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Exams > 2023 Q33 — CCW System Response to LOCA + LOOP / SEC Mode 3

2023 Q33 — CCW System Response to LOCA + LOOP / SEC Mode 3

⚠️ DRAFT
Q33 — CCW System Response to LOCA + LOOP / SEC Mode 3 008 K5.10 (3.1)
Given:
• Salem Unit 2 experienced a LOCA and a Loss of Off-site Power
• The crew is implementing 2-EOP-TRIP-1, Reactor Trip or Safety Injection

Which of the following describes the operational impact on the Component Cooling Water System (CCW) and the reason why?
A. CCW pumps remain running, both HXs available.
B. No CCW pumps running; SW to CCW HXs auto-isolated to prevent SW pump runout.
C. No CCW pumps running; SW to CCW HXs must be manually isolated.
D. All CCW pumps running; SW to CCW HXs isolated.
▶ Show Answer & Explanation
✓ B. Correct. SEC Mode 3 (SI + Blackout): all CCW pumps are tripped. SW to CCW HXs is auto-isolated to prevent SW pump runout with only 3 SW pumps available on emergency power. CCW pumps are not sequenced onto the EDGs due to loading concerns. CCW pumps are started later per EOP-APPX-1 when needed for cold leg recirculation.
✗ A. Incorrect. This describes SEC Mode 1 (SI only, no blackout). In a concurrent LOCA + LOOP (SEC Mode 3), CCW pumps are tripped and not sequenced onto EDGs.
✗ C. Incorrect. No CCW pumps running is correct, but SW to CCW HXs is auto-isolated in SEC Mode 3, not manually isolated. The auto-isolation prevents SW pump runout.
✗ D. Incorrect. This describes SEC Mode 2 (blackout only, no SI). In a concurrent LOCA + LOOP (SEC Mode 3), CCW pumps are tripped, not running.
Ref: NOS05CCW000-15 | Source: New | Cognitive: Comprehension/Analysis

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