Q78 — RCP Vibration Abnormal Procedure Actions
T1G1 APE 15 AA2.16 (3.5)
Given:
- Salem Unit 2 is operating at 30% power
- OHA D-36, RCP VIB HI, is LIT
- 21 RCP parameters are:
- Motor flange vibration is 3 mils and steady
- Shaft vibration is 16 mils and steady
- Engineering has determined the vibrations are valid
- The crew enters S2.OP-AB.RCP-0001, RCP Abnormality
What action will the CRS direct?
Note: TS 3.4.1.1, Reactor Coolant Loops and Coolant Circulation
2-EOP-TRIP-1, Reactor Trip or Safety Injection
- Salem Unit 2 is operating at 30% power
- OHA D-36, RCP VIB HI, is LIT
- 21 RCP parameters are:
- Motor flange vibration is 3 mils and steady
- Shaft vibration is 16 mils and steady
- Engineering has determined the vibrations are valid
- The crew enters S2.OP-AB.RCP-0001, RCP Abnormality
What action will the CRS direct?
Note: TS 3.4.1.1, Reactor Coolant Loops and Coolant Circulation
2-EOP-TRIP-1, Reactor Trip or Safety Injection
A. Trip the reactor and stop 21 RCP per Attachment 2, Stopping RCPs, of S2.OP-AB.RCP-0001.
B. Preparations for a controlled Unit shutdown to remove 21 RCP from service.
C. Stop 21 RCP within 1 hour per TS 3.4.1.1 and place the Unit in MODE 3 within 6 hours.
D. Trip the reactor and stop 21 RCP per OHA D-36 Alarm Response Procedure and enter 2-EOP-TRIP-1.
▶ Show Answer & Explanation
✓ B. Correct. The RCP vibration levels are below the requirements in Attachment 1 of AB.RCP-1 that require stopping the affected RCP per Attachment 2. The OHA ARP for D-36 directs entry into S2.OP-AB.RCP-0001. Per S2.OP-AB.RCP-0001 Step 3.10 allows the CRS/SM to determine if a Unit shutdown is required.
✗ A. Plausible because motor and flange vibrations are parameters on Attachment 1 of S2.OP-AB.RCP-0001 that may require stopping RCPs per Attachment 2. Incorrect in that the Attachment 1 RCP vibration levels have not been exceeded as of yet.
✗ C. Plausible if the applicant believes that since RCP trip criteria has not been reached per Attachment 1 of S2.OP-AB.RCP-0001, then take the action of TS 3.4.1.1 for a loss of an RCP. Incorrect in that the TS action is to place the unit in MODE 3 within one hour on a loss of RCS flow.
✗ D. Plausible if the applicant believes that the ARP will direct stopping and tripping the reactor which it does not, only directs entry into S2.OP-AB.RCP-0001.
Ref: S2.OP-AB.RCP-0001 (R28), TS 3.4.1.1 | LO: NOS05ABRCP0-08, Objective 4b | Source: New | Cognitive: Comprehension/Analysis
Connections
- Related system: RCPs
- Related procedure: AB.RCP-0001
- Related exam: 2023 NRC Written Exam