EOP-FRCE-2 — Response to Containment Flooding
Purpose
Provides operator actions for responding to containment flooding conditions, including identification and isolation of water sources into containment.
Key Actions / Information
Exam — 2023 Q24
Service Water from CFCUs is NOT isolated by Phase A or Phase B containment isolation. Following both Phase A and Phase B actuations, SW is the only remaining source of water into containment. Fire Protection is isolated on Phase A, CCW is isolated on Phase B, and Potable Water is isolated on Phase A.
Exam — 2019 Q75
FRCE-2 entry condition: Containment Sump level ~78% (75% ADVERSE). FRCE-2 is the containment flooding functional restoration procedure, entered from EOP-CFST-1 when the containment sump level threshold is exceeded. FRCE-2 is NOT entered on containment pressure or radiation — those conditions trigger FRCE-1 (Red or Purple) and FRCE-3 (Yellow) respectively.
Exam — 2018 Q74
Step 1 — CFCU SW isolation for leaking CFCU: close BOTH the SW Inlet valve (SW58) AND the SW Outlet valve (SW72). When a CFCU is stopped, 25SW223 automatically closes (directly downstream of SW72), but FRCE-2 still requires closing both SW58 and SW72 manually. Trap: 25SW223 auto-closure could lead a candidate to conclude only the inlet valve (SW58) needs to be closed. Both inlet AND outlet must be closed per FRCE-2. Entry threshold (normal containment): 78% sump level; adverse containment threshold: 75%.
Connections
- Related systems: Service Water, CFCUs, Containment
- Related EOPs: EOP-CFST-1 — Critical Safety Function Status Trees
- Related exam questions: 2018 Q74, 2019 Q75, 2023 Q24
- Related exam: 2018 NRC Written Exam, 2019 NRC Written Exam, 2023 NRC Written Exam