Q76 — CCW Restoration After LBLOCA + LOOP
000011EA2.07 (3.4)
Given:
• Unit 2 is at 100% Power.
• 21 Auxiliary Feedwater Pump is cleared and tagged for motor replacement.
• 22 CFCU is cleared and tagged for bearing replacement.
• A Large Break LOCA occurs concurrently with a Loss of Off-Site Power.
• The crew is currently implementing step 17, "CCW Pump Operation Evaluation", in accordance with 2-EOP-TRIP-1, Reactor Trip or Safety Injection.
Complete the following statement concerning component cooling water (CCW) system operation based on the above conditions:
The CRS will direct implementation of _(1)_ and the crew will start _(2)_.
• Unit 2 is at 100% Power.
• 21 Auxiliary Feedwater Pump is cleared and tagged for motor replacement.
• 22 CFCU is cleared and tagged for bearing replacement.
• A Large Break LOCA occurs concurrently with a Loss of Off-Site Power.
• The crew is currently implementing step 17, "CCW Pump Operation Evaluation", in accordance with 2-EOP-TRIP-1, Reactor Trip or Safety Injection.
Complete the following statement concerning component cooling water (CCW) system operation based on the above conditions:
The CRS will direct implementation of _(1)_ and the crew will start _(2)_.
A. _(1)_ 2-EOP-APPX-1, Component Cooling Water Restoration
_(2)_ 22 CCW Pump
_(2)_ 22 CCW Pump
B. _(1)_ 2-EOP-APPX-1, Component Cooling Water Restoration
_(2)_ 21 CCW Pump
_(2)_ 21 CCW Pump
C. _(1)_ S2.OP-SO.CC-0001, Component Cooling System Operation
_(2)_ 22 CCW Pump
_(2)_ 22 CCW Pump
D. _(1)_ S2.OP-SO.CC-0001, Component Cooling System Operation
_(2)_ 21 CCW Pump
_(2)_ 21 CCW Pump
▶ Show Answer & Explanation
✓ B. Correct. IAW with the APPX-1 Basis, 21 AFW Pump unavailability provides adequate margin on the 2A EDG, therefore 21 CCW Pump is started (step 2 of APPX-1). Both CCW HXs are placed in service because at least three SW Pumps are running. During MODE III (Blackout & Accident) the primary or lead SW Pump will start & load on each EDG.
✗ A. The first part is correct because EOP-TRIP-1 directs implementation of EOP-APPX-1 to start one CCW Pump. The second part is plausible because the candidate may believe that 22 CFCU unavailability provides adequate margin on the 2B EDG to allow the starting of 22 CCW Pump. Placing both HXs in service is also correct.
✗ C. The first part is plausible because the candidate may remember that EOP-TRIP-1 directs implementation of S2.OP-SO.CC-0002(Q), 21 and 22 Component Cooling HX Operation. Incorrect as this transition is only if two or more CCW pumps are in service and the HXs are not in Auto. During MODE III SEC loading, no CCW pumps are running. The second part is plausible because if the 21 AFW Pump was not cleared and tagged, various redundant ventilation 460V loads would be swapped for starting the 22 CCW Pump. The candidate may also believe that 22 CFCU unavailability provides adequate margin on the 2B EDG to allow the starting of 22 CCW Pump. The last part is incorrect because both CCW HXs would be placed I/S. Plausible because with only one CCW Pump running, the candidate may believe that only one CCW HX is placed I/S.
✗ D. The first part is plausible because the candidate may remember that EOP-TRIP-1 directs implementation of S2.OP-SO.CC-0002(Q), 21 and 22 Component Cooling HX Operation. Incorrect as this transition is only if two or more CCW pumps are in service and the HXs are not in Auto. During MODE III SEC loading, no CCW pumps are running. The second part is correct. The last part is plausible because the candidate may believe with only one CCW Pump running, only one CCW HX is placed I/S. Incorrect as both HXs are placed I/S.
Ref: 2-EOP-APPX-1, Component Cooling Water Restoration | LO: N/A | Source: New | Cognitive: Comprehension | SRO-Only: Requires knowledge of content & basis of EOP Appendix for CCW Restoration
Connections
- Related systems: CCW, AFW, ECCS, Service Water
- Related EOPs: EOP-TRIP-1 — Reactor Trip or Safety Injection, EOP-APPX-1 — Component Cooling Water Restoration
- Related exam: 2020 NRC Written Exam