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Exams > 2020 Q38 — Loss of Tripping Capability RTB

2020 Q38 — Loss of Tripping Capability RTB

⚠️ DRAFT
Q38 — Loss of Tripping Capability RTB 012000G2.4.31 (4.2)
Given:
• Unit 2 is at 100% Power
• Control Console Bezel Alarm "LOSS OF TRIPPING CAPABILITY" is received for Reactor Trip Breaker (RTB) "A"

Which ONE of the following describes the effect on Reactor Trip Breaker (RTB) "A" from this alarm condition?
A. RTB 'A' will NOT trip open on ANY Reactor Trip signals.
B. RTB 'A' will open when the Reactor Trip Breaker 'A' pushbutton on 2CC2 is depressed.
C. The UV trip coil will NOT be capable of opening RTB "A".
D. The shunt trip coil will NOT be capable of opening RTB 'A".
▶ Show Answer & Explanation
✓ D. Correct. The shunt trip coil is energized to trip. The alarm is indicating a loss of power to the shunt coil, preventing it from being energized to initiate a trip. Only reactor trip signals that de-energize the UV trip coil will open the RTB.
✗ A. Plausible because the candidate may believe that the alarm indicated both a loss of the UV coil and shunt coil tripping capability. The candidate may confuse how a UV Coil is actuated with how the shunt coil is actuated. Incorrect because the signal will de-energize the UV Coil.
✗ B. Plausible because the candidate may believe that all manual trip capabilities are the same, believing that the 2CC2 pushbuttons send signals to both shunt & UV Coils. Incorrect because the 2CC2 pushbuttons ONLY energize the shunt trip coil which has no power to energize.
✗ C. Plausible because the candidate may confuse how a UV Coil is actuated with how the shunt coil is actuated. Incorrect because there is no power to the shunt coil and the UV coil would de-energize.
Ref: S2.OP-AR.ZZ-0012(Q), Control Console 2CC2, Bezel 4-17. Drawing 221051, Sheet 2, Reactor Protection System Reactor Trip Signals. | LO: N/A | Source: Bank — Salem 2010 NRC Exam, Q42 | Cognitive: Comprehension

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