Q54 — CCW Leak Location / Chlorides
APE: 026 Loss of CCW-AA2.01 (3.1)
Given:
• Unit 1 is at 100% Reactor Power and stable
• 12 CC Heat Exchanger is in service
• 12 Charging Pump is in service
• CCW Surge Tank level is 61% and rising
• The crew is performing S1.OP-AB.CC-0001 (Component Cooling Abnormality)
• Chemistry has sampled CCW and reports the following parameters have changed based on the previous CCW sample before S1.OP-AB.CC-0001 was entered:
◦ Chromate concentration has lowered
◦ Chloride concentration has risen
In accordance with S1.OP-AB.CC-0001, which ONE of the following completes the statement below?
The leak is located in the ___
• Unit 1 is at 100% Reactor Power and stable
• 12 CC Heat Exchanger is in service
• 12 Charging Pump is in service
• CCW Surge Tank level is 61% and rising
• The crew is performing S1.OP-AB.CC-0001 (Component Cooling Abnormality)
• Chemistry has sampled CCW and reports the following parameters have changed based on the previous CCW sample before S1.OP-AB.CC-0001 was entered:
◦ Chromate concentration has lowered
◦ Chloride concentration has risen
In accordance with S1.OP-AB.CC-0001, which ONE of the following completes the statement below?
The leak is located in the ___
A. Seal Water Heat Exchanger
B. Letdown Heat Exchanger
C. 12 CC Heat Exchanger
D. 12 Charging Pump
▶ Show Answer & Explanation
✓ C. Correct. IAW S1.OP-AB.CC-0001, "Any inleakage will dilute CC System Chromates and SW inleakage will increase Chloride concentration." Consequently, since Chemistry has reported that Chloride concentration has risen, there is SW inleakage into CCW. 12 CC Heat Exchanger is the source of the CCW leakage.
✗ A. Incorrect but plausible. Since ALL three distractors will cause CCW Surge Tank level to rise and chromate concentration to lower, the candidate could incorrectly conclude any of the distractors are the source of the CCW leak.
✗ B. Incorrect but plausible. Since ALL three distractors will cause CCW Surge Tank level to rise and chromate concentration to lower, the candidate could incorrectly conclude any of the distractors are the source of the CCW leak.
✗ D. Incorrect but plausible. Since ALL three distractors will cause CCW Surge Tank level to rise and chromate concentration to lower, the candidate could incorrectly conclude any of the distractors are the source of the CCW leak.
Ref: S1.OP-AB.CC-0001 (Component Cooling Abnormality) | LO: NOS05ABCC01-09 | Source: Modified Bank | Cognitive: Higher
Connections
- Related systems: CCW, Service Water
- Related procedures: AB.CC-0001 — Loss of Component Cooling Water
- Related exam: 2018 NRC Written Exam