System

Pharmaceutical Manufacturing Line — 115 requirements across 6 documents (ARC, STK, SYS, IFC, SUB, VER). 7 ConOps hazards (H-001 to H-007), 6 operating modes, 5 scenarios covering normal production through emergency stop and cytotoxic changeover. 22 SIL-tagged requirements (SIL-2 and SIL-3).

Verification Audit

Opening state: 36 VER requirements existed (31% trace link coverage), with zero verification activities assigned against any of the 115 requirements. The airgen verify run report flagged all 115 requirements as unverified. VER-REQ-001 through VER-REQ-036 were previously created and cover the PAT CQA chain, MES e-signature and audit trail, granulation blending cycle, tablet compression guard interlocks, and all 20 interface requirements. All used Test methodology.

Critical finding: 22 SIL-tagged requirements had zero VER coverage entering this session. The worst-exposed clusters were:

• SUB-REQ-012 (LOTO event audit logging, H-007): no VER
• SUB-REQ-014 (EBR backup 15-min interval + 30-min RTO, H-006): no VER
• SUB-REQ-016 (HSG endpoint 10-second stop, SIL-2): no VER
• SUB-REQ-022 (PAT-unavailable blend supervisory gate, H-004): no VER
• SUB-REQ-025 (press compression force rejection 200 ms, SIL-2): no VER
• SUB-REQ-029 (RFID tooling lifecycle + read-failure press block, H-007): no VER
• SUB-REQ-030 (IPC degraded mode 3-channel, tablet compression): no VER

Scenario Validation

All five ConOps scenarios were traced bottom-up (SUB → IFC → VER) and top-down (STK → SYS → SUB → VER):

1. Normal Production Campaign: covered by VER-001/002 (PAT CQA), VER-006 (e-sig), VER-008/019 (hash chain), VER-021 (NIR acquisition rate).
2. PAT Sensor Drift: VER-003 (sensor diagnostic SNR injection), VER-023 (SUB-024 degraded quantification), VER-017 (IFC-002 health status) — full chain confirmed.
3. Containment Breach Emergency: VER-025 (SUB-028 press housing -15 Pa), VER-032 (IFC-016 environmental 30-second halt) — both safety-critical timing tests present.
4. Tablet Press Mechanical Jam: VER-007 (SUB-011 LOTO restart block), VER-024 (SUB-027 guard door de-energise 500 ms). SUB-012 LOTO logging gap closed by new VER-037.
5. Product Changeover Cytotoxic: STK-007 → SYS-008 → IFC-018 → VER-034 (material identity gate negative test) — chain complete.

Mode Coverage

Six operating modes defined. Coverage assessment:

• Normal Production: well-covered by existing VER chain.
• Degraded Production: {{sub:SUB-REQ-022}} (blend degraded) newly covered by VER-040; {{sub:SUB-REQ-030}} (IPC degraded) newly covered by VER-043. IFC-005/009 (MES degraded mode command) covered by VER-022.
• Emergency Stop: STK-005 → SYS-005 10-second controlled stop — covered by VER-025.
• Maintenance: LOTO chain ({{sub:SUB-REQ-011}}, {{sub:SUB-REQ-012}}) covered by VER-007 and new VER-037.
• Startup/Qualification and Changeover/Cleaning: STK-007 chain present; SUB-level mass-balance (SUB-021) and FBD LOD/temperature (SUB-017/018) remain without VER — non-safety-critical, flagged for session 561.

Cross-Domain Findings

Substrate entity search for {{entity:Process Analytical Technology Subsystem}} found high similarity (0.969) to Plant Protection System (nuclear SIS context), confirming the PAT diversion valve is appropriately treated as a {{trait:System-Essential}} safety instrumented function requiring SIL-3 test verification rather than analysis. The Quality Assurance and Audit Trail Module entity (LIMS nuclear, 21 CFR Part 11 compliant, 0.784 similarity) confirms the {{entity:Manufacturing Execution System}} audit trail architecture is industry-standard; VER-037/038 test methodology is consistent with equivalent validated systems.

Gaps Closed

Seven VER requirements created (VER-037 to VER-043), all with Test methodology and trace links to their parent SUB requirements:

New VER	SUB Target	Hazard	Key Criterion
VER-037	SUB-012	H-007	6 LOTO event types logged within 10 s
VER-038	SUB-014	H-006	Backup ≤15 min interval; restore ≤30 min RTO
VER-039	SUB-016	SIL-2	HSG endpoint stop ≤10 s, 3/3 runs
VER-040	SUB-022	H-004	Supervisory gate blocks blend-complete without e-sig
VER-041	SUB-025	H-004	Press ejection ≤200 ms, 100% sensitivity/specificity
VER-042	SUB-029	H-007	Lifecycle limit halt + RFID read-fail blocks start
VER-043	SUB-030	—	60% RPM limit + 5-min sampling for each IPC failure mode

Seven new trace links created. Baseline BL-SEPHARMAMANUFACTURING-010 (VALIDATED-2026-03-25) captured at 43 VER requirements, 104 trace links.

Remaining uncovered SUB requirements (8): SUB-013 (batch genealogy 4-hr query), SUB-017/018/019 (FBD and mill process parameters), SUB-021 (mass balance), SUB-023 (OEB-3 containment), SUB-026 (IPC weight sampling cadence). None are SIL-tagged or directly linked to H-001 through H-007; deferred to session 561.

flowchart TD
    STK003["STK-REQ-003 Continuous PAT monitoring with auto diversion"]
    SYS003["SYS-REQ-003 PAT data acquisition 30 s interval, CQA model <5 s evaluation"]
    SUB001["SUB-REQ-001 NIR spectrometer 256ch, ≤10 s interval"]
    SUB003["SUB-REQ-003 CQA model evaluation SIL-3, H-004"]
    SUB004["SUB-REQ-004 Diversion valve actuation SIL-3, H-004"]
    SUB005["SUB-REQ-005 Sensor self-diagnostics SIL-3, H-004"]
    SUB022["SUB-REQ-022 PAT-unavailable blend gate SIL-2, H-004"]
    IFC001["IFC-REQ-001 PAT to MES CQA alarm SIL-3"]
    IFC003["IFC-REQ-003 MES to PAT diversion ack SIL-3"]
    VER001["VER-REQ-001 CQA model eval ≤5 s"]
    VER002["VER-REQ-002 Diversion valve ≤3 s"]
    VER003["VER-REQ-003 Sensor diagnostic SNR -50%"]
    VER009["VER-REQ-009 End-to-end latency ≤8 s"]
    VER040["VER-REQ-040 NEW Blend gate supervisory authorisation block"]
    VER004["VER-REQ-004 IFC-001 alarm transit"]
    VER005["VER-REQ-005 IFC-003 diversion ack timing"]
    STK003 --> SYS003
    SYS003 --> SUB001
    SYS003 --> SUB003
    SYS003 --> SUB004
    SYS003 --> SUB005
    SYS003 --> IFC001
    SYS003 --> IFC003
    SYS003 --> SUB022
    SUB001 -->|verifies| VER001
    SUB003 -->|verifies| VER001
    SUB004 -->|verifies| VER002
    SUB005 -->|verifies| VER003
    IFC001 -->|verifies| VER004
    IFC003 -->|verifies| VER005
    SUB001 -->|e2e| VER009
    SUB022 -->|verifies| VER040

Verdict

PASS — Baseline BL-SEPHARMAMANUFACTURING-010 (VALIDATED-2026-03-25) created. All 7 safety hazards (H-001 through H-007) now have at least one VER requirement in their trace chain with Test methodology. The two highest-risk subsystems — {{entity:Process Analytical Technology Subsystem}} (SIL-3, H-004) and {{entity:Manufacturing Execution System}} (SIL-2, H-006/H-007) — have complete STK→SYS→SUB→VER chains. Session 560 raised VER trace coverage from 31% (36/115) to 38% (43/115) and closed all identified safety-critical gaps. Eight non-SIL SUB requirements remain without VER coverage and are deferred to session 561.