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Exams > 2023 Q4 — CCW / Thermal Barrier Rupture Indications

2023 Q4 — CCW / Thermal Barrier Rupture Indications

⚠️ DRAFT
Q4 — CCW / Thermal Barrier Rupture Indications APE 26 G2.1.19 (3.9)
Given:
• Salem Unit 2 is at 100% power
• The operating crew suspects an RCP Thermal Barrier rupture.

Which of the following indications would provide corroborating evidence for this condition?

1. 2R17 A/B, Component Cooling Radiation Monitors, in Warning
2. PZR level rising
3. CCW Surge Tank level rising
4. Charging flow lowering
5. 2CC131, RCP Thermal Barrier Valve, goes closed
A. 1 and 3 Only
B. 2 and 4 Only
C. 2, 4, and 5 Only
D. 1, 3, and 5 Only
▶ Show Answer & Explanation
✗ A. Incorrect. While indications 1 and 3 are correct, this choice is missing indication 5 (2CC131 goes closed on high CCW flow to the Thermal Barrier).
✗ B. Incorrect. PZR level would NOT rise — RCS is leaking OUT to the CCW system. Charging flow would NOT lower as a direct indication of thermal barrier rupture.
✗ C. Incorrect. PZR level would NOT rise and charging flow would NOT lower. While 2CC131 closing is correct, indications 2 and 4 are not valid corroborating evidence for a thermal barrier rupture.
✓ D. Correct. A Thermal Barrier leak will cause CCW surge tank to rise as RCS will be leaking into the CCW system, RCS in-leakage will also be identified as a rise in the 2R17 A or B radiation monitors that monitors activity in the CCW system, and the 2CC131 valve will also close on high CCW flow to the Thermal Barrier due to a thermal barrier leak. Choices 1, 3, and 5 are the correct indications. PZR level would NOT rise (RCS is leaking OUT to CCW). Charging flow would NOT lower.
Ref: S2.OP-AB.CC-0001 (R20) | LO: NOS05CCW000-16, Obj 4.c | Source: New | Cognitive: Comprehension/Analysis

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