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Exams > 2018 Q63 — LOCA Outside Containment RH19 Isolation and RCS Pressure [OUTDATED]

2018 Q63 — LOCA Outside Containment RH19 Isolation and RCS Pressure [OUTDATED]

⛔ OUTDATED
Q63 — LOCA Outside Containment RH19 Isolation and RCS Pressure [OUTDATED] EPE: LOCA Outside Containment-EA1.2 (3.6)
Given:
• The crew has just transitioned to 1-EOP-LOCA-6 (LOCA Outside Containment)

In accordance with 1-EOP-LOCA-6, which ONE of the following completes the statements below?

As part of the leak isolation strategy, the crew _(1)_ separate the 11 and 12 RHR discharge lines by closing 11RH19 (RHR Discharge X-CONN Valve) and 12RH19 (RHR Discharge X-CONN Valve).

The crew will monitor rising _(2)_ to determine when the leak has been successfully isolated.

(1)(2)
A. will / RCS pressure
B. will / Pressurizer level
C. will NOT / RCS pressure
D. will NOT / Pressurizer level
▶ Show Answer & Explanation
✓ A. Correct. For Part 1, IAW 1-EOP-LOCA-6 Step 2, the crew will close 11RH19 and 12RH19 which will separate the 11 and 12 RHR discharge lines. This will enhance the operator's ability to diagnose the success or failure of leak isolation. For Part 2, IAW 1-EOP-LOCA-6, the crew will monitor rising RCS Pressure to determine when the leak has been successfully isolated.
✗ B. Incorrect but plausible. Part 1 is correct. For Part 2, since ECCS flow is injecting water into the core during performance of 1-EOP-LOCA-6, RCS inventory will increase once the leak has been isolated. An increase in RCS inventory can be measured by rising PZR level. Consequently, the candidate could incorrectly conclude that 1-EOP-LOCA-6 monitors rising PZR level as a determination that the leak has been successfully isolated.
✗ C. Incorrect but plausible. For Part 1, separating the 11 and 12 RHR discharge lines is not required to isolate the leak when performing 1-EOP-LOCA-6. Consequently, the candidate could fail to recognize the advantage of separating the 11 and 12 RHR discharge lines and incorrectly conclude that closing 11RH19 and 12RH19 is not required per 1-EOP-LOCA-6. Part 2 is correct.
✗ D. Incorrect but plausible. For Part 1, separating the 11 and 12 RHR discharge lines is not required to isolate the leak when performing 1-EOP-LOCA-6. Consequently, the candidate could fail to recognize the advantage of separating the 11 and 12 RHR discharge lines and incorrectly conclude that closing 11RH19 and 12RH19 is not required per 1-EOP-LOCA-6. For Part 2, since ECCS flow is injecting water into the core during performance of 1-EOP-LOCA-6, RCS inventory will increase once the leak has been isolated. An increase in RCS inventory can be measured by rising PZR level. Consequently, the candidate could incorrectly conclude that 1-EOP-LOCA-6 monitors rising PZR level as a determination that the leak has been successfully isolated.
Ref: EOP-LOCA-6 (LOCA Outside Containment) | LO: NOS05LOCA06-03 — Describe the EOP mitigation strategy during LOCA OUTSIDE CONTAINMENT | Source: New | Cognitive: Lower

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