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Exams > 2022 Q52 — SW122 CC HX Inlet Valve SEC Response

2022 Q52 — SW122 CC HX Inlet Valve SEC Response

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Q52 — SW122 CC HX Inlet Valve SEC Response 076 K1.16 (3.6)
Which ONE of the following identifies when the 21(22)SW122, CC HX Inlet Valves, automatically reposition and why?

The 21(22)SW122 valves...
A. close on a SI signal coincident with a LOOP to ensure SW pump runout does not occur with all CFCUs running.
B. fully open on a SI signal coincident with a LOOP to ensure cool CCW is supplied to the RHR HXs and pump seals.
C. fully open on a SI signal to ensure cool CCW is supplied to the RHR HXs and pump seals.
D. close on a SI signal to ensure SW pump runout does not occur with all CFCUs running.
▶ Show Answer & Explanation
✓ A. Correct. The SW122s will only close on a SEC Mode III (SI and Blackout or LOOP). The purpose of this is to ensure that the SW pumps do not reach runout conditions with all CFCUs running and considering only two SW pumps are running (single active failure).
✗ B. Incorrect. Plausible because the SW122s will be throttled to maintain CC HX outlet temperature at setpoint during SEC Mode I (SI only) or Mode II (blackout only). The applicant may confuse the SEC Mode ops and determine that the SW122s will go fully open during a SEC Mode Op III condition.
✗ C. Incorrect. Plausible because the SW122s will be throttled to maintain CC HX outlet temperature at setpoint during SEC Mode I (SI only). The SW122s will not go fully open upon receipt of an SI signal. The applicant may confuse the operation of the SW122 during SEC Mode ops and believe that the valve will go fully open. It is also plausible to believe that SW122 opening does allow for maximum cooling of the CCW system.
✗ D. Incorrect. Plausible because the applicant may confuse the SEC Modes of operation and believe that the Mode I (SI only) closes the SW122's.
Ref: NOS05SW0NUC-15 | LO: NOS05SW0NUC-15, Obj 4.f — Describe the function of the following components and how their normal and abnormal operation affects the Service Water - Nuclear Header System: CC HX and SW122, SW127, SW380/383, SW376/379 | Source: Bank - Salem 2015 NRC RO16 | Cognitive: Fundamental/Memory

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