2022 Q22 — Fuel Handling Incident Alarms

✓ D. Correct. During a fuel handling incident in the spent fuel pool, the 2R5 or 2R9 area radiation monitors would detect the release of radioactivity from the pool. When either the 2R5 or 2R9 reaches the alarm setpoint, the FHB ventilation will start both exhaust fans and shift the filter alignment to HEPA Plus Charcoal filters as indicated on the control console.

✗ A. Incorrect. Credible distractor if the operator believes the fuel handling incident is inside containment which would cause the 2R2 or 2R10A/B to be in warning or alarm. In addition, the operator may also believe that 2R2 or 2R10A/B radiation monitors would also actuate the Control Room Ventilation to Accident Pressurize Mode because this would be a response to a release to the outside environment. The FHB low pressure alarm is plausible because the applicant may believe that during actuation of the fans through the charcoal filters this may be an expected condition due to more restricted air flow.

✗ B. Incorrect. Plausible distractor because the operator may believe that the CAV system will operate in AP Mode to protect the control room operators from the radiation release.

✗ C. Incorrect. Plausible distractor because the containment radiation area monitors could be in Alarm if the fuel incident was inside containment. The FHB low pressure alarm is plausible because the applicant may believe that during actuation of the fans through the charcoal filters this may be an expected condition due to more restricted air flow.

Ref: S2.OP-AB.FUEL-0001 | LO: NOS05ABFUEL1-08, Objective 4 | Source: New | Cognitive: Comprehension/Analysis