for Q&gt;=5 burn in SYS-REQ-001. Without sufficient flux swing, plasma current cannot be maintained long enough for the required burn pulse.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-519" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:IFC-REQ-026</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-048</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="QDPS-TF voltage tap interface verified by bandwidth and impedance test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-048 measures voltage tap bandwidth and input impedance — the two parameters in IFC-REQ-026 that determine whether the quench detection threshold can be reliably achieved.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-520" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:IFC-REQ-025</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-047</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="MPSS-TF power interface verified by instrumented ramp test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-047 measures all parameters specified in IFC-REQ-025 during operational ramp-up, including current accuracy and GOOSE message rate.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-521" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-027</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-046</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="MPSS energy extraction verified by timed interlock test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-046 directly measures the &lt;5ms loop opening time and &lt;500 A/s decay rate specified in SUB-REQ-027 under realistic coil current conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-522" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-025</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-045</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="TF field performance verified by Hall probe measurement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-045 directly tests the 3.2 T field and 1% ripple specified in SUB-REQ-025 by physical measurement at the plasma axis and separatrix positions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-523" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-001</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-025</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Plasma burn Q&gt;=5 derives to TF field performance specification">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="TF field of 3.2 T on-axis is the magnetic confinement parameter that enables the Q&gt;=5 burn required by SYS-REQ-001. Field ripple below 1% prevents fast-ion losses that would degrade fusion gain below the required threshold.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-524" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-006</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-027</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS quench management derives to MPSS energy extraction response">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-027 specifies the power supply safe-state response that is the physical complement of the detection function in SUB-REQ-023 — together they form the complete quench management chain required by SYS-REQ-006.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-525" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-006</SPEC-OBJECT-REF></SOURCE>
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        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS quench management derives to QDPS detection specification">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-023 specifies the voltage threshold and timing that delivers the system-level quench management capability in SYS-REQ-006. The 10ms detection window and 50ms discharge time are the key performance parameters that determine hot-spot temperature.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-526" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-006</SPEC-OBJECT-REF></SOURCE>
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        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Quench detection timing derives from quench safe management system requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-006 requires safe management of superconducting quench events. SUB-REQ-023 provides the specific detection and protection parameters that implement this at component level for the QDPS.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-527" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-022</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-040</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ADS safety function test verifies SUB-REQ-022">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-040 exercises the complete ADS safety chain (detect, actuate, clean) under representative conditions, which is the only way to verify the SIL 3 safety function end-to-end.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-528" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-018</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-039</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="PEPS throughput test verifies SUB-REQ-018">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-039 tests the PEPS at full design throughput with mass spectrometry measurements — the only way to verify that the separation efficiency meets the decontamination factor requirement at rated flow.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-529" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:IFC-REQ-022</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-042</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Integration test verifies ISS-TSDS batch transfer compliance">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-022 specifies batch transfer latency and purity. VER-REQ-042 tests these directly during fuel cycle commissioning.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-530" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:IFC-REQ-021</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-041</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
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          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Integration test verifies PEPS-ISS interface compliance">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-021 specifies He, H2O purity limits and pressure range. VER-REQ-041 tests exactly these parameters at the integration boundary during commissioning. The test is necessary and sufficient to verify interface compliance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-531" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-003</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-021</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
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          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="BTES extraction rate derives from TBR &gt;= 1.1 system requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-003 requires TBR &gt;= 1.1, meaning at least 10% more tritium must be bred than consumed. BTES must extract all bred tritium promptly for it to contribute to net TBR. A failure to extract would cause bred tritium to remain in the blanket, not in the accountable fuel cycle inventory, reducing effective TBR.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-532" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-005</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-020</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="TSDS double-containment requirement derives from tritium confinement system requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-005 mandates double containment for all tritium. SUB-REQ-020 implements this at the storage system level, specifying double-contained storage beds and the maximum inventory bound that limits radiological consequence.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-533" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-001</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-019</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ISS fuel purity requirement derives from plasma burn sustainment requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-001 requires sustained DT burn. Fuel purity directly affects fusion cross-section; HD and HH isotope contamination above 0.1% measurably reduces fusion reactivity. SUB-REQ-019 specifies the ISS output purity required to sustain ignition-grade plasma.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-534" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-005</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-018</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="PEPS throughput requirement derives from tritium confinement system requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-005 requires tritium within at least two independent containment boundaries. SUB-REQ-018 decomposes this to the PEPS component which forms the first active barrier in the exhaust processing chain. The throughput and separation factor directly implement the system-level confinement requirement.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-535" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:ARC-REQ-006</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-001</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="TCA decomposition rationale informs system plasma burn requirement decomposition">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC-REQ-006 establishes the component structure against which system-level requirements are decomposed">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-536" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-017</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-038</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="FEM electromagnetic analysis and post-disruption leak test for safe state">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-038 uses validated FEM analysis of worst-case halo currents to verify the structural criterion in SUB-REQ-017, with physical commissioning verification">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-537" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-016</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-037</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="MCNP6 neutronics analysis for blanket TBR performance">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-037 uses MCNP analysis validated against ITER blanket test modules to verify the TBR specification in SUB-REQ-016">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-538" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-015</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-036</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Helium leak test and hydrostatic test for vessel integrity">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-036 uses helium leak testing at 1e-8 sensitivity to directly verify the 1e-7 Pa m3/s outgassing criterion in SUB-REQ-015">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-539" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-004</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-017</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Disruption mitigation requirement drives TCA structural safe state specification">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-017 specifies the TCA structural response criterion that is needed for SYS-REQ-004 disruption mitigation — without structural integrity through a disruption, the machine protection function cannot be claimed complete">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-540" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-003</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-016</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="System TBR requirement allocates blanket module breeding performance">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-016 allocates the system-level TBR to the blanket module — it specifies the minimum breeding performance the First Wall and Blanket Module must achieve to satisfy SYS-REQ-003">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-541" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-008</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-015</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="UHV system requirement drives vessel structural leak integrity specification">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-015 exists because SYS-REQ-008 requires UHV — the vessel structural leak tightness specification is the primary TCA contribution to achieving that vacuum level">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-542" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-015</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-010</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Grid Code compliance drives station load import interface specification">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-019 defines the station import interface that SYS-REQ-015 Grid Code compliance requires, including import limit and power quality at the 400 kV connection">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-543" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-004</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-009</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Disruption mitigation requires hardwired RHS lockout during plasma-active state">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-017 implements the machine protection function that SYS-REQ-004 requires — preventing RHS tool damage and contamination if a disruption occurs during a maintenance window">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-544" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-006</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-005</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Quench protection requires coil power supply command and quench alarm interface">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-014 defines the bidirectional command/alarm interface between PCS power systems and SMS that SYS-REQ-006 requires for safe quench energy discharge management">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-545" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-001</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-003</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Plasma burn sustain requirement drives fuel injection command interface">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-013 exists because SYS-REQ-001 requires sustained D-T plasma burn, which necessitates a controlled pellet fuelling interface between PCS and Tritium Plant">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-546" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-005</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-002</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Tritium containment drives exhaust gas transfer interface">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-REQ-011 specifies the exhaust gas handling boundary needed to implement the dual-barrier tritium containment required by SYS-REQ-005">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-547" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-011</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-035</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Integration test for TCA vessel bakeout heating interface">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-035 tests wall temperature uniformity and vacuum recovery from IFC-REQ-020 to confirm first-wall conditioning">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-548" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-010</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-034</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Commissioning test for grid import station load measurement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-034 tests station import power and power quality from IFC-REQ-019 against Grid Code limits">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-549" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-008</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-033</SPEC-OBJECT-REF></TARGET>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Integration test for cryogenic cold heads in vacuum chamber">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-030 demonstrates remote removal and installation of tritium plant internals without manual intervention as required by IFC-REQ-015">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Integration test for coil power supply command and quench alarm relay">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-029 tests current tracking and quench alarm latency from IFC-REQ-014 required for PCS shutdown">
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      <SPEC-RELATION IDENTIFIER="rel-554" LAST-CHANGE="2026-04-24T20:42:29.437Z">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Integration test for PCS pellet injection command interface">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-028 tests pellet velocity, latency, and success rate from IFC-REQ-013 for fuelling control">
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      <SPEC-RELATION IDENTIFIER="rel-555" LAST-CHANGE="2026-04-24T20:42:29.437Z">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Integration test for PCS vacuum neutral gas signal latency and accuracy">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-027 tests the pressure signal path specified in IFC-REQ-012 for MARFE detection">
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      <SPEC-RELATION IDENTIFIER="rel-556" LAST-CHANGE="2026-04-24T20:42:29.437Z">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Integration test for tritiated exhaust gas transfer at vacuum-tritium interface">
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          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-026 tests exhaust gas throughput and tritium capture efficiency from IFC-REQ-011">
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        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
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      <SPEC-RELATION IDENTIFIER="rel-557" LAST-CHANGE="2026-04-24T20:42:29.437Z">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Integration test for LN2 supply to Tritium Plant cryo interface">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-025 tests LN2 temperature and pressure specified in IFC-REQ-010 under representative load">
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        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
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      <SPEC-RELATION IDENTIFIER="rel-558" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-029</SPEC-OBJECT-REF></SOURCE>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="RPS zone classification and interlock timing verified by in-situ measurement">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-024 provides in-situ dose rate measurement and interlock timing test directly verifying zone classification and 100 ms response in the RPS SUB requirement.">
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      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-559" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-006</SPEC-OBJECT-REF></SOURCE>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Material injection delivery quantity and timing verified by bench test">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-014 provides bench test verifying 10e22 atom delivery within 50 ms in SUB-REQ-006 (massive material injection).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-560" LAST-CHANGE="2026-04-24T20:42:29.437Z">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="PCS DAQ synchronisation verified by hardware pulse injection test">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-015 provides the hardware synchronisation test verifying 1 kHz sampling and 1 microsecond timestamp accuracy in SUB-REQ-004 (PCS DAQ).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
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        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-561" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-018</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-028</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="RHS campaign performance verified by full-scale demonstration">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-022 provides full-scale demonstration test verifying 21-day campaign, 2 mm accuracy, and 500-hour MTBF in SUB-REQ-012 (RHS).">
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        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
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      <SPEC-RELATION IDENTIFIER="rel-562" LAST-CHANGE="2026-04-24T20:42:29.437Z">
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        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Vacuum System performance verified by pump-down commissioning test">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-023 provides pump-down and pumping speed tests verifying 1e-6 Pa base pressure and 50 m3/s speed in SUB-REQ-013 (Vacuum System).">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Power Conversion output verified by full-power grid export measurement">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-021 provides full-power export measurement verifying 100 MW net and 25% efficiency in SUB-REQ-011 (Power Conversion).">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="PCS dual-redundant controller switchover verified by fault injection test">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Cryogenic Plant refrigeration capacity verified by cold commissioning">
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        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="TCA first wall heat flux verified by commissioning measurement">
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        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
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      <SPEC-RELATION IDENTIFIER="rel-567" LAST-CHANGE="2026-04-24T20:42:29.437Z">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="SMS field strength and quench protection verified by magnet commissioning">
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      <SPEC-RELATION IDENTIFIER="rel-568" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-015</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:REQ-SESTEPFUSIONPOWERPLANT-025</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Tritium Plant accountancy verified by integrated commissioning test">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-REQ-019 provides integrated CECE test verifying detritiation factor 1e6 and tritium accountancy to within 1 g in SUB-REQ-010 (TRP).">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-569" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:STK-REQ-016</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-005</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="EPZ size driven by maximum credible tritium release limited by containment requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-016 (emergency planning zone with 95% population notification in 15 minutes) is sized by the maximum credible accident source term, which SYS-REQ-005 limits by constraining single-event tritium release to below 0.1 g. The EPZ dimensions are directly derived from the maximum source term and atmospheric dispersion modelling.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-570" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:STK-REQ-018</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-003</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="In-situ blanket measurement validates system-level TBR requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-018 (in-situ TBR measurement) is the verification strategy for SYS-REQ-003 (TBR &gt;= 1.1). The stakeholder requirement for in-situ blanket performance measurement directly derives the system-level TBR measurement requirement, providing the evidence base for confirming tritium self-sufficiency.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-571" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:STK-REQ-014</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-014</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Radioactive waste categorisation need drives reduced-activation materials requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-014 (categorise waste and provide ILW interim storage) derives SYS-REQ-014 (80% waste LLW within 100 years through reduced-activation materials): the design-for-decommissioning requirement is the direct engineering response to the waste categorisation stakeholder need.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-572" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:STK-REQ-013</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-005</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Environmental discharge limits derive tritium containment requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-013 (limit radioactive discharges below Environmental Permitting limits) derives SYS-REQ-005 (tritium double containment and single-event release below 0.1 g): the containment system is the primary mechanism for limiting environmental tritium discharge.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-573" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:STK-REQ-012</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-012</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Radiation zone access control derives system dose rate requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-REQ-012 (radiation zone classification and interlocked access) directly drives SYS-REQ-012 (dose rates in occupied areas below 10 uSv/hr): the interlocked access system enforces the dose rate limit.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-574" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-004</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-013</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="End-to-end integration test verifies SYS-REQ-004 disruption mitigation response">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Only end-to-end test on the integrated PCS hardware and software stack can demonstrate that the 10 ms system response requirement is met. Individual component tests cannot capture inter-component latency introduced at the IFC-REQ-005 interface.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-575" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-005</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-012</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Fault injection demonstration verifies PCS safe state transition">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Full functional chain demonstration from fault injection to plasma termination is required for SIL-3 safe state sign-off per IEC 61508. SUB-REQ-005 pass criteria (1 s to action, 30 s to termination) are directly measured.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-576" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-002</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-011</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Disruption database replay verifies detection probability and latency">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Database replay is the accepted verification method for disruption detection probability where controlled disruptions cannot be induced. Pass criterion (0.99 detection, 10 ms trigger) directly verifies SUB-REQ-002.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-577" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-001</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:VER-REQ-010</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verifies">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Hardware-in-the-loop timing test verifies 1 ms cycle time">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Only hardware-in-the-loop test on production controller can verify real-time timing compliance for SUB-REQ-001; simulation is insufficient for SIL-3.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-578" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-004</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-006</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="System disruption mitigation drives runaway electron suppression injection requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-004 is the parent for all disruption mitigation functions. SUB-REQ-006 specifically addresses H-006 (runaway electrons) which is a post-disruption phase hazard not covered by the current quench detection: the material injection must continue beyond the initial mitigation trigger to suppress runaway amplification.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-579" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-004</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-005</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="System safe plasma termination requirement drives PCS internal fault safe state">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-004 requires plasma disruption initiation within 10 ms for external disruptions. SUB-REQ-005 derives the complementary requirement that a PCS-internal fault also initiates plasma termination, closing the safety case for H-001 hazard regardless of whether the disruption is external or originates in the controller itself.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-580" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-013</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-004</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="System diagnostic specification drives PCS DAQ sampling and synchronisation requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-013 requires 40+ diagnostic systems at calibrated, time-synchronised measurement. SUB-REQ-004 derives the specific PCS-internal implementation: 1 kHz sampling and 1 microsecond synchronisation accuracy needed to support the equilibrium reconstruction algorithm used in the control loop.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-581" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-004</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-003</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SIL-3 disruption mitigation requirement drives PCS dual-redundancy">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-004 is a SIL-3 safety function. SUB-REQ-003 derives from the SIL-3 unavailability target: a single controller without redundancy cannot achieve the required failure probability. Dual lockstep is the minimum architecture that meets this target.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-582" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-004</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-002</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="System disruption mitigation requirement directly derives PCS detection and injection requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-REQ-002 is the PCS-specific realisation of SYS-REQ-004. The 10 ms trigger timing, detection threshold values, and 0.99 detection probability are derived from the system-level disruption budget and H-001 SIL-3 safety integrity target.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-583" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-004</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SUB-REQ-001</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="10 ms system disruption response drives PCS 1 ms control cycle requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-REQ-004 requires disruption mitigation to fire within 10 ms. SUB-REQ-001 exists because achieving this 10 ms system response requires the PCS control cycle to complete sensing, reconstruction, and actuation command in 1 ms, providing a 10x margin for detection latency and communication overhead.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-584" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:ARC-REQ-005</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-005</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Tritium Plant self-contained with double-containment boundary derives tritium confinement requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Architectural decision to implement Tritium Plant as a self-contained subsystem with double containment boundary is the physical realisation of SYS-REQ-005. The sub-atmospheric primary boundary prevents outward leakage; the secondary ventilated enclosure provides the second containment layer required for H-002 mitigation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-585" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:ARC-REQ-004</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-002</SPEC-OBJECT-REF></TARGET>
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkType</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="Power Conversion System thermal architecture drives net electrical output requirement">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkDescription</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The decision to separate thermal extraction from electrical generation in a distinct subsystem creates the conversion efficiency chain. SYS-REQ-002 (100 MW net electrical) derives from this architecture because a combined approach would have worse thermodynamic efficiency.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-linkRationale</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
      </SPEC-RELATION>
      <SPEC-RELATION IDENTIFIER="rel-586" LAST-CHANGE="2026-04-24T20:42:29.437Z">
        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:ARC-REQ-003</SPEC-OBJECT-REF></SOURCE>
        <TARGET><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:SYS-REQ-004</SPEC-OBJECT-REF></TARGET>
        <VALUES>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Breeding ratio ≥1.1 requires tritium extraction from blanket and fuel injection — both flow through the tritium plant-tokamak interface">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Net 100 MW electrical output must be exported to national grid via the 400 kV switchyard interface">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Power conversion drives thermal transport interface">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Converting 500 MW thermal to 100 MW net requires thermal power transport from blanket/divertor to the steam cycle via this coolant interface">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Plasma burn requirement drives magnet-tokamak field interface">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Sustaining Q≥5 burn at 10 MA requires 3-4T toroidal field from the magnet system surrounding the tokamak — this interface delivers the confining field">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Worker dose limit drives neutron shielding requirement">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="20 mSv/yr limit with ALARP target &lt;1 mSv/yr requires dose rates &lt;10 µSv/hr in occupied areas, achieved primarily through neutron streaming control">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Grid connection need drives power quality requirements">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Grid Code compliance at 400 kV is mandatory for delivering the 100 MW to National Grid">
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          </ATTRIBUTE-VALUE-STRING>
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        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Net power output drives conversion efficiency">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="100 MW net from ~500 MW thermal requires ≥25% gross-to-net efficiency after recirculating power for auxiliaries">
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          </ATTRIBUTE-VALUE-STRING>
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        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Net power output drives plasma performance requirement">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="100 MW net requires ~500 MW fusion power, which requires Q≥5 at ~100 MW auxiliary heating">
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      <SPEC-RELATION IDENTIFIER="rel-620" LAST-CHANGE="2026-04-24T20:42:29.437Z">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Automatic tritium isolation drives containment architecture">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="30s auto-isolation is one mechanism within the double-barrier containment strategy; &lt;0.1g release limit is shared">
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        <SOURCE><SPEC-OBJECT-REF>uht-bot:se-step-fusion-power-plant:STK-REQ-007</SPEC-OBJECT-REF></SOURCE>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="TBR ≥1.1 is the quantification of the closed fuel cycle need — breeding must exceed consumption plus losses for self-sufficiency">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Remote handling need drives system-level RH specification">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="All in-vessel components must be remotely replaceable because dose rates &gt;10 Sv/hr preclude human entry; system-level spec quantifies accuracy and campaign duration">
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        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="derives">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Tritium accountability drives breeding ratio measurement">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="Accountancy to ±0.1g requires precise breeding measurement — TBR ≥1.1 must be verified by in-situ measurement to close the accountancy loop">
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        <TYPE><SPEC-RELATION-TYPE-REF>trace-link-type</SPEC-RELATION-TYPE-REF></TYPE>
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