Q48 — EDG Starting Air Compressor Power Supplies
T2G1 064 K2.01 (3.0)
What are the power supplies to the 2A EDG starting air compressors 21A and 21B?
A. 21A: 2A 230V Vital Bus / 21B: 2A 230V Vital Bus
B. 21A: 2A 230V Vital Bus / 21B: 2B 230V Vital Bus
C. 21A: 2A 460V Vital Bus / 21B: 2A 460V Vital Bus
D. 21A: 2A 460V Vital Bus / 21B: 2B 460V Vital Bus
▶ Show Answer & Explanation
✓ A. Correct. Each EDG two starting air compressors are supplied from its associated bus 230V vital bus. The 21A and 21B starting air compressors are both powered from 2A 230V Vital Bus.
✗ B. Incorrect. Plausible because the operator may believe that the 21B starting air compressor is powered from the other EDG 230V vital bus. Incorrect in that both starting air compressors are powered from the same 2A 230V vital power.
✗ C. Incorrect. Plausible because the operator may incorrectly recall and believe that the starting air compressors are powered from 2A 460V vital bus. Incorrect in that both starting air compressors are powered from the same 2A 230V vital power.
✗ D. Incorrect. Plausible because the operator may believe that the 21B starting air compressor is powered from the other EDG 460V vital bus. Incorrect in that both starting air compressors are powered from the same 2A 230V vital power.
Ref: NOS05EDG000-15 | Source: New | Cognitive: Fundamental/Memory
K/A: 064 K2.01 — Knowledge of electrical power supplies to the following Emergency Diesel Generator System: Starting air compressor
K/A: 064 K2.01 — Knowledge of electrical power supplies to the following Emergency Diesel Generator System: Starting air compressor
Connections
- Related systems: EDGs, 500KV
- Related procedures:
- Related exam: 2023 NRC Written Exam