EOP-FRCE-1 — Response to Excessive Containment Pressure
Reconstructed from exam materials
Purpose
Functional restoration procedure for responding to excessive containment pressure by maximizing containment heat removal systems (containment spray and CFCUs).
Key Actions / Information
Exam — 2022 Q80
Step C3-1 Caution: If LOCA-5 is in effect, operation of containment spray pumps should be IAW LOCA-5 (not FRCE-1). LOCA-5 has less restrictive criteria that allow reducing the number of operating containment spray pumps based on RWST level and CFCUs to conserve RWST inventory. FRCE-1 would establish maximum available heat removal (more spray pumps), which conflicts with LOCA-5's priority to conserve RWST inventory. The CRS can transition to FRCE-1 from LOCA-5, but CS pump operation follows LOCA-5 guidance.
Exam — 2018 Q73
Step 2 — CS pump operation with LOCA-5 in effect: when transitioning to FRCE-1 from LOCA-5, CS pumps are operated as directed by LOCA-5. If LOCA-5 directed both CS pumps stopped, the crew will NOT start both CS pumps in FRCE-1 even though containment pressure exceeds 15 psig. Conserving RWST water IS a reason for how CS pumps are operated in FRCE-1 Step 3 when LOCA-5 is in effect. Normally FRCE-1 would start both CS pumps when containment pressure exceeds 15 psig. The LOCA-5 provision overrides this to conserve RWST inventory.
Connections
- Related systems: Containment Spray, CFCUs, Containment
- Related EOPs: EOP-LOCA-5 — Loss of Emergency Coolant Recirculation
- Related exam questions: 2018 Q73, 2020 Q9, 2022 Q80
- Related exam: 2018 NRC Written Exam, 2020 NRC Written Exam, 2022 NRC Written Exam