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Exams > 2023 Q42 — SG High Level Trip and FW Isolation

2023 Q42 — SG High Level Trip and FW Isolation

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Q42 — SG High Level Trip and FW Isolation T2G1 059 G2.4.2 (4.5)
Given:
• Salem Unit 2 is at 100% power
• 21BF19, MFW Regulating Valve, fails fully OPEN

Which of the following completes the statement regarding how the plant will respond?

The reactor will trip and the crew will enter 2-EOP-TRIP-1, Reactor Trip or Safety Injection, when high level on SG NR levels reach (1) followed by a (2).
A. (1) 67% (2) Feedwater Isolation
B. (1) 67% (2) Feedwater Interlock ONLY
C. (1) 92% (2) Feedwater Isolation
D. (1) 92% (2) Feedwater Interlock ONLY
▶ Show Answer & Explanation
✓ A. Correct. Failed open BF19 will result in a Main Turbine Trip on high SG level followed by a reactor trip. The SG High Level setpoint is 2 out of 3 SG NR levels ≥ 67% on any one SG (P-14). P-14 will trip the main turbine that will cause an auto reactor trip and actuate a FW Isolation to close all BF13s, BF19s, BF40s, trip both SGFPs, and trips Main Turbine. FW interlock only closes the BF19s and BF40s.
✗ B. Incorrect. Plausible because a reactor trip will actuate a FW Interlock. Incorrect in that the SG high level (P-14) signal actuate a FW Isolation.
✗ C. Incorrect. Plausible because this is the reactor trip setpoint for PZR high level.
✗ D. Incorrect. Plausible because this is the reactor trip setpoint for PZR high level. Incorrect in that the P-14 setpoint is 67% and a FW Isolation occurs.
Ref: Drawing ESF-1 | Source: Bank — Salem | Cognitive: Fundamental/Memory
K/A: 059 G2.4.2 — Knowledge of system setpoints, interlocks, and automatic actions associated with emergency and abnormal operating procedure entry conditions

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