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Exams > 2019 Q77 — LOCA-1 RWST Lo Transfer to Cold Leg Recirc

2019 Q77 — LOCA-1 RWST Lo Transfer to Cold Leg Recirc

⚠️ DRAFT
Q77 (SRO) — LOCA-1 RWST Lo Transfer to Cold Leg Recirc EPE: 011 Large Break LOCA-G2.1.27 (3.9)
Given:
• The crew is performing 2-EOP-LOCA-1 (LOSS OF REACTOR COOLANT)

At time 11:00
• The RWST LEVEL LO alarm has actuated
• RCS Pressure is 125 psig and slowly lowering
• Containment Pressure is 20 psig and slowly rising
• ALL T-COLDS are 325 °F and slowly lowering

In accordance with 2-EOP-LOCA-1, which ONE of the following completes the statements below?

The crew will ___
A. REMAIN in 2-EOP-LOCA-1
B. PERFORM 2-EOP-LOCA-1 and S2.OP-SO.CVC-0006 Section 5.8 (Makeup to RWST Using CVCS Makeup System) CONCURRENTLY
C. GO TO 2-EOP-LOCA-4 (TRANSFER TO HOT LEG RECIRCULATION)
D. GO TO 2-EOP-LOCA-3 (TRANSFER TO COLD LEG RECIRCULATION)
▶ Show Answer & Explanation
✓ D. Correct. IAW 2-EOP-LOCA-1, the crew will go to 2-EOP-LOCA-3 (TRANSFER TO COLD LEG RECIRCULATION) when the "RWST LEVEL LO" ALARM actuates.
✗ A. The candidate could incorrectly determine that remaining in 2-EOP-LOCA-1 (LOSS OF REACTOR COOLANT) is correct and the lowering RWST level will not be addressed until the "RWST LEVEL LO-LO" ALARM actuates.
✗ B. Since the "RWST LEVEL LO" ALARM has actuated, the candidate could incorrectly conclude that the crew is required to perform 2-EOP-LOCA-1 and S2.OP-SO.CVC-0006 Section 5.8 (Makeup to RWST Using CVCS Makeup System) CONCURRENTLY.
✗ C. The candidate could correctly identify the need to swap ECCS pump suctions to the containment sump when the "RWST LEVEL LO" ALARM actuates, but incorrectly conclude that performance of 2-EOP-LOCA-4 (TRANSFER TO HOT LEG RECIRCULATION) is required.
Ref: 2-EOP-LOCA-1 | LO: NOS05LOCA01-05 | Source: New | Cognitive: Higher

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