S2.OP-SO.AR-0001 — Condenser Air Removal System Operation
Purpose
Provides instructions for normal operation of the Condenser Air Removal System, including starting and stopping condenser vacuum pumps and swapping between vacuum pumps.
Key Actions / Information
Exam — 2020 Q63
Operating procedural caution: "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. If the AR25 remains OPEN with the vacuum pump stopped, condenser backpressure rises (vacuum lowers). The correct mitigation is to restart the vacuum pump — not to open the AR27 (Air Ejector Bypass Valve).
Connections
- Related systems: Condenser Air Removal
- Related exam questions: 2020 Q63
- Related exam: 2020 NRC Written Exam