Q90 — Containment Pressure Relief / R12A Failure ODCM
T2G1 073 A2.01 (3.1)
Given:
• Salem Unit 2 is at 100% power
• A Containment Pressure Relief is in progress
Then:
• 2R12A, Containment Atmosphere Radiation Monitor, fails due to a power supply failure
• The Containment Pressure Relief is stopped
Based on the above condition, which of the following is ONLY required per the ODCM to recommence the containment pressure relief (assume all other Radiation Monitors are OPERABLE)?
[REFERENCE PROVIDED]
Per the ODCM requirements, the Containment Pressure Relief ...
• Salem Unit 2 is at 100% power
• A Containment Pressure Relief is in progress
Then:
• 2R12A, Containment Atmosphere Radiation Monitor, fails due to a power supply failure
• The Containment Pressure Relief is stopped
Based on the above condition, which of the following is ONLY required per the ODCM to recommence the containment pressure relief (assume all other Radiation Monitors are OPERABLE)?
[REFERENCE PROVIDED]
Per the ODCM requirements, the Containment Pressure Relief ...
A. may recommence without any compensatory actions.
B. may recommence provided two independent samples of containment are analyzed and two release rate calculations are independently verified.
C. may recommence provided grab samples are taken at least once per 8 hours and analyzed for principal gaseous emitters.
D. may NOT recommence until 2R12A radiation monitor is restored to OPERABLE status.
▶ Show Answer & Explanation
✓ A. Correct. Per Table 3.3-13 (Item 3.a) in 3.3.9 of Salem's ODCM, either 2R12A OR 2R41A & D channels is required. Since 2R41 channels are operable (assumption in stem) then ODCM 3.3.9 is MET and no additional action is required to recommence the containment pressure relief.
✗ B. Plausible because this would be the required action (Action 37) if both 2R12A and 2R41A & D channels are INOPERABLE.
✗ C. Plausible because this would be the required action (Action 33) if the SRO incorrectly selects Item 4.a as the affected ODCM instrument. Incorrect in that this is for the Plant Vent Radiation Monitor (R41).
✗ D. Plausible because this is a required action (Action 34) for a containment purge. Incorrect in that this is for a containment pressure relief.
Ref: Salem ODCM 3.3.9 (R29) | LO: NOS05TECHSPEC-12, Obj 14 — Describe the general component and parameter categories that are addressed by Technical Specification Sections 3/4.1 through 3/4.12 | Source: Modified Bank - DC Cook 2018 NRC SRO90 | Cognitive: Comprehension/Analysis
Connections
- Related systems: Containment, Waste Gas
- Related exam: 2023 NRC Written Exam