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Exams > 2023 JPM Sim-c — Depressurize RCS Using Aux Spray IAW EOP-LOCA-2

2023 JPM Sim-c — Depressurize RCS Using Aux Spray IAW EOP-LOCA-2

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JPM Sim-c — Depressurize RCS Using Aux Spray IAW EOP-LOCA-2 Sim | RO/SRO | A4.05 (3.2)
Location: Simulator
Time-Critical: No
Alternate Path: Yes
Estimated Time: 5 minutes

Initial Conditions:
- The reactor was tripped when a RCS leak occurred.
- All RCPs have been stopped
- 2PR1 is inoperable with 2PR6 isolated with power removed
- The operating crew has progressed through the EOPs and is now in 2-EOP-LOCA-2, POST LOCA COOLDOWN AND DEPRESSURIZATION

Initiating Cue:
- You are the Reactor Operator.
- The CRS directs you to depressurize the RCS to minimize subcooling IAW Step 20 of 2-EOP-LOCA-2, POST LOCA COOLDOWN AND DEPRESSURIZATION
- Notify the CRS when Step 20 is completed.
- Your evaluator will take care of all alarms not related to your task.
Task Standard:
The task is satisfactorily met when the applicant has depressurized RCS using Auxiliary spray IAW step 20 of 2-EOP-LOCA-2.
▶ Show Critical Steps & Key Actions
Step Critical Element Standard
C20-1 CAUTION: Accumulators should be isolated prior to depressurizing RCS to less than 700 psig if SI has been terminated Verifies 21-24SJ54s closed.
N20-1 NOTE: Upper head region may void during RCS depressurization if RCPs not running Acknowledges the Note.
20 Is normal PZR spray available? NO — with no RCPs running, normal spray is not available.
20 * (cont'd) Is at least one PZR PORV available? YES.
20 * (cont'd) Depressurize RCS using one PZR PORV Opens 2PR2 to attempt to depressurize RCS but it will not open. 2PR1 remains isolated and unavailable.
20 * (cont'd) Is RCS pressure dropping? NO — observes valve not repositioning. (Alternate path begins here.)
20 * (cont'd) Depressurize RCS using Aux Spray Opens 2CV75 (RCS Aux Spray Valve). Closes 2CV77 (Charging to Loop 23) and 2CV79 (Charging to Loop 24). Monitors RCS pressure and verifies pressure is lowering.
20 (cont'd) Operate PZR heaters as necessary to maintain PZR liquid saturated Checks PZR temperature and determines if pressurizer heaters are required to be energized.
20.1 * When PZR level >77% (74% adverse) or RCS subcooling <10F, stop RCS depressurization Realigns aux spray to normal: closes 2CV75 and opens 2CV77 or 2CV79. (RCS subcooling is cued as 9F and lowering.)
Key Decision Point:
The alternate path begins when 2PR2 (PORV) fails to open — the applicant must recognize that RCS pressure is NOT dropping, then transition to the Aux Spray depressurization method by opening 2CV75 and closing 2CV77/2CV79. The applicant must also recognize the subcooling limit of <10F (cued at 9F and lowering) requires stopping the depressurization and restoring normal charging alignment.
Ref: 2-EOP-LOCA-2 (R41) | Task: N1150090501 | System: 010 PZR Pressure Control System | K/A: A4.05 — Ability to manually operate and/or monitor in the control room: PZR Auxiliary Spray Valves | Source: New | View JPM PDF

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