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Exams > 2019 Q96 — Radiation Monitoring LCO 3.3.3.1

2019 Q96 — Radiation Monitoring LCO 3.3.3.1

⚠️ DRAFT
Q96 — Radiation Monitoring LCO 3.3.3.1 G2.2.42 (4.6)
Given:
REFERENCE PROVIDED

• Unit 2 is at 100% Reactor Power and stable
• The crew is performing S2.OP-SO.CBV-0002 (Containment Pressure - Vacuum Relief System Operation) Section 5.3, "Performing a Containment Vacuum Relief"
• 2R12A (CNTMT NOBLE GAS) and 2R41D (PLANT VENT NOBLE GAS RELEASE RATE) have BOTH just failed

In accordance with Technical Specifications, which ONE of the following completes the statement below?

LCO 3.3.3.1 (RADIATION MONITORING INSTRUMENTATION) is __
A. NOT met and the crew must perform Action 24 ONLY
B. NOT met and the crew must perform Action 26 ONLY
C. NOT met and the crew must perform Actions 24 and 26
D. met because redundant radiation monitors are OPERABLE
▶ Show Answer & Explanation
✓ C. Correct. When analyzing LCO 3.3.3.1 against the given plant conditions, the candidate will need to analyze Table 3.3-6. To properly analyze Table 3.3-6, the candidate must also know information contained in the Bases of LCO 3.3.3.1. 2R12A is the credited monitor to meet the Table 3.3-6 requirements of 2.a.1.a (Containment - Gaseous Activity - Purge & Pressure Vacuum Relief Isolation) and 2.a.1.b (Containment - Gaseous Activity - RCS Leak Detection). Since S2.OP-SO.CBV-0002 (Containment Pressure - Vacuum Relief System Operation) Section 5.3, "Performing a Containment Vacuum Relief" is in progress, 2R41 (2R41A, B and D) can also be used to meet the requirements of Table 3.3-6 requirements of 2.a.1.a (Containment - Gaseous Activity - Purge & Pressure Vacuum Relief Isolation). Consequently, with 2R12A and 2R41D failed, LCO 3.3.3.1 (RADIATION MONITORING INSTRUMENTATION) is NOT met and the crew must perform Actions 24 and 26.
✗ A. Incorrect but plausible. The candidate could correctly conclude that 2R12A only meets the Table 3.3-6 requirements of 2.a.1.a (Containment - Gaseous Activity - Purge & Pressure Vacuum Relief Isolation) and 2.a.1.b (Containment - Gaseous Activity - RCS Leak Detection). However, the candidate could then incorrectly conclude that only one 2R41 channel is required to be an alternate monitor to meet Table 3.3-6 requirements of 2.a.1.a (Containment - Gaseous Activity - Purge & Pressure Vacuum Relief Isolation). This would cause the candidate to incorrectly conclude that the crew would only be required to perform Action 24.
✗ B. Incorrect but plausible. The candidate could incorrectly conclude that with 2R12A and 2R41D failed that the Table 3.3-6 requirements of 2.a.1.a (Containment - Gaseous Activity - Purge & Pressure Vacuum Relief Isolation) is not met. This would cause the candidate to incorrectly conclude that the crew would only be required to perform Action 26.
✗ D. Incorrect but plausible. Since there are multiple 2R12s (2R12A, 2R12B, 2R12C) and multiple 2R41s (A-D), the candidate could incorrectly conclude that LCO 3.3.3.1 is met with ONLY a failure of 2R12A and 2R41D.
Ref: Technical Specifications, LCO 3.3.3.1 | LO: NOS05CONTMT-15 (CONTAINMENT AND CONTAINMENT SUPPORT SYSTEMS) | Source: Modified Bank (ILOT 16-01 NRC SRO 014) | Cognitive: Higher

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