Q86 — RCP Seal Failure AB.RCP Actions
003 A2.02 (3.9) SRO
Given:
• Unit 2 is at 100% Power.
• The RO reports the following for 21 RCP:
- Console Alarm, SEAL LEAK-OFF FLOW HI-LO, is LIT.
- Seal Leak-off recorder indicates > 6 gpm.
- Seal Injection Flow indicates 8.5 gpm.
- Seal Inlet and Outlet Temperatures are indicating 109°F and rising.
• The crew enters S2.OP-AB.RCP-0001, Reactor Coolant Pump Abnormality.
Which ONE of the following completes both statements?
1. Which RCP seal failed?
2. In accordance with S2.OP-AB.RCP-0001, what actions will the CRS direct the crew?
• Unit 2 is at 100% Power.
• The RO reports the following for 21 RCP:
- Console Alarm, SEAL LEAK-OFF FLOW HI-LO, is LIT.
- Seal Leak-off recorder indicates > 6 gpm.
- Seal Injection Flow indicates 8.5 gpm.
- Seal Inlet and Outlet Temperatures are indicating 109°F and rising.
• The crew enters S2.OP-AB.RCP-0001, Reactor Coolant Pump Abnormality.
Which ONE of the following completes both statements?
1. Which RCP seal failed?
2. In accordance with S2.OP-AB.RCP-0001, what actions will the CRS direct the crew?
A. 1) #1
2) Immediately TRIP the reactor and stop 21 RCP.
2) Immediately TRIP the reactor and stop 21 RCP.
B. 1) #1
2) Perform an orderly shutdown and stop 21 RCP within 8 hours.
2) Perform an orderly shutdown and stop 21 RCP within 8 hours.
C. 1) #2
2) Immediately TRIP the reactor and stop 21 RCP.
2) Immediately TRIP the reactor and stop 21 RCP.
D. 1) #2
2) Perform an orderly shutdown and stop 21 RCP within 8 hours.
2) Perform an orderly shutdown and stop 21 RCP within 8 hours.
▶ Show Answer & Explanation
✓ A. Correct. IAW S2.OP-AB.RCP-0001 Attachment 1, #1 seal leak-off flow greater or equal to 6 gpm then go to Attachment 2, Stopping RCPs. Attachment 2 will direct a manual reactor trip, stopping 21 RCP, then between 3-5 minutes after stopping RCP close the 21CV104 and go to 2-EOP-TRIP-1.
✗ B. Incorrect. First part is correct. Second part is incorrect. This action will be performed at step 3.6 if RCP seal leak-off flow is less than 0.8 gpm or is slowly approaching 6 gpm. Credible distractor since this is an action in AB.RCP-1 for a degraded #2 seal.
✗ C. Incorrect. First part is incorrect. High seal leak-off flow is indicative of a #1 seal failure. Second part is correct. Plausible because this is an action if it meets the RCP trip criteria per the AB.RCP.
✗ D. Incorrect. First part is incorrect. High seal leak-off flow is indicative of a #1 seal failure. Second part is incorrect. This action will be performed at step 3.6 if RCP seal leak-off flow is less than 0.8 gpm or is slowly approaching 6 gpm. Credible distractor since this is an action in AB.RCP-1 for a degraded #2 seal.
Ref: S2.OP-AB.RCP-0001 (R28) | LO: NOS05SGTR01-06, Objective 6 | Source: New | Cognitive: Comprehension/Analysis
Connections
- Related systems: RCPs, CVCS
- Related procedures: AB.RCP-0001 — RCP Abnormality
- Related EOPs: EOP-TRIP-1 — Reactor Trip or Safety Injection
- Related exam: 2022 NRC Written Exam