Q60 — SW Nuclear Header Leak Location
APE: 062 Loss of Nuclear Service Water-A2.02 (2.9)
Given:
• Unit 2 is at 100% Reactor Power with Service Water in its normal summer alignment
At time 16:00
• Service Water pressure to the following Service Water loads are lowering:
21 CC Pump, 21 CS Pump, 21 CFCU, and other loads on the 21 SW Nuclear Header
Which ONE of the following completes the statements below?
Assuming there is a leak on the piping CLOSEST to the affected Service Water loads (causing the low Service Water pressure), then the leak is ___
• Unit 2 is at 100% Reactor Power with Service Water in its normal summer alignment
At time 16:00
• Service Water pressure to the following Service Water loads are lowering:
21 CC Pump, 21 CS Pump, 21 CFCU, and other loads on the 21 SW Nuclear Header
Which ONE of the following completes the statements below?
Assuming there is a leak on the piping CLOSEST to the affected Service Water loads (causing the low Service Water pressure), then the leak is ___
A. downstream of 2SW26 (TURB AREA SW MOV)
B. downstream of 22SW22 (NUCLEAR HEADER)
C. downstream of 21SW22 (NUCLEAR HEADER)
D. between 21SW23 (NUCLEAR HEADER TIE VLV) and 22SW23 (NUCLEAR HEADER TIE VLV)
▶ Show Answer & Explanation
✓ C. Correct. The affected SW loads are all cooled from the 21 SW Nuclear Header. Consequently, the leak is downstream of 21SW22.
✗ A. Incorrect but plausible. Since all of the distractors contain piping associated with the SW system, then all of the distractors are plausible.
✗ B. Incorrect but plausible. Since all of the distractors contain piping associated with the SW system, then all of the distractors are plausible.
✗ D. Incorrect but plausible. Since all of the distractors contain piping associated with the SW system, then all of the distractors are plausible.
Ref: 205342-SIMP | LO: NOS05SWONUC-14 (SERVICE WATER - NUCLEAR HEADER) | Source: New | Cognitive: Higher
Connections
- Related systems: Service Water, CCW, Containment Spray, CFCUs
- Related exam: 2019 NRC Written Exam