2018 Q25 — Control Air CA330 / PORV Accumulators

✓ A. Correct. For Part 1, the CA330s fail closed on a loss of control air. For Part 2, each PORV has 2 accumulators and the accumulators are sized for 100 opening/closing cycles (50/accumulator). Consequently, with BOTH 11CA330 and 12CA330 CLOSED, each PZR PORV can be operated if needed.

✗ B. Incorrect but plausible. Part 1 is correct. For Part 2, the candidate could fail to recall that each PORV have accumulators. Consequently, with BOTH 11CA330 and 12CA330 CLOSED, the candidate would then incorrectly conclude that the PORVs can not be operated if needed.

✗ C. Incorrect but plausible. For Part 1, since the CA330s are Containment Isolation Valves, the candidate could incorrectly conclude that the CA330s fail closed on a loss of 125 VDC or 28 VDC Power. Part 2 is correct.

✗ D. Incorrect but plausible. For Part 1, since the CA330s are Containment Isolation Valves, the candidate could incorrectly conclude that the CA330s fail closed on a loss of 125 VDC or 28 VDC Power. For Part 2, the candidate could fail to recall that each PORV have accumulators. Consequently, with BOTH 11CA330 and 12CA330 CLOSED, the candidate would then incorrectly conclude that the PORVs can not be operated if needed.

Ref: NOS05CONAIR-12 (CONTROL AIR SYSTEM) | LO: 1 — Describe how each impact the Control Air System during normal and abnormal conditions: CA Containment Isolation Valves | Source: New | Cognitive: Higher