Q8 — CCW Radiation Monitor Response
008 CCWS-A2.04 (3.3)
Given:
- Unit 2 is in MODE 3
At time 15:00:00
- BOTH 2R17A/B (Component Cooling Process Monitors) have just come into HI alarm
At time 15:01:00
- The crew initiates S2.OP-AB.CC-0001 (Component Cooling Abnormality) and S2.OP-AB.RAD-0001 (Abnormal Radiation)
At time 15:15:00
- Chemistry has verified a rise in Component Cooling activity
Which ONE of the following completes the statements below?
At 15:00:30, 2CC149 (Surge Tank Vent Valve) is _(1)_.
If CCW Surge Tank overflows, then the in-service Waste Holdup Tank _(2)_ will become contaminated.
- Unit 2 is in MODE 3
At time 15:00:00
- BOTH 2R17A/B (Component Cooling Process Monitors) have just come into HI alarm
At time 15:01:00
- The crew initiates S2.OP-AB.CC-0001 (Component Cooling Abnormality) and S2.OP-AB.RAD-0001 (Abnormal Radiation)
At time 15:15:00
- Chemistry has verified a rise in Component Cooling activity
Which ONE of the following completes the statements below?
At 15:00:30, 2CC149 (Surge Tank Vent Valve) is _(1)_.
If CCW Surge Tank overflows, then the in-service Waste Holdup Tank _(2)_ will become contaminated.
A. (1) open (2) and the 22 ABV Exhaust Filter Unit
B. (1) open (2) ONLY
C. (1) closed (2) and the 22 ABV Exhaust Filter Unit
D. (1) closed (2) ONLY
▶ Show Answer & Explanation
✓ C. Correct. For Part 1, 2CC149 automatically closes on high radiation alarm on 2R17A/B. For Part 2, IAW S2.OP-AB.CC-0001 Step 3.8 NOTE, "Allowing CCW Surge Tank to overflow will contaminate the in-service Waste Holdup Tank and the 22 ABV Exhaust Filter Unit".
✗ A. Incorrect but plausible. For Part 1, 2CC149 is normally open and the candidate could not recall that 2CC149 closes when 2R17A/B being in alarm. Consequently at 15:00:30, the candidate could incorrectly conclude that 2CC149 is open. Part 2 is correct.
✗ B. Incorrect but plausible. For Part 1, 2CC149 is normally open and the candidate could not recall that 2CC149 closes when 2R17A/B being in alarm. Consequently at 15:00:30, the candidate could incorrectly conclude that 2CC149 is open. For Part 2, the candidate could fail to recognize the 22 ABV Exhaust Filter Unit will also become contaminated when the CCW Surge Tank overflows.
✗ D. Incorrect but plausible. Part 1 is correct. For Part 2, the candidate could fail to recognize the 22 ABV Exhaust Filter Unit will also become contaminated when the CCW Surge Tank overflows.
Ref: NOS05CCW000-11 | LO: NOS05CCW000-11 | Source: Bank (ILOT NRC 1601 RO Q7) | Cognitive: Lower
Connections
- Related systems: CCW, Radiation Monitoring
- Related procedures: AB.CC-0001 — Loss of Component Cooling Water, AB.RAD-0001 — Radiation Monitor Abnormality
- Related exam: 2019 NRC Written Exam