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Exams > 2019 Q91 — Hydrogen Recombiner EOP-LOCA-1

2019 Q91 — Hydrogen Recombiner EOP-LOCA-1

⚠️ DRAFT
Q91 — Hydrogen Recombiner EOP-LOCA-1 028 HRPS-A2.03 (4.0)
Given:
REFERENCE PROVIDED

• The crew is performing 1-EOP-LOCA-1 (LOSS OF REACTOR COOLANT) Step 24, "Containment Hydrogen Concentration Verification"
• Containment Hydrogen concentration is 0.7%

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

The crew will
A. START ONLY ONE Hydrogen Recombiner by performing S1.OP-SO.CAN-0001 (HYDROGEN RECOMBINER OPERATION) CONCURRENTLY with 1-EOP-LOCA-1
B. START BOTH Hydrogen Recombiners by performing S1.OP-SO.CAN-0001 (HYDROGEN RECOMBINER OPERATION) CONCURRENTLY with 1-EOP-LOCA-1
C. CONTINUE in 1-EOP-LOCA-1 until Containment Hydrogen concentration reaches 4.0%
D. CONSULT TSC for additional recovery actions and REMAIN in 1-EOP-LOCA-1
▶ Show Answer & Explanation
✓ A. Correct. IAW 2-EOP-LOCA-1, the crew will start ONLY one Hydrogen Recombiner when Containment Hydrogen Concentration is greater than 0.5%.
✗ B. Incorrect but plausible. The candidate could recognize the need to start the Hydrogen Recombiners based on Containment concentration level, but incorrectly conclude that BOTH Hydrogen Recombiners need to be started.
✗ C. Incorrect but plausible. The candidate could incorrectly conclude that 1-EOP-LOCA-1 will be performed until Hydrogen Concentration reaches 4.0%.
✗ D. Incorrect but plausible. Consulting the TSC would have been proper if Containment Concentration was greater than 4.0%.
Ref: 1-EOP-LOCA-1 | LO: NOS05LOCA01-05 (EOP-LOCA-01, LOSS OF REACTOR COOLANT AND LOSS OF COOLANT ACCIDENT ANALYSIS) | Source: Modified Bank | Cognitive: Higher

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