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Exams > 2023 Q81 — SG Tube Leak Action Levels

2023 Q81 — SG Tube Leak Action Levels

⚠️ DRAFT
Q81 — SG Tube Leak Action Levels T1G1 APE 037 G2.1.25 (4.2)
Given:
• Salem Unit 2 is at 100% power
• The crew is performing S2.OP-AB.SG-0001, Steam Generator Tube Leak, due to a confirmed tube leak on one SG
• Chemistry is performing hourly trends of primary to secondary leak rates

Chemistry leak rates are as follows:

TimeSG Leak Rate (gpd)
020040
030060
040090
0500125

Based on the above trends, what is the HIGHEST action that the CRS should direct in accordance with S2.OP-AB.SG-0001?

[REFERENCE PROVIDED]
A. Be in MODE 3 in less than or equal to 24 hours.
B. Be in MODE 3 within 6 hours.
C. Reduce power to less than or equal to 50% within 1 hour AND be in MODE 3 in the following 2 hours.
D. Trip the reactor and actuate Safety Injection.
▶ Show Answer & Explanation
✓ C. Correct. Per S2.OP-AB.SG-0001 Attachment 1 step 1.B (Action Level 3) with leak rate at greater than or equal to 75 gpd and a rate of change greater than or equal to 30 gpd/hr, then reduce power less than or equal to 50% in 1 hour and place the unit in MODE 3 in the following 2 hours.
✗ A. Plausible because this is an action per Attachment 1 for Action Level 1.
✗ B. Plausible because this is an action per Attachment 1 for Action Level 3 if leakrate is >= 150 gpd.
✗ D. Plausible because this is an action directed in Attachment 1.
Ref: S2.OP-AB.SG-0001 (R34) | LO: NOS05ABSGTL-06, Obj 3 — Given a set of initial plant conditions: Describe the plant response to actions taken in the abnormal procedure | Source: New | Cognitive: Comprehension/Analysis

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