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Exams > 2020 Q4 — RCP Motor Winding Temperature

2020 Q4 — RCP Motor Winding Temperature

⚠️ DRAFT
Q4 — RCP Motor Winding Temperature 000015AK3.01 (2.5)
Given:

Which ONE of the following would be an indication of the potential for damage to a Reactor Coolant Pump and require tripping the Reactor Coolant Pump in accordance with S2.OP-AB.RCP-0001, Reactor Coolant Pump Abnormality, Attachment 2, Stopping Reactor Coolant Pumps.
A. Closure of CC-131, RCP Thermal Barrier Valve for > 2 minutes.
B. Reactor Coolant Pump Motor Bearing Temperature of 170°F.
C. Reactor Coolant Pump Motor Flange Vibration of 3 mils.
D. Reactor Coolant Pump Motor Winding Temperature of 320°F.
▶ Show Answer & Explanation
✓ D. Correct. The Continuous Action Statement requiring stopping of RCPs is a Motor Winding temperature greater than 302°F.
✗ A. Incorrect. Plausible because the candidate may remember the Continuous Action Statement that says if RCP Seal Injection Flow and RCP Thermal Barrier Component Cooling Water Flows are lost concurrently, then RCPs should be secured within 2 minutes to prevent RCP damage. Incorrect as RCP Seal Injection Flow is unaffected.
✗ B. Incorrect. Plausible because the candidate may believe the Continuous Action Statement requires stopping RCPs if Motor Bearing Temperature is greater than 170°F. Incorrect in that the CAS temperature is greater than 175°F.
✗ C. Incorrect. Plausible because the candidate may remember that motor flange vibration of greater than 3 mils is an entry condition for AB.RCP-0001. Incorrect as the CAS requiring the stopping of RCPs is motor flange vibration greater than 5 mils.
Ref: S2.OP-AB.RCP-0001(Q), Reactor Coolant Pump Abnormality | LO: N/A | Source: Modified – Vision Database & Salem 2004 NRC Exam | Cognitive: Fundamental

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