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EOPs > EOP-FRCC-1 — Response to Inadequate Core Cooling

EOP-FRCC-1 — Response to Inadequate Core Cooling

⚠️ DRAFT

EOP-FRCC-1 — Response to Inadequate Core Cooling

Purpose

Provides operator actions to restore core cooling when core exit thermocouples (CETs) indicate inadequate core cooling conditions. This is a Critical Safety Function Restoration Procedure (CSFRP) for Core Cooling — Red path.

Entry Conditions

  • Entered from EOP-CFST-1 when Core Cooling CSF status tree indicates RED path (CETs > 1200 degrees F)

Key Actions

SG Depressurization (Step 11)

  • Depressurize intact SGs using steam dumps or MS10s at maximum rate while attempting to avoid a Main Steam Isolation
  • Purpose: reduce RCS pressure to allow accumulator injection

RCP Start for Temporary Core Cooling (Step 18)

  • If CETs remain above 1200 degrees F, determine how many RCPs can be started
  • SG NR level requirement depends on containment conditions:
    • Normal containment: >= 9% NR level
    • Adverse containment (>= 4 psig): >= 15% NR level
  • Start RCPs only in loops with SGs meeting the NR level requirement
Exam — 2022 Q24
Step 18, RCP START FOR TEMPORARY CORE COOLING: if CETs > 1200°F and at least one SG NR level > 9% (15% adverse containment), start one RCP at a time for idle loops with SG NR > 9%. Loop around step 18 until CETs < 1200°F. If NO SG has NR > 9%: reset Phase A, open both CA330s, open both PZR PORVs and Rx Head Vents to reduce RCS pressure.
Exam — 2023 Q84
In EOP-FRCC-1, SG depressurization is performed at maximum rate (not 100 degrees F/hr). For RCP start at step 18 under adverse containment (>= 4 psig), the required SG NR level is >= 15%. Trap: if you use normal containment NR level criteria (9%) instead of adverse (15%), you would incorrectly calculate three RCPs available instead of one.
Exam — 2020 Q24
Core Cooling Red Path validation (no RCPs running, subcooling < 0°F): five (5) hottest CETs > 700°F AND RVLIS Full Range ≤ 39%. RVLIS Upper Range is NOT applicable for core cooling status. Purple Path uses RVLIS Dynamic Range ≤ 44% (requires RCPs running). For CET-based inadequate core cooling (Red Path entry into FRCC-1), five CETs must be > 1200°F, not three.

Safeguards Valve Alignment (Step 3)

Exam — 2019 Q72
FRCC-1 Step 3 Safeguards Valve Alignment with SECs in Mode 1: the crew WILL attempt to open BOTH BIT inlet valves (1SJ4 AND 1SJ5) even if one is already open. FRCC-1 requires both valves open, not just one. 11SW122 (SW to 11 CC HX) is NOT required to be closed in SEC Mode 1 — 11SW122 closure is required when SECs are in MODE 3 (SI + Blackout), not Mode 1 (SI only).

Connections