SALEM
SALEM STUDY SYSTEM
Exams > 2018 Q7 — CCW Radiation Monitor and Surge Tank Overflow

2018 Q7 — CCW Radiation Monitor and Surge Tank Overflow

⚠️ DRAFT
Q7 — CCW Radiation Monitor and Surge Tank Overflow 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 has also initiated 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 (Component Cooling Water) | LO: NOS05CCW000-11 — Describe how CC-149 Surge Tank Vent Valve impacts CCW during normal and abnormal conditions | Source: New | Cognitive: Lower

Connections