Q61 — ECAC Start Criteria and BF19 Control Air
APE: 065 Loss of Instrument Air-AK3.04 (3.0)
Given:
• Unit 1 and Unit 2 are BOTH at 100% Reactor Power
At time 20:00
• S1.OP-AB.CA-0001 (LOSS OF CONTROL AIR) and S2.OP-AB.CA-0001 (LOSS OF CONTROL AIR) are entered due to a large Station Air leak
In accordance with S1.OP-AB.CA-0001 and S2.OP-AB.CA-0001, which ONE of the following completes the statements below?
The crews will MANUALLY start the 1 Emergency Control Air Compressor and 2 Emergency Control Air Compressor when the 1A/1B/2A/2B Control Air Headers lower to a MAXIMUM of _(1)_ psig.
Ensuring proper operation of the BF19s (Main Feedwater Control Valves) _(2)_ a reason for MANUALLY starting the Emergency Air Compressors in S1.OP-AB.CA-0001 and S2.OP-AB.CA-0001.
• Unit 1 and Unit 2 are BOTH at 100% Reactor Power
At time 20:00
• S1.OP-AB.CA-0001 (LOSS OF CONTROL AIR) and S2.OP-AB.CA-0001 (LOSS OF CONTROL AIR) are entered due to a large Station Air leak
In accordance with S1.OP-AB.CA-0001 and S2.OP-AB.CA-0001, which ONE of the following completes the statements below?
The crews will MANUALLY start the 1 Emergency Control Air Compressor and 2 Emergency Control Air Compressor when the 1A/1B/2A/2B Control Air Headers lower to a MAXIMUM of _(1)_ psig.
Ensuring proper operation of the BF19s (Main Feedwater Control Valves) _(2)_ a reason for MANUALLY starting the Emergency Air Compressors in S1.OP-AB.CA-0001 and S2.OP-AB.CA-0001.
A. (1) 100 (2) is NOT
B. (1) 100 (2) is
C. (1) 88 (2) is NOT
D. (1) 88 (2) is
▶ Show Answer & Explanation
✓ C. Correct. For Part 1 and IAW S1.OP-AB.CA-0001 and S2.OP-AB.CA-0001, the crews will MANUALLY start the 1 Emergency Control Air Compressor and 2 Emergency Control Air Compressor when the 1A/1B/2A/2B Control Air Headers lower to a MINIMUM of 88 psig. For Part 2 and IAW S1.OP-AB.CA-0001 and S2.OP-AB.CA-0001, ensuring proper operation of the BF19s (Main Feedwater Control Valves) is NOT a reason for MANUALLY starting the Emergency Air Compressors in S1.OP-AB.CA-0001 and S2.OP-AB.CA-0001.
✗ A. Incorrect but plausible. For Part 1, 100 psig is CA pressure at which the remaining Station Air Compressor is started IAW S1/S2.OP-AB.CA-0001. Consequently, the candidate could incorrectly conclude that the crews will MANUALLY start the 1 Emergency Control Air Compressor and 2 Emergency Control Air Compressor when the 1A/1B/2A/2B Control Air Headers lower to a MINIMUM of 100 psig. Part 2 is correct.
✗ B. Incorrect but plausible. For Part 1, 100 psig is CA pressure at which the remaining Station Air Compressor is started IAW S1/S2.OP-AB.CA-0001. Consequently, the candidate could incorrectly conclude that the crews will MANUALLY start the 1 Emergency Control Air Compressor and 2 Emergency Control Air Compressor when the 1A/1B/2A/2B Control Air Headers lower to a MINIMUM of 100 psig. For Part 2, proper operation of AOVs is a reason to start the ECACs. However, check valves in the CA system prevent the ECACs from supplying the BF19s. Consequently, the candidate could incorrectly conclude that the reason for MANUALLY starting the Emergency Air Compressors is to ensure proper operation of the BF19s.
✗ D. Incorrect but plausible. Part 1 is correct. For Part 2, proper operation of AOVs is a reason to start the ECACs. However, check valves in the CA system prevent the ECACs from supplying the BF19s. Consequently, the candidate could incorrectly conclude that the reason for MANUALLY starting the Emergency Air Compressors is to ensure proper operation of the BF19s.
Ref: S1.OP-AB.CA-0001 (LOSS OF CONTROL AIR) and S2.OP-AB.CA-0001 (LOSS OF CONTROL AIR) | LO: NOS05ABCA01-07 | Source: New | Cognitive: Lower
Connections
- Related systems: Control Air
- Related procedures: AB.CA-0001 — Loss of Control Air
- Related exam: 2019 NRC Written Exam