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Exams > 2018 Q89 — R12A Failure / TS 3.3.3.1 Radiation Monitoring

2018 Q89 — R12A Failure / TS 3.3.3.1 Radiation Monitoring

⚠️ DRAFT
Q89 — R12A Failure / TS 3.3.3.1 Radiation Monitoring 073 PRM System-A2.01 (3.2)
REFERENCE PROVIDED

Given:
• 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) has 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 Actions 24 and 26
B. NOT met and the crew must perform Action 26 ONLY
C. NOT met and the crew must perform Action 24 ONLY
D. met
▶ 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. R12A 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 failed, LCO 3.3.3.1 (RADIATION MONITORING INSTRUMENTATION) is NOT met and the crew must perform Action 24 ONLY.
✗ A. The candidate could correctly conclude that R12A 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 R41 is not allowed to be an alternate monitor to meet Table 3.3-6 requirements of 2.a.1.a. Consequently, the crew would only be required to perform Actions 24 and 26.
✗ B. The candidate could incorrectly conclude that R12A only meets the Table 3.3-6 requirements of 2.a.1.a (Containment - Gaseous Activity - Purge & Pressure Vacuum Relief Isolation). Consequently, the crew would only be required to perform Action 26.
✗ D. Since there are multiple R12s (R12A, R12B, R12C) and multiple R41s (A-D), the candidate could incorrectly conclude that LCO 3.3.3.1 is met with ONLY a failure of R12A.
Ref: Technical Specifications (LCO 3.3.3.1 provided as reference) | LO: NOS05CONTMT-15 (CONTAINMENT AND CONTAINMENT SUPPORT SYSTEMS) — 9. Given a situation dealing with Containment and Containment Support Systems operability, examine the situation and apply the appropriate Technical Specification action. | Source: New | Cognitive: Higher

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