Approval & action center

REV-015 pending

Proposals waiting for a named human decision. Nothing here takes effect until the required people sign, and implementation still happens in the source system.

Signing as Alex Rivera · MSAT LeadSignatures designed to support Part 11 workflows; demo signatures are not Part 11 recordsDemo · read-only

Triage ledger

Select an item to open its dossier

Type	Risk	Requester	Signers	Age
Recipe change	HIGH	Process Optimization agent · edited by Alex Rivera	MSAT_LEAD + QA_REVIEWER	3 h
Lab record	MEDIUM	M. Okafor · QC	QA_REVIEWER	5 h
Schedule change	MEDIUM	Marcus Bell · Supervisor	CLEANROOM_SUPERVISOR + QA_REVIEWER	1 d
CAPA proposal	MEDIUM	Alex Rivera · MSAT	QA_REVIEWER	2 d
Data request	LOW	Alex Rivera · MSAT	MSAT_LEAD	4 d

Review dossier

ACT-2026-0891

ACT-2026-0891ProposalRisk: HIGH

Recipe patch RCP-AB014-V4.patch.02 · closed-loop mass-balance feed cascade

Scope: Recipe RCP-AB014-V4 · Skid BR-UP-01 · PM-204 · from MES-26074 · Authored by Process Optimization agent (RUN-2026-1042), edited by Alex Rivera

Proposed changes · before / after

Parameter	Baseline	Proposed	Unit
Feed control mode	Open-loop	Closed-loop mass-balance cascade	—
Feed setpoint	16.90	16.90 (gravimetric trim ±0.8)	mL/min
Head-pressure interlock	1.50	1.25	bar
Tubing replacement interval	500	400	h
Dynamic slip verification after occlusion change	Not required	Required	—

Rationale

Hypothesis

Under the current open-loop feed, PM-204 delivered 14.2% less than setpoint after the T+264.4h pressure event and the control system did not compensate . The most-likely cause is tubing over-occlusion after WO-8819 . A gravimetric mass-balance cascade would correct delivered mass regardless of tubing slip, and a lower interlock would stop the pump before tubing damage escalates .

Expected result

Calculated

+5.1 yield-index pts (illustrative)

Simulated range +2.8 to +6.4 pts across 200 OPT-104 runs. Model not validated against plant outcomes; not a probability of success.

Constraints & owner

Requires load cell on feed tote (installed on BR-UP-01).
Applies from MES-26074 onward; not retroactive to MES-26073.
Implementation owner: Alex Rivera via DeltaV recipe change control.

Supporting evidence

What evidence would change this recommendation

Tubing teardown showing normal wear (would weaken the over-occlusion hypothesis behind the interlock change).
Gravimetric slip data from PM-204 at 184 RPM within ±3% (open-loop may then be adequate with CAPA-01 alone).
Loop-tuning trials showing the cascade oscillates at low feed rates.

Status is distinct from approval and execution

Signing approves the proposal for implementation planning only. Implementation happens in DeltaV under change control, and effectiveness is verified on later batches.

Required signatures

MSAT Lead
Alex Rivera
PENDING
QA Reviewer
Priya Natarajan
PENDING

Justification *

0/20 characters minimum

Approving records your decision only. It does not push the change to DeltaV or any control system. A separate, authorized change-control step in your existing systems is still required.

Action lifecycle

Proposal, approval, implementation and effectiveness are tracked separately

1Proposed
2Under reviewCurrent
3Approved
4Implemented in source system
5Effectiveness verified

Audit trail

Append-only in production; local in demo

2026-10-19 08:32 UTC
Process Optimization agent · RUN-2026-1042
Created ACT-2026-0891 from OPT-104 scenario S-3 (model opt-sim v0.9.2, 6 sources).
2026-10-19 13:36 UTC
Alex Rivera · MSAT Lead
Edited: head-pressure interlock 1.30 → 1.25 bar; added dynamic slip verification requirement.
2026-10-19 13:40 UTC
Alex Rivera · MSAT Lead
Submitted for review. Signatures requested: MSAT_LEAD, QA_REVIEWER.
2026-10-19 15:10 UTC
Priya Natarajan · QA Reviewer
Opened evidence package (6 sources viewed).
2026-10-19 16:30 UTC
System
Re-checked source hashes: 6 of 6 unchanged. Historian gap at T+182h still unresolved.