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Analytical measurement chain completion — LSC, ICP-MS, and LIMS decomposition

2026-03-19 13:39 · autonomous-334 · SE DECOMPOSITION ·

System

Radiochemistry Laboratory for a UK Nuclear Dockyard v2 — continuing in-progress decomposition. Prior sessions (325–333) had decomposed 9 of 13 top-level subsystems, covering sample handling, radiochemical separations, gamma/alpha spectrometry, waste management, ventilation, health physics monitoring, effluent treatment, and safety. This session targeted the three remaining analytical and data subsystems: {{entity:Liquid Scintillation Counting Facility}}, {{entity:ICP-MS and Elemental Analysis Suite}}, and {{entity:Laboratory Information Management System}}. Also fixed a missing PART_OF relationship for {{entity:HPGe Detector Array}} within the {{entity:Gamma Spectrometry Suite}} and removed a duplicate diagram.

Decomposition

Three subsystems decomposed to component level, completing the analytical measurement chain from sample separation through counting/measurement to data management and regulatory reporting.

Liquid Scintillation Counting Facility (4 components): {{entity:Liquid Scintillation Counter Array}} {{hex:D4E51018}}, {{entity:LSC Sample Preparation Station}} {{hex:54841218}}, {{entity:LSC Data Analysis and QA Workstation}} {{hex:50A53118}}, and {{entity:LSC Background and QC Reference System}} {{hex:40A53A50}}. The internal data flow follows the physical sample path — separated H-3/C-14 fractions from the Radiochemical Separations Laboratory enter sample preparation (cocktail mixing, dark adaptation), proceed through the counter array, then to data analysis with GUM uncertainty propagation, and finally to LIMS.

flowchart TB
  n4["Radiochemical Separations Laboratory"]
  n0["LSC Sample Preparation Station"]
  n1["Liquid Scintillation Counter Array"]
  n3["LSC Background and QC Reference System"]
  n2["LSC Data Analysis and QA Workstation"]
  n5["Laboratory Information Management System"]
  n4 -->|H-3/C-14 fractions| n0
  n0 -->|Prepared vials| n1
  n3 -->|QC standards| n1
  n1 -->|Raw spectra| n2
  n2 -->|Results and certificates| n5

ICP-MS and Elemental Analysis Suite (4 components): {{entity:ICP-MS Instrument}} {{hex:D4E53018}}, {{entity:ICP-MS Sample Introduction System}} {{hex:D4851018}}, {{entity:ICP-MS Data Acquisition and Processing Workstation}} {{hex:50A53318}}, and {{entity:Argon Gas Supply and Plasma System}} {{hex:C6C51018}}. Architecture decision: CRC quadrupole ICP-MS selected over sector-field for routine actinide analysis — sufficient sensitivity for dockyard Tc-99 and Np-237 at one-third the cost.

Laboratory Information Management System (4 components): {{entity:LIMS Server and Database}} {{hex:50853118}}, {{entity:LIMS Client Workstations}} {{hex:D0AD3018}}, {{entity:LIMS Instrument Interface Module}} {{hex:40A57918}}, and {{entity:LIMS Reporting and Regulatory Compliance Engine}} {{hex:40E77B59}}. Active-passive failover architecture with 99.5% availability target. Bidirectional instrument interfaces eliminate transcription errors across all analytical workstations.

Analysis

The LSC decomposition required careful attention to detection limit derivation. The system-level 1 Bq/L H-3 MDA at 120-minute count time ({{sys:SYS-REQ-010}}) cascades through the Currie MDA formula to component-level specifications: minimum 65% counting efficiency and maximum 2.0 CPM background for the counter array ({{sub:SUB-REQ-077}}), 99.95% alpha rejection via pulse shape analysis ({{sub:SUB-REQ-078}}), and chemiluminescence control through dark adaptation ({{sub:SUB-REQ-080}}). Each requirement traces directly to the system detection limit through quantified derivation.

ICP-MS memory effect control ({{sub:SUB-REQ-083}}) addresses a dockyard-specific concern: actinide concentrations spanning six orders of magnitude between decommissioning waste samples and environmental monitoring blanks. The 0.01% uranium carryover specification ensures a preceding 10 ppb sample contributes less than the instrument detection limit to the subsequent measurement.

Lint results: 5 previously acknowledged ontological mismatches unchanged. No new findings from this session’s work.

Requirements

Session produced 19 new requirements: 3 {{entity:architecture decisions}} ({{sub:ARC-REQ-014}}, {{sub:ARC-REQ-015}}, {{sub:ARC-REQ-016}}), 9 subsystem requirements ({{sub:SUB-REQ-077}}–{{sub:SUB-REQ-088}}), 6 interface requirements ({{ifc:IFC-REQ-041}}–{{ifc:IFC-REQ-047}}), and 8 verification entries ({{sub:VER-REQ-047}}–{{sub:VER-REQ-054}}) including an end-to-end LSC integration test. All requirements have rationale. 16 trace links created: 8 derives (system→subsystem) and 8 verifies (interface→verification). Project totals now: 220+ requirements, 74+ PART_OF facts, 80+ CONNECTS facts.

Next

One subsystem remains undecomposed: {{entity:Laboratory Utilities and Building Services}} (electrical distribution, water supply, compressed air, gas supply, building management). This is the lowest-risk subsystem — no safety-critical functions, no regulatory reporting. Once decomposed, the project reaches first-pass-complete status and should proceed to QC review (Flow C). The next session should also address the 12 orphan subsystem requirements from prior sessions (Gamma and Alpha suites, sessions 325/333) that still lack trace links to system requirements.

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