Q13 — CFCU Power Supplies
022 CCS-K2.01 (3.0)
Given:
• A Reactor Trip and Safety Injection have occurred at Unit 1
• 1A 4KV Vital Bus is de-energized
Which ONE of the following completes the statement below?
ONLY ___ CFCU(s) is/are stopped.
• A Reactor Trip and Safety Injection have occurred at Unit 1
• 1A 4KV Vital Bus is de-energized
Which ONE of the following completes the statement below?
ONLY ___ CFCU(s) is/are stopped.
A. 11 and 12
B. 11
C. 15
D. 14 and 15
▶ Show Answer & Explanation
✓ B. Correct. With 1A 4KV Vital bus de-energized, ONLY 11 CFCU is stopped.
✗ A. Incorrect but plausible. Since there are 5 CFCUs powered from 3 vital buses, any distractor that has one or two CFCUs stopped is plausible.
✗ C. Incorrect but plausible. Since there are 5 CFCUs powered from 3 vital buses, any distractor that has one or two CFCUs stopped is plausible.
✗ D. Incorrect but plausible. Since there are 5 CFCUs powered from 3 vital buses, any distractor that has one or two CFCUs stopped is plausible.
Ref: NOS054KVAC0-08 (4160 Electrical System) | LO: NOS05CONTMT-15 LO 17 — State the power supply to Containment and Containment Support Systems components, including voltage level and 1E/Non 1E (CFCU breaker alignment for Fast and Slow speed) | Source: New | Cognitive: Higher
Connections
- Related systems: CFCUs, 4KV
- Related exam: 2019 NRC Written Exam