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Exams > 2020 Q14 — Service Water Bay Leak and Tech Spec

2020 Q14 — Service Water Bay Leak and Tech Spec

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Q14 — Service Water Bay Leak and Tech Spec 000062G2.2.40 (3.4)
Given:

• Unit 2 is at 100% Power.
• 24 Service Water Pump is Cleared & Tagged for a silt inspection.
• 21, 25, and 26 Service Water Pumps are in service.
• 23 Service Water Pump is in AUTO.

The following OHA alarms are received:

• B-13, 21 SW HDR PRESS LO
• B-14, 22 SW HDR PRESS LO
• B-29, 21-23 SW PUMP SMP AREA LVL HI

Which Abnormal Operating Procedure will isolate the identified service water leak, and once the leak is isolated, what Technical Specification LCO is applicable?
A. S2.OP-AB.SW-0001, Loss of Service Water Header Pressure; enter Tech Spec 3.7.4 for one INOPERABLE SW loop.
B. S2.OP-AB.SW-0003, Service Water Bay Leak; enter Tech Spec 3.0.3 for two INOPERABLE SW loops.
C. S2.OP-AB.SW-0003, Service Water Bay Leak; enter Tech Spec 3.7.4 for one INOPERABLE SW loop.
D. S2.OP-AB.SW-0001, Loss of Service Water Header Pressure; enter Tech Spec 3.0.3 for two INOPERABLE SW loops.
▶ Show Answer & Explanation
✗ A. Incorrect. Plausible because S2.OP-AB.SW-0001(Q), Loss of Service Water Header Pressure may be the first procedure entered due to responding to OHAs B-13 & B-14, low service water header pressures. This procedure also provides an attachment for isolating various leaks, the candidate may believe the steps for isolating a SW Bay are included. However, the loss of service water header pressure procedure will immediately transition the crew to S2.OP-AB.SW-0003(Q), Service Water Bay Leak which is the correct procedure. The Tech Spec entry of 3.7.4 is plausible because the LCO requires 2 operable loops and only one SW Bay has been isolated. This is not correct because the initial conditions also state that #24 SW Pump is C/Ted for silt inspection.
✓ B. Correct. S2.OP-AB.SW-0003(Q), Service Water Bay Leak is the correct mitigating procedure because the stem indicated OHA B-29, 21-23 SW PMP SMP AREA LVL HI was also alarming indicating a leaking #2 SW Bay and requiring isolation. Tech Spec 3.0.3 is applicable because S2.OP-SO.SW-0005(Q), Service Water System Operation, P&L 3.2 states; "When a Service Water Bay is removed from service in Modes 1-4, and the Service Water Pump fed from "B" bus in the OPERABLE Service Water Bay is unavailable (23 or 24 SWP), then L.C.O 3.0.3 is applicable." It is also system knowledge that an OPERABLE SW Loop consists of two service water pumps powered from separate buses.
✗ C. Incorrect. Plausible because the first part is correct and the Tech Spec entry of 3.7.4 is plausible because the LCO requires 2 operable loops and only one SW Bay has been isolated. This is not correct because the initial conditions also state that #24 SW Pump is C/Ted for silt inspection.
✗ D. Incorrect. Plausible because the Tech Spec entry requirement is correct. Also plausible because S2.OP-AB.SW-0001(Q), Loss of Service Water Header Pressure may be the first procedure entered due to responding to OHAs B-13 & B-14, low service water header pressure. This procedure also provides an attachment for isolating various leaks, the candidate may believe the steps for isolating a SW Bay are included.
Ref: S2.OP-AB.SW-0001(Q), Loss of Service Water Header Pressure and Bases. S2.OP-AB.SW-0003(Q), Service Water Bay Leak and Bases. S2.OP-SO.SW-0005(Q), Service Water System Operation. | LO: N/A | Source: New | Cognitive: Comprehension/Analysis

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