2019 Q27 — CA330 Operability and Isolation Setpoint

✓ C. Correct. For Part 1 and IAW LCO (3.6.3), the CA330s (Control Air Isolation Valves) are required to be OPERABLE in MODES 1-4 ONLY. For Part 2, The CA330s will automatically close on a Phase A Containment Isolation. A Phase A Containment Isolation signal is generated when Containment Pressure FIRST exceeds 4 psig.

✗ A. Incorrect but plausible. For Part 1, there are other LCOs that are applicable in ALL MODES. Consequently, the candidate could incorrectly conclude that LCO 3.6.3 is applicable in ALL MODES. Part 2 is correct.

✗ B. Incorrect but plausible. For Part 1, there are other LCOs that are applicable in ALL MODES. Consequently, the candidate could incorrectly conclude that LCO 3.6.3 is applicable in ALL MODES. For Part 2, 15 psig is the setpoint for a Phase B Containment Isolation Signal. The candidate could incorrectly conclude that the CA330s close on a Phase B Containment Isolation Signal.

✗ D. Incorrect but plausible. Part 1 is correct. For Part 2, 15 psig is the setpoint for a Phase B Containment Isolation Signal. The candidate could incorrectly conclude that the CA330s close on a Phase B Containment Isolation Signal.

Ref: LCO 3.6.3, NOS05CONAIR-12 (CONTROL AIR SYSTEM) | LO: Given a situation dealing with Control Air System operability, examine the situation and apply the appropriate Technical Specification action | Source: New | Cognitive: Lower