Q80 — EOP-LOCA-5 Containment Spray / FRCE-1
W E11 EA2.1 (4.2)
Given:
• A LOCA has occurred on Unit 2.
• The crew is performing 2-EOP-LOCA-5, Loss of Emergency Recirculation.
• Containment pressure is now 15.1 psig and rising.
Based on the above condition, which ONE of the following describes how the CRS should direct the operation of the Containment Spray Pumps and why?
The Containment Spray Pumps are operated as directed in...
Note: 2-EOP-FRCE-1 - Response to Excessive Containment Pressure
FRPs - Functional Restoration Procedures
• A LOCA has occurred on Unit 2.
• The crew is performing 2-EOP-LOCA-5, Loss of Emergency Recirculation.
• Containment pressure is now 15.1 psig and rising.
Based on the above condition, which ONE of the following describes how the CRS should direct the operation of the Containment Spray Pumps and why?
The Containment Spray Pumps are operated as directed in...
Note: 2-EOP-FRCE-1 - Response to Excessive Containment Pressure
FRPs - Functional Restoration Procedures
A. 2-EOP-LOCA-5 since FRPs are NOT implemented during performance of LOCA-5.
B. 2-EOP-LOCA-5 because it establishes minimum required Containment Spray flow to conserve RWST inventory.
C. 2-EOP-FRCE-1 because restoration of the critical safety function takes precedence.
D. 2-EOP-FRCE-1 because it uses the same criteria for operating containment spray pumps as LOCA-5.
▶ Show Answer & Explanation
✓ B. Correct. IAW 2-EOP-FRCE, step C3-1 Caution, if LOCA-5 is in effect, then operation of containment spray pumps should be IAW LOCA-5. LOCA-5 has less restrictive criteria which allows for reducing the number of operating containment spray pumps based on RWST level and CFCUs. The CRS can transition to EOP-FRCE-1, but will follow the direction from LOCA-5 when it comes to the operation of CS pumps.
✗ A. Incorrect. Transition to FRPs are allowed in EOP-LOCA-5. Plausible in that EOP-LOCA-3 does not allow transition to FRPs during the transfer to cold leg recirculation.
✗ C. Incorrect. Plausible because the CRS can transition to EOP-FRCE-1.
✗ D. Incorrect. Plausible because the CRS can transition to EOP-FRCE-1. EOP-FRCE-1 will establish maximum available heat removal system operation to reduce containment pressure which is in contradiction to LOCA-5 priority to conserve RWST inventory. IAW 2-EOP-FRCE, step C3-1 Caution, if LOCA-5 is in effect, then operation of containment spray pumps should be IAW LOCA-5.
Ref: 2-EOP-LOCA-5 (R40) | LO: NOS05LOCA05-05, Objective 6 | Source: Bank - Salem | Cognitive: Comprehension/Analysis
Connections
- Related systems: Containment Spray, CFCUs
- Related EOPs: EOP-LOCA-5 — Loss of Emergency Coolant Recirculation, EOP-FRCE-1 — Response to Excessive Containment Pressure
- Related exam: 2022 NRC Written Exam