Q55 — Phase A Containment Isolation Valves
103000A3.01 (3.9)
Given:
• Unit 1 Operators are responding to a Reactor Trip and Safety Injection.
• The crew is verifying valves in their Safeguards positions in accordance with 1-EOP-TRIP-1, Reactor Trip or Safety Injection.
Which of the following valves receive a Phase A Isolation signal to close?
• Unit 1 Operators are responding to a Reactor Trip and Safety Injection.
• The crew is verifying valves in their Safeguards positions in accordance with 1-EOP-TRIP-1, Reactor Trip or Safety Injection.
Which of the following valves receive a Phase A Isolation signal to close?
A. 1CV2, 1CV277 (Letdown)
B. 1CC131, 1CC190 (RCP Thermal Barrier)
C. 11-14BF13 (Feedwater)
D. 1CC113, 1CC215 (Excess Letdown)
▶ Show Answer & Explanation
✓ D. Correct. The Excess Letdown Component Cooling Valves (CC113, 215) receive a Phase A signal to close.
✗ A. Plausible because the candidate may believe that the "letdown isolation" valves (CV2, 277) receive a Phase A signal. Incorrect as CV2, 277 only close on low PZR level signal, they are not containment isolation valves. CV3, 4, 5 & 7 are Phase A isolation valves for letdown.
✗ B. Plausible because the candidate may believe the RCP Thermal Barrier and Charging Isolation Valves receive a Phase A signal. Incorrect as the RCP Thermal Barrier is isolated on a Phase B signal.
✗ C. Plausible because the candidate may believe that the "Feedwater Isolation" valves (BF13s) receive a Phase A signal. Incorrect as the BF13s receive a Feedwater Isolation Signal, not Phase A.
Ref: 1-EOP-TRIP-1, Reactor Trip or Safety Injection. | LO: N/A | Source: New | Cognitive: Fundamental
Connections
- Related systems: Containment, CVCS, CCW, Feed & Condensate
- Related EOPs: EOP-TRIP-1 — Reactor Trip or Safety Injection
- Related exam: 2020 NRC Written Exam