Q54 — Emergency Control Air Compressor Power Supply
078000K2.02 (3.3)
Given:
• Unit 1 is at 100% Power.
• The #1 Emergency Control Air Compressor (ECAC) is running for testing in accordance with S1.OP-PT.CA-0001, Emergency Control Air Compressor Test.
Which ONE of the following would result in the loss of the #1 ECAC?
• Unit 1 is at 100% Power.
• The #1 Emergency Control Air Compressor (ECAC) is running for testing in accordance with S1.OP-PT.CA-0001, Emergency Control Air Compressor Test.
Which ONE of the following would result in the loss of the #1 ECAC?
A. 1A 4KV to 460V breaker 1A4D trips.
B. 1C 4KV to 460V breaker 1C4D trips.
C. 1E 4KV to 460V breaker 1E6D trips.
D. 1H 4KV to 460V breaker 1H5D trips.
▶ Show Answer & Explanation
✓ B. Correct. The 1C 460V Vital Bus feeds the #1ECAC.
✗ A. Plausible because the candidate may believe that 1A 460V Vital Bus feeds the #1ECAC.
✗ C. Plausible because the candidate may believe that the 1E 460V Group Bus feeds the #1ECAC. The group buses provide power to Station Air Compressors, but 4KV and not 1E.
✗ D. Plausible because the candidate may believe that 1H 460V Group Bus feeds the #1 ECAC. The 1H group bus provides power to #1 Station Air Compressor, but 4KV.
Ref: NOS05CONAIR-12, Control Air System. | LO: ELO 5 | Source: Bank, Salem 2016 NRC Exam, Q62 | Cognitive: Fundamental
Connections
- Related systems: Control Air, 460/230V AC
- Related procedures: S1.OP-PT.CA-0001 — Emergency Control Air Compressor Test
- Related exam: 2020 NRC Written Exam