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Exams > 2023 Q16 — LOCA Outside Containment / SI Pump Leak Isolation

2023 Q16 — LOCA Outside Containment / SI Pump Leak Isolation

⚠️ DRAFT
Q16 — LOCA Outside Containment / SI Pump Leak Isolation W E04 EA1.04 (3.8)
Given:
• LOCA per EOP-LOCA-6
• All ECCS pumps running
• Suspected SI pump cold leg discharge leak
• RCS 1700 psig steady

What indicates a leak and which valve isolates it?
A. SI flows 200 gpm, close 2SJ135
B. SI flows 200 gpm, close 21/22 SJ49
C. SI pressure 1700 psig, close 21/22 SJ49
D. SI pressure 1700 psig, close 2SJ135
▶ Show Answer & Explanation
✓ A. Correct. RCS at 1700 psig is above SI pump shutoff head (1520 psig). Flow indicated on SI pumps means a leak exists on cold leg(s). Per EOP-LOCA-6 step 2, 2SJ135 Cold Leg Discharge Valve is closed to isolate SI pump cold leg leak.
✗ B. SJ49s are used to isolate RHR cold legs, not SI cold legs. Flow is the correct indicator but the isolation valve is wrong.
✗ C. SJ49s isolate RHR cold legs, not SI cold legs. SI pump discharge pressure alone does not confirm a leak — flow is the indicator since RCS pressure is above shutoff head.
✗ D. SI pump discharge pressure alone does not confirm a leak — flow is the indicator since RCS pressure is above shutoff head. 2SJ135 is the correct valve but the wrong confirming indication.
Ref: 2-EOP-LOCA-6 (R41) & bases | LO: NOS05LOCA06-05, Obj 5 | Source: New | Cognitive: Comprehension/Analysis

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