SALEM
SALEM STUDY SYSTEM
Exams > 2020 Q63 — Condenser Air Removal AR25 Stuck Open

2020 Q63 — Condenser Air Removal AR25 Stuck Open

⚠️ DRAFT
Q63 — Condenser Air Removal AR25 Stuck Open 055000K3.01 (2.5)
Given:
  • Unit 2 is at 100% Power.
  • The Plant Operator (PO) is swapping Condenser Vacuum Pumps in accordance with S2.OP-SO.AR-0001, Condenser Air Removal System Operation.
  • The PO has started 24 Vacuum Pump successfully and has just initiated a stop on 22 Vacuum Pump.
  • The 22AR25, Air Ejector Suction Isolation Valve, remains OPEN.

Which ONE of the following describes the status of main condenser vacuum and what procedural action the crew will take to mitigate the event?
A. Condenser backpressure is rising. The PO restarts 22 Vacuum Pump.
B. Condenser backpressure is lowering. The PO restarts 22 Vacuum Pump.
C. Condenser backpressure is rising. The Secondary Field Operator ensures the 22AR27, Air Ejector Bypass Valve, is opened.
D. Condenser backpressure is lowering. The Secondary Field Operator ensures the 22AR27, Air Ejector Bypass Valve, is opened.
▶ Show Answer & Explanation
✓ A. Correct. The operating procedural caution states the following; "Failure of applicable AIR INJECTOR SUCTION ISOLATION VALVE (AR25) to close when a Condenser Vacuum Pump is stopped will result in loss of condenser vacuum. Contingency plans to attempt Vacuum Pump restart OR IMMEDIATE manual closure of the applicable AR23/AR25 valve should be considered whenever it is desired to maintain condenser vacuum when a Condenser Vacuum Pump is stopped.
✗ B. The first part is plausible as the candidate may confuse vacuum with backpressure, as vacuum will be lowering. The second part is correct.
✗ C. The first part is correct. The second part is plausible because the candidate remembers that field operation is necessary and may believe that if the air ejector is bypassed with the vacuum pump stopped that any condenser vacuum loss will stop.
✗ D. The first part is plausible as the candidate may confuse vacuum with backpressure, as vacuum will be lowering. The second part is plausible because the candidate remembers that field operation is necessary and may believe that if the air ejector is bypassed with the vacuum pump stopped that any condenser vacuum loss will stop.
Ref: NOS05CAR000-07, Condenser Air Removal and Priming System; S2.OP-SO.AR-0001(Z), Condenser Air Removal System Operation | LO: ELO 11 | Source: New | Cognitive: Comprehension

Connections