2018 Q9 — PZR Spray and PORV Setpoints

✓ C. Correct. For Part 1, with PZR Pressure at 2312, the PZR Spray Valves are fully open. For Part 2, with PZR Pressure at 2340, the PZR PORVs are open.

✗ A. Incorrect but plausible. For Part 1, 2315 psig is the PZR Pressure setpoint at which the PORVs would fully close. Consequently, the candidate could mistake the 2315 psig setpoint for when the PZR Spray valves go fully open. Consequently, the candidate would incorrectly conclude that at 12:00:00, the PZR Spray valves are throttled (and not fully open). Part 2 is correct.

✗ B. Incorrect but plausible. For Part 1, same reasoning as A. For Part 2, the PZR master controller setpoint is at 100% when PZR pressure is 2355 psig. The candidate could incorrectly conclude that the PZR PORVs open when the PZR master controller is at 100% (or 2355 psig). This would then cause the candidate to incorrectly conclude that at 12:00:30, the PZR PORVs are closed.

✗ D. Incorrect but plausible. Part 1 is correct. For Part 2, the PZR master controller setpoint is at 100% when PZR pressure is 2355 psig. The candidate could incorrectly conclude that the PZR PORVs open when the PZR master controller is at 100% (or 2355 psig). This would then cause the candidate to incorrectly conclude that at 12:00:30, the PZR PORVs are closed.

Ref: NOS05PZRP&L-10 (Pressurizer Pressure and Level Control) | LO: NOS05PZRP&L-10 — Describe how Spray Valves, PORVs, and MPC impact PZR P&L during normal and abnormal conditions | Source: New | Cognitive: Higher