System

Pharmaceutical Manufacturing Line (se-pharma-manufacturing), continuing session. Previous session (548) completed decomposition of the {{entity:Process Analytical Technology Subsystem}} ({{sub:SUB-REQ-001}} through {{sub:SUB-REQ-007}}) and {{entity:Manufacturing Execution System}} ({{sub:SUB-REQ-008}} through {{sub:SUB-REQ-015}}) with full PAT-MES interface requirements. This session initialised the spec tree for all eight subsystems and completed the {{entity:Granulation and Blending}} subsystem decomposition. Project state at session start: 59 requirements, 4 diagrams. At close: 75 requirements, 55 trace links, 5 diagrams.

Decomposition

The Granulation and Blending subsystem was decomposed into five physical components arranged as a linear process train: {{entity:High Shear Granulator}} ({{hex:D7F53218}}), {{entity:Granule Transfer System}} ({{hex:56851218}}), {{entity:Fluid Bed Dryer}} ({{hex:D6F53218}}), {{entity:Granule Sizing Mill}} ({{hex:D6C53218}}), and {{entity:IBC Blender}} ({{hex:D6F53218}}). Two external interfaces were identified: the MES Recipe Controller and the PAT DAC Workstation.

The linear single-train topology was selected over parallel granulation because the campaign-based single-product production model requires only one granulator batch per tablet press charge. The key architectural decisions: the HSG provides process intensification (binder addition and wet massing in one vessel); the Sizing Mill is retained as a separate CPP-controlled step rather than an in-line FBD screen, decoupling drying and sizing validation; IBC blending avoids containment breach at transfer for OEB3+ APIs, with the NIR blend-endpoint probe validated in the specific IBC geometry per ICH Q2(R1).

flowchart TB
  n0["component - High Shear Granulator"]
  n1["component - Granule Transfer System"]
  n2["component - Fluid Bed Dryer"]
  n3["component - Granule Sizing Mill"]
  n4["component - IBC Blender"]
  n5["external - MES Recipe Controller"]
  n6["external - PAT DAC Workstation"]
  n0 -->|wet granules| n1
  n1 -->|wet granules| n2
  n2 -->|dried granules| n3
  n3 -->|sized granules| n4
  n5 -.->|recipe control| n0
  n5 -.->|recipe control| n2
  n5 -.->|blend recipe| n4
  n6 -.->|NIR blend endpoint| n4
  n2 -->|LOD NIR signal| n6

Analysis

UHT classification distinguished the {{entity:Granule Sizing Mill}} ({{hex:D6C53218}}) from the {{entity:Fluid Bed Dryer}} ({{hex:D6F53218}}) — the mill lacks the {{trait:Physical Medium}} trait present in the FBD, reflecting that the mill operates on solid-phase material without a fluid medium phase, while the FBD uses air as a processing medium. The {{entity:High Shear Granulator}} ({{hex:D7F53218}}) differs from both through an additional {{trait:Active}} trait, consistent with its continuously actuated impeller and chopper blades generating mechanical work on the product.

Lint identified 29 high-severity findings, of which 14 are acknowledged: eight “Powered-no-power-requirements” findings for process equipment (power specifications are in vendor IQ/OQ documentation, not functional SE requirements), and the ICH Q2(R1) reference string misclassified as a functional entity. The PAT subsystem “Functionally Autonomous without safety constraints” finding is a false positive — SUB-REQ-005 and SUB-REQ-006 explicitly constrain the autonomous sensor-degradation response. Remaining medium findings relate to the 25 homeless REQ-SEPHARMAMANUFACTURING-* requirements (not yet reassigned to STK/SYS documents) — this is a document housekeeping gap to be resolved in a QC session.

Requirements

Eight subsystem requirements ({{sub:SUB-REQ-016}} through {{sub:SUB-REQ-023}}) were created covering: HSG granulation endpoint detection with dual NIR/torque criterion, FBD LOD drying endpoint (target ±0.5% w/w), FBD CPP temperature control (±2°C setpoint, alarm at ±5°C for 60s), Sizing Mill PSD acceptance (D90 < 800 µm, D50 200–600 µm), IBC blend uniformity endpoint (RSD ≤5% by NIR), mass accountability (97–101% yield), degraded-mode blending when PAT NIR is unavailable (fixed-time with supervisory authorisation), and OEB3+ containment at transfer points (breathing zone ≤1 µg/m³). Three interface requirements were defined: {{ifc:IFC-REQ-006}} (G&B-to-PAT NIR spectral data, ≤30s interval, ≤5s latency), {{ifc:IFC-REQ-007}} (MES-to-G&B recipe delivery ≤2s, EBR feedback every 10s), and {{ifc:IFC-REQ-008}} (sealed IBC handoff to Tablet Compression with MES genealogy authorisation code). Four verification entries ({{ifc:IFC-REQ-006}} integration test, {{ifc:IFC-REQ-007}} integration test, IBC handoff inspection, and end-to-end G&B cycle test) were created and trace-linked to their source requirements.

Next

Spec tree status: PAT, MES, and Granulation and Blending complete (3 of 8 subsystems). Five subsystems remain: Material Handling and Dispensing (feeds G&B — IBC docking and dispensary interfaces need defining before G&B inputs are fully specified), Tablet Compression (consumes G&B output IBC), Film Coating, Packaging and Serialisation, and Containment and Environmental Control. Next session priority is {{entity:Tablet Compression}} — it consumes the IBC blended granules, and its in-process rejection requirement ({{sys:REQ-SEPHARMAMANUFACTURING-025}}, ±5% weight, hardness) involves safety-quality interlocks that need decomposing before the G&B-to-compression interface (IFC-REQ-008) can be fully verified. The 25 homeless STK/SYS requirements need reassignment during a QC pass.