Q31 — AMSAC Train A AFW Pumps
016 NNIS-K1.06 (3.6)
Given:
• Unit 2 is at 45% Reactor Power
At time 14:00
• A malfunction within AMSAC causes ONLY Train A of AMSAC to actuate
Which ONE of the following completes the statement below?
The actuation of Train A of AMSAC will send an AUTOMATIC start signal to ___ AFW Pump(s).
• Unit 2 is at 45% Reactor Power
At time 14:00
• A malfunction within AMSAC causes ONLY Train A of AMSAC to actuate
Which ONE of the following completes the statement below?
The actuation of Train A of AMSAC will send an AUTOMATIC start signal to ___ AFW Pump(s).
A. ALL
B. ONLY 21
C. ONLY 21 and 22
D. ONLY 21 and 23
▶ Show Answer & Explanation
✓ D. Correct. The 21 AFW receives an AUTOMATIC start signal when AMSAC Train A actuates. The 22 AFW receives an AUTOMATIC start signal when AMSAC Train B actuates. The 23 AFW receives an AUTOMATIC start signal when either train of AMSAC actuates. Consequently, when ONLY Train A of AMSAC actuates, 21 and 23 AFW Pumps receive an AUTOMATIC start signal.
✗ A. Incorrect but plausible. The candidate could not understand how AMSAC circuitry works and incorrectly conclude that ALL AFW pumps receive an AUTOMATIC start signal.
✗ B. Incorrect but plausible. The candidate could not understand how AMSAC circuitry works and incorrectly conclude that ONLY 21 pump receives an AUTOMATIC start signal.
✗ C. Incorrect but plausible. The candidate could not understand how AMSAC circuitry works and incorrectly conclude that ONLY 21 and 22 AFW pumps receive an AUTOMATIC start signal.
Ref: NOS05AFW000-16 (AUXILIARY FEEDWATER SYSTEM) | LO: NOS05RXPROT-13 (REACTOR PROTECTION SYSTEM), Obj 12 — Outline the interlocks associated with AFW System components: a. AFW Pump Automatic Start | Source: Bank — ILOT 1601 AUDIT RO Q19 | Cognitive: Comprehension/Analysis
Connections
- Related systems: AMSAC, AFW
- Related exam: 2019 NRC Written Exam