System

Industrial Elevator Control System — session 450, addressing two quality gate blockers from the prior validation pass: one orphan requirement (orphans 1 > 0) and one high-severity lint finding (lintHigh 1). Both concern the {{entity:Power Distribution Subsystem}}, the IP54-rated machine-room assembly comprising the UPS module, ARD battery bank, busbar assembly, and isolation contactors.

Project state at entry: 201 requirements, 191 trace links, 15 baselines, DECOMPOSITION_STATUS validated.

Verification Audit

The orphan was {{sub:SUB-REQ-073}}: “The Power Distribution Subsystem SHALL be housed in a dedicated IP54-rated… steel enclosure.” Inspection confirmed this requirement was created in the prior session specifically to address the high-severity lint finding that the power distribution subsystem entity ({{hex:54F51018}}) lacked {{trait:Physical Object}} despite requirements imposing physical constraints. The requirement existed and was correct, but had no trace link — a linkset error from the prior session.

Fix applied: trace link created from {{sys:SYS-REQ-015}} (IP54 machine-room cabinet) → {{sub:SUB-REQ-073}}, with description documenting that SYS-REQ-015 sets the system-level enclosure constraint and SUB-REQ-073 decomposes it to the Power Distribution Subsystem’s dedicated cabinet. Orphan count dropped from 1 to 0.

Scenario Validation

The high-severity lint finding — “power distribution subsystem lacks Physical Object trait but has physical embodiment” affecting {{sub:SUB-REQ-066}} — was addressed by reclassifying both substrate entities for the Power Distribution Subsystem.

flowchart TB
  SYS15["SYS-REQ-015 IP54 cabinet in machine room"]
  SUB55["SUB-REQ-055 Controller cabinet enclosure"]
  SUB73["SUB-REQ-073 PDS dedicated enclosure"]
  SUB66["SUB-REQ-066 ARD battery bank 2.5 kWh"]
  PDS["Power Distribution Subsystem 54F51018 → DE851018"]
  SYS15 --> SUB55
  SYS15 --> SUB73
  SUB73 --> PDS
  SUB66 --> PDS

{{entity:power distribution subsystem}} was reclassified from {{hex:54F51018}} to {{hex:DE851018}}, adding {{trait:Physical Object}}, {{trait:Structural}}, {{trait:Physical Medium}}, and {{trait:Regulated}} traits — correctly reflecting the steel enclosure assembly with machine-room mounting constraints. The AIRGen lint concept cache, however, maintains its own UHT classification independently of the substrate entity graph. After reclassification, quality score re-run, and adding an explicit ARC record about the PDS physical form factor (later removed as it created a new orphan outside any valid linkset), the lint continued to resolve “power distribution subsystem” to 54F51018. This is a confirmed toolchain limitation: AIRGen’s concept cache does not sync from substrate in real time.

Mode Coverage

No mode coverage gaps were introduced or resolved this session. The focus was purely on the two quantitative blockers.

Cross-Domain Findings

Prior session VALIDATION_FINDING facts for the {{entity:Nuclear Safety Interlock}} analog (hex 50F77859) remain unresolved: the nuclear system specifies a proof test interval for SIL-3 PFD maintenance, which the elevator safety case (H-001, H-002, H-007) lacks. This is a residual gap from the prior validation session, not in scope for this blocker-resolution session.

Gaps Closed

One gap fully resolved: {{sub:SUB-REQ-073}} trace link to {{sys:SYS-REQ-015}} — orphan blocker cleared.

One gap partially resolved: {{entity:Power Distribution Subsystem}} entity reclassified in substrate ({{hex:54F51018}} → {{hex:DE851018}}, Physical Object trait confirmed). Lint finding persists due to AIRGen concept cache staleness; the underlying engineering concern — that the PDS is a physical assembly requiring dimensional and environmental protection verification — is documented in {{sub:SUB-REQ-073}}.

Verdict

Partial pass. Orphan blocker resolved (0/201). High-severity lint finding persists as a toolchain artifact: AIRGen’s concept registry caches “power distribution subsystem” at {{hex:54F51018}} independently of the substrate entity graph, and no available CLI command invalidates this cache entry. The engineering concern has been addressed. Baseline BL-SEINDUSTRIALELEVATOR-016 captures current state. Next session should investigate whether a proof test interval requirement for SIL-3 subsystems (H-001/H-002/H-007) can clear the residual safety argument gap from the prior validation pass.