JPM Sim-e — Loss of SGFP Immediate Actions
Sim | RO/SRO | 059 A4.14 (3.1/3.3)
Location: Simulator
Time-Critical: No
Alternate Path: Yes
Estimated Time: 5 minutes
Initial Conditions:
- Unit 2 power ascension is in progress to 90% at 10% per hour.
- S2.OP-SO.TRB-0001 Attachment 5 is in progress up to step 4.
Initiating Cue:
- You are the Reactor Operator. Respond to all indications and alarms.
Time-Critical: No
Alternate Path: Yes
Estimated Time: 5 minutes
Initial Conditions:
- Unit 2 power ascension is in progress to 90% at 10% per hour.
- S2.OP-SO.TRB-0001 Attachment 5 is in progress up to step 4.
Initiating Cue:
- You are the Reactor Operator. Respond to all indications and alarms.
Task Standard:
Initiates a manual Main Turbine load reduction at 15%/min to 66% and inserts control rods in MANUAL due to failure of the rods to insert in AUTO.
Initiates a manual Main Turbine load reduction at 15%/min to 66% and inserts control rods in MANUAL due to failure of the rods to insert in AUTO.
▶ Show Critical Steps & Key Actions
| Step | Critical Element | Standard |
|---|---|---|
| 2.3 | Recognize loss of SGFP with Turbine Power >70% | Acknowledges alarms and indications of SGFP trip. Performs immediate actions of S2.OP-AB.CN-0001. |
| 2.3.1.A | Verify Automatic Turbine Runback has or is occurring | Identifies that an AUTO Main Turbine runback has NOT occurred (SGFP RUNBACK OPERATE light NOT lit, generator load NOT trending to ~775 MW). |
| 2.3.1.B * | Initiate manual Main Turbine load reduction to <66% at 15%/min | Identifies ramp rates are NOT preset for SGFP runback (as-found: 90% at 10%/hr). Depresses MIN/HR toggle to select %/MIN. Adjusts ramp rate to 15. Adjusts SETTER to 66. Selects GO. |
| 2.3.2 * | Control Tavg — recognize rods fail to insert in AUTO, place in MANUAL, insert rods | Ensures Rod Bank Selector Switch in AUTO. As RCS heats up during downpower, identifies rods not inserting when demanded (Terr). Places Rod Bank Selector Switch to MANUAL and inserts rods. |
Key Decision Point:
This JPM has two discriminating elements. First (Step 2.3.1.B): the automatic turbine runback fails, so the applicant must recognize the runback has not initiated and manually set up the DEHC panel for a 15%/min load reduction to 66% — this requires toggling from %/hr to %/min units. Second (Step 2.3.2): during the load reduction, Tavg rises above Tref because rods fail to insert in AUTO. The applicant must recognize the Terr divergence, take rods to MANUAL, and manually insert rods at 48 steps/min to restore Tavg to Tref.
This JPM has two discriminating elements. First (Step 2.3.1.B): the automatic turbine runback fails, so the applicant must recognize the runback has not initiated and manually set up the DEHC panel for a 15%/min load reduction to 66% — this requires toggling from %/hr to %/min units. Second (Step 2.3.2): during the load reduction, Tavg rises above Tref because rods fail to insert in AUTO. The applicant must recognize the Terr divergence, take rods to MANUAL, and manually insert rods at 48 steps/min to restore Tavg to Tref.
Ref: S2.OP-AB.CN-0001 (Rev 31), S2.OP-SO.TRB-0001 | Task: N1140100401 | K/A: 059 A4.14 — Ability to manually operate and/or monitor in the control room: Main Feedwater (3.1/3.3) | Safety Fn: 4-Sec | Source: Modified | View JPM PDF
Connections
- Related procedures: AB.CN-0001 — Condensate System Abnormality
- Related systems: Feed & Condensate, Control Rod Drive
- Related exam: 2022 NRC Operating Exam