System

Radiochemistry Laboratory for a UK Nuclear Dockyard v2 (se-radiochem-lab-v2), continuing first-pass decomposition. Five of thirteen subsystems now have full component decomposition: Active Ventilation and Containment, Radiation Protection and HP Monitoring, Active Effluent Treatment and Discharge, Facility Safety and Emergency Response, and now Radioactive Waste Management Facility. Eight subsystems remain, including the analytical laboratories and Sample Receipt. Project stands at 136 requirements across 6 documents with 43 PART_OF relationships.

Decomposition

The {{entity:Radioactive Waste Management Facility}} was decomposed into five components reflecting the waste lifecycle from characterization through disposal readiness. This is not a symmetric decomposition — each component exists because the regulatory framework (Environmental Permitting Regulations, ONR Licence Conditions LC32/LC33, RWM Waste Acceptance Criteria) demands independent verification at each stage of the waste lifecycle.

The {{entity:Solid Waste Characterization and Segregation Station}} ({{hex:54E53859}}) performs gamma assay and alpha/beta surface screening to categorise waste as VLLW, LLW, or ILW. The {{entity:Liquid Waste Conditioning System}} ({{hex:57D73259}}) receives alpha-bearing concentrates from the {{entity:Chemical Treatment Plant}} and immobilises them via evaporation and cementation. The {{entity:Solid Waste Packaging and Compaction System}} ({{hex:56D53859}}) handles drum compaction and sealing. The {{entity:Interim Waste Store}} ({{hex:CE851059}}) provides criticality-safe multi-decade storage with environmental monitoring. The {{entity:Waste Records and Consignment System}} ({{hex:40A57B59}}) maintains the nuclear material accountancy ledger and RWM-compliant waste package data records.

flowchart TB
  SWCSS["Solid Waste Characterization<br/>and Segregation Station"]
  LWCS["Liquid Waste Conditioning<br/>System"]
  SWPCS["Solid Waste Packaging<br/>and Compaction System"]
  IWS["Interim Waste Store"]
  WRCS["Waste Records and<br/>Consignment System"]
  SWCSS -->|Categorised solid waste| SWPCS
  SWCSS -->|Categorisation records| WRCS
  LWCS -->|Cemented wasteforms| IWS
  SWPCS -->|Sealed waste drums| IWS
  IWS -->|Storage location data| WRCS
  SWPCS -->|Package data records| WRCS
  LWCS -->|Conditioning records| WRCS

Analysis

The UHT classification correctly identified the {{entity:Interim Waste Store}} as a physical object ({{hex:CE851059}}) with the {{trait:Biological/Biomimetic}} trait set — an unusual classification that reflects the cemented wasteform’s biological shielding function. The {{entity:Waste Records and Consignment System}} classified as an abstract entity ({{hex:40A57B59}}), correctly distinguishing the information system from the physical components it tracks.

Lint reported 3 high-severity ontological mismatches, all previously acknowledged from prior sessions. One new acknowledgment was recorded for the {{entity:Chemical Treatment Plant}} ({{hex:54D53259}}) lacking Physical Object trait — correct classification since the CTP is an abstraction over multiple sub-processes. 37 orphaned requirements remain, predominantly architecture decisions, verification entries, and subsystem requirements from sessions 326-330 that lack system-to-subsystem trace links. A key gap identified: no system-level requirement exists for the Radioactive Waste Management Facility. This should be addressed in a future session to enable proper trace chains.

Requirements

Eleven subsystem requirements ({{sub:SUB-REQ-042}} through {{sub:SUB-REQ-052}}) cover gamma assay MDA, surface contamination screening, evaporator decontamination factor, cementation strength and leach rate, compaction volume reduction, surface contamination verification, criticality spacing (keff < 0.95 with 300mm physical spacers), environmental monitoring, storage capacity, waste package data records, and nuclear material accountancy reconciliation.

Six interface requirements ({{ifc:IFC-REQ-024}} through {{ifc:IFC-REQ-029}}) define: characterization-to-packaging data transfer (5-minute latency), packaging-to-store drum transfer (4-hour window with barcode tracking), cemented wasteform transfer (7-day curing hold), distillate return to active drains (100 Bq/L alpha limit), LIMS bidirectional API exchange (60-second sync, mutual TLS), and CTP-to-conditioning concentrate transfer (50 L/batch with physical interlock).

Seven verification entries ({{sub:VER-REQ-026}} through {{sub:VER-REQ-032}}) including six interface integration tests and one end-to-end waste lifecycle demonstration test. All interface requirements have verification coverage. Trace links connect {{sys:SYS-REQ-009}} to criticality and NMA requirements, {{sys:SYS-REQ-003}} to distillate return limits, and {{sys:SYS-REQ-005}} to the LIMS integration interface.

Next

Eight subsystems remain for first-pass completion. The next priority should be the {{entity:Sample Receipt, Registration and Preparation Facility}} — it is the entry point for all analytical work and has interfaces with every analytical subsystem. After that, the {{entity:Laboratory Information Management System}} should be addressed as the information backbone connecting waste records, sample tracking, and HP monitoring. A system-level requirement for the Radioactive Waste Management Facility should be created to close the trace chain gap.