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Exams > 2019 Q57 — SGFP Trip Below P-10 and AFW Pump Start

2019 Q57 — SGFP Trip Below P-10 and AFW Pump Start

⚠️ DRAFT
Q57 — SGFP Trip Below P-10 and AFW Pump Start APE: 054 Loss of MFW-AA2.03 (4.1)
Given:
• Unit 1 is at 8% Reactor Power
• 11 SGFP is in service
• 11 CN Pump and 12 CN Pump are in service

At time 18:00
• 11 SGFP Trips
• ALL SG NR levels are 33% and lowering
• The crew enters S1.OP-AB.CN-0001 (MAIN FEEDWATER/CONDENSATE SYSTEM ABNORMALITY)

In accordance with S1.OP-AB.CN-0001, which ONE of the following completes the statements below?

The crew will ___
A. TRIP the Reactor AND GO TO 1-EOP-TRIP-1 (Reactor Trip or Safety Injection)
B. REDUCE Reactor Power to less than 4%, then START 11 and 12 AFW Pumps
C. REDUCE Reactor Power to less than 4%, then START 12 SGFP
D. IMMEDIATELY start 12 SGFP
▶ Show Answer & Explanation
✓ B. Correct. Since Reactor Power is less than P-10 (10% Power), then IAW S1.OP-AB.CN-0001 Steps 3.2, 3.3, 3.14, 3.15, 3.16 and 3.17, the crew will REDUCE Reactor Power to less than 4%, then START 11 and 12 AFW Pump.
✗ A. Incorrect but plausible. There are multiple criteria in the S1.OP-AB.CN-0001 CAS that required a reactor trip. Consequently, the candidate could misapply the plant conditions to the CAS and incorrectly conclude that a Reactor Trip is required.
✗ C. Incorrect but plausible. Since 12 SGFP is available and has a greater feed capacity than the AFW system, the candidate could incorrectly conclude that the 12 SGFP should be started once Reactor power is lowered below 4%.
✗ D. Incorrect but plausible. Since 12 SGFP is available and has a greater feed capacity than the AFW system and SG levels are lowering, the candidate could incorrectly conclude that the 12 SGFP should be started immediately.
Ref: S1.OP-AB.CN-0001 | LO: NOS05ABCN01-06 (MAIN FEEDWATER/CONDENSATE SYSTEM ABNORMALITY) | Source: New | Cognitive: Higher

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