2018 Q46 — Control Room Ventilation Rad Monitor

✓ C. Correct. For Part 1, the Control Room Ventilation will shift to ACCIDENT PRESSURIZED MODE when 2R1B-2 goes into ALARM. This first occurs at 12:10. For Part 2, when 2R1B-2 (Rad monitor is located in Unit 1 Normal Intake Duct) goes into alarm, ONLY the Unit 2 EACS Intake dampers AUTOMATICALLY open.

✗ A. Incorrect but plausible. For Part 1, other Radiation Monitors (2R19s and 1R19s) have automatic functions when the monitor goes into WARNING. Consequently, the candidate could incorrectly conclude that Control Room Ventilation will shift to ACCIDENT PRESSURIZED MODE when 2R1B-2 goes into WARNING. Part 2 is correct.

✗ B. Incorrect but plausible. For Part 1, other Radiation Monitors (2R19s and 1R19s) have automatic functions when the monitor goes into WARNING. Consequently, the candidate could incorrectly conclude that Control Room Ventilation will shift to ACCIDENT PRESSURIZED MODE when 2R1B-2 goes into WARNING. For Part 2, since Unit 1 and Unit 2 control room share the same Control Room Envelope, the candidate could incorrectly conclude that Unit 1 and Unit 2 EACS Intake dampers will automatically open.

✗ D. Incorrect but plausible. Part 1 is correct. For Part 2, since Unit 1 and Unit 2 control room share the same Control Room Envelope, the candidate could incorrectly conclude that Unit 1 and Unit 2 EACS Intake dampers will automatically open.

Ref: NOS05CAVENT-11 (Control Area Ventilation System) | LO: NOS05CAVENT-11 LO 9 | Source: Modified Bank | Cognitive: Higher