Q23 — Plant Vent Rad Monitor Response
APE 60 AK2.02 (2.7)
Given:
- Unit 2 is at 100% Power.
- A release of 21 Waste Gas Decay Tank is in progress in accordance with S2.OP-SO.WG-0008, Discharge of 21 Gas Decay Tank to Plant Vent.
- A Containment Pressure Relief is also in progress in accordance with S2.OP-SO.CBV-0002, Containment Pressure – Vacuum Relief System Operation, due to containment pressure at 0.2 psig.
- The RO reports that the 2R41D, Plant Vent, radiation monitor is in ALARM.
Which ONE of the following describes the plant response?
Note: 2WG41, GDT VENT CONT VLV
2VC5 and 2VC6, CONT PRESS RELIEF DAMPER
- Unit 2 is at 100% Power.
- A release of 21 Waste Gas Decay Tank is in progress in accordance with S2.OP-SO.WG-0008, Discharge of 21 Gas Decay Tank to Plant Vent.
- A Containment Pressure Relief is also in progress in accordance with S2.OP-SO.CBV-0002, Containment Pressure – Vacuum Relief System Operation, due to containment pressure at 0.2 psig.
- The RO reports that the 2R41D, Plant Vent, radiation monitor is in ALARM.
Which ONE of the following describes the plant response?
Note: 2WG41, GDT VENT CONT VLV
2VC5 and 2VC6, CONT PRESS RELIEF DAMPER
A. The 2WG41 and the 2VC5 and 2VC6 will automatically close terminating the decay tank release and the pressure relief.
B. The 2WG41 and the 2VC5 and 2VC6 require manual actions to close to terminate the pressure relief and the decay tank release.
C. The 2WG41 will automatically close terminating the decay tank release and the 2VC5 and 2VC6 require manual actions to close to terminate the pressure release.
D. The 2WG41 requires manual action to close to terminate the decay tank release and the 2VC5 and 2VC6 will automatically close to terminate the pressure release.
▶ Show Answer & Explanation
✓ A. Correct. When the 2R41D is in alarm, it will automatically close the 2WG41 (waste gas release valve), 2VC1 and 2VC4 dampers (containment purge), and the 2VC5 and 2VC6 dampers (containment pressure relief). It also aligns the 2R45 skid to the accident sampling loop.
✗ B. Incorrect. Plausible because the operator may incorrectly determine that no automatic actions will occur for these components.
✗ C. Incorrect. Plausible because the operator may incorrectly determine that the VC5 and VC6 dampers need to be manually closed.
✗ D. Incorrect. Plausible because the operator may incorrectly determine that the 2WG41 does not automatically close on high radiation signal.
Ref: S2.OP-AB.RAD-0001 | LO: NOS05ABRAD1-07, Objective 1 | Source: Bank - Salem | Cognitive: Fundamental/Memory
Connections
- Related systems: Waste Gas
- Related procedures: AB.RAD-0001 — Radiation Monitor Abnormality, S2.OP-SO.WG-0008 — 21 Gas Decay Tank to Plant Vent, S2.OP-SO.CBV-0002 — Containment Pressure Vacuum Relief System Operation
- Related exam: 2022 NRC Written Exam