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EOPs > EOP-FRHS-1 — Response to Loss of Secondary Heat Sink

EOP-FRHS-1 — Response to Loss of Secondary Heat Sink

⚠️ DRAFT

EOP-FRHS-1 — Response to Loss of Secondary Heat Sink

Purpose

Provides operator actions for responding to a loss of secondary heat sink, including controlled depressurization of the secondary side.

Key Actions / Information

Exam — 2023 Q18
If the depressurization rate is set too high, high steam flow coincident with Lo-Lo Tavg (P-12) actuates Main Steam Line Isolation (MSLI), which cannot be blocked. All MSIVs close and steam dumps become unavailable. Depressurization must continue via MS10 atmospheric dump valves.
JPM — 2023 Sim-d
Steps 11-14 Bleed and Feed: actuate both trains SI → verify charging and SI pump flow → open all PZR PORVs. If 2PR2 fails to open (Step 14), open reactor head vent valves 2RC40-2RC43 (key-locked on 2RP2 backpanel) as alternate bleed path.
JPM — 2018 Sim-d
Steps 21-25 Bleed and Feed: tripped at 90% due to elevated turbine vibrations (AB.TL-0001), loss of all MFW and AFW, RED Path Heat Sink CFST. Bleed and Feed criteria: 3 SG WR levels < 32%. CAUTION — Steps 24-29 must be performed quickly. Stop all RCPs (already per Step 7). Initiate SI on both trains. Verify charging and SI pump flow, BIT flow ~150-160 gpm. Open both PORV stop valves (2PR6, 2PR7). Open both PORVs in Manual — 2PR2 fails to open (alternate path). At 2RP2 backpanel, use four keys to open 2RC40-2RC43 reactor head vent valves.
JPM — 2019 Sim-d
Nearly identical to 2023 Sim-d. Steps 21-24 Bleed and Feed: CAUTION — Steps 24 thru 29 must be performed quickly and without interruption. Stop all RCPs (already stopped at Step 7). Initiate SI on both trains. Verify charging and SI pump flow, BIT flow established (~235 gpm), Table C valves open. Open both PZR PORV stop valves (2PR6, 2PR7). Open both PORVs in Manual — 2PR2 fails to open (alternate path). At 2RP2 backpanel, use four keys to open 2RC40 through 2RC43 reactor head vent valves. Bleed and Feed criteria: 3 SG wide range levels < 20%.
JPM — 2023 Sim-e
Steps 7.2-7.5 condensate pump feed: select one SG (22 or 24 preferred — 21 and 23 steamed LAST to preserve TD AFW pump steam supply). Isolate all MS lines except selected SG. Depressurize below 575 psig using steam dumps. Bypass Tavg Low-Low when reached. Establish condensate flow, verify WR level rising, then place steam dumps in auto.
Exam — 2018 Q64
Step 23.2 bleed and feed ECCS prerequisite: the crew CAN proceed to establish the RCS Bleed Path with only 1 Charging Pump AND 1 SI Pump running — the crew continues attempts to start additional pumps while establishing the bleed path. Step 24 bleed path: crew will open BOTH PORVs ONLY. Reactor Head Vents are NOT part of the standard bleed path — they are an alternate bleed path if a PORV fails to open. Also, the procedure does NOT require BOTH SI Pumps and BOTH Charging Pumps before proceeding — 1 of each is sufficient.
Exam — 2019 Q64
Step 23 bleed and feed prerequisite: the crew needs 1 Charging Pump AND 1 SI Pump running to proceed with establishing the RCS Bleed Path. With only 2 Charging Pumps and NO SI Pump, the crew can NOT proceed — must continue attempts to start SI pump. Step 24 bleed path: opening BOTH PORVs ONLY is an allowable RCS Bleed Path. Reactor Head Vents are NOT part of the standard bleed path in FRHS-1. The head vents are an alternate path if a PORV fails to open.
Exam — 2022 Q81
Step 6: Heat sink is established if feed flow is verified to at least one SG by either CETs lowering OR WR level rising in one SG. NR level in at least one SG does NOT need to be > 9% to declare heat sink established — maintain flow to restore NR level to > 9% (15% adverse) and return to procedure in effect (e.g., EOP-TRIP-2). Do not confuse: the 9% NR level is the MAINTAIN target, not the criterion for heat sink established or for returning to the base procedure.
Scenario — 2022 #3
Loss of all AFW flow during EOP-TRIP-1 (22 AFP trips on overcurrent, 23 AFP trips on overspeed, 21 AFP C/T). CFST Heat Sink Red Path triggers transition to EOP-FRHS-1. Both SGFPs tripped due to auto SI actuation following main turbine failure to trip. Condensate recovery: crew resets SI/Phase A/Phase B, opens CA330s, selects one SG for depressurization to < 575 psig using MS10 atmospheric dump valve. Dispatches operator to open BF40 or BF19 at 120 ft TGA, opens BF13 and CN48 SGFP bypass valves, closes CN32 SGFP suction valves. CT#2 (CT-43): Establish feed flow to one SG before bleed and feed is required — verified by SG WR level rising or CETs lowering.
Exam — 2018 Q71
SG feeding restrictions in FRHS-1 vs FRCC-2: EOP-FRHS-1 specifically FORBIDS feeding a FAULTED SG if an INTACT or RUPTURED SG is available. EOP-FRCC-2 does NOT have this restriction — FRCC-2 allows feeding a FAULTED SG when no INTACT SG is available. Do not confuse the FRHS-1 restriction with FRCC-2 guidance.
Exam — 2018 Q80
Entry conditions per EOP-CFST-1: ALL SG NR Levels < 15% AND Total Feedwater Flow to SGs < 22E04 LB/HR — BOTH conditions required (not just low NR levels alone). Step 19 — return to procedure in effect criteria (with Bleed and Feed NOT initiated and condensate aligned): crew returns when SG WR level starts to rise in the fed SG. Trap: Step 19 also uses ANY SG NR > 15% (adverse) as an alternate return criterion. But with condensate just aligned and WR level rising, the WR level criterion is met first. Do not confuse: 15% adverse NR level is an alternate return criterion, not the ONLY one.
Exam — 2020 Q10
Secondary heat sink restoration with CETs lowering and SG WR levels at 7%: feed flow to ONE SG between 1E04 and 5E04 lbm/hr (25-100 gpm plant-specific equivalent) to prevent thermal shocking SG tubes. Per bases: "With stable or decreasing RCS temperatures, the feedwater flow rate is limited to minimize the potential impact of excessive thermal stresses since a direct measure of the steam generator temperature is not available." If CETs are still RISING, the procedure requires feeding at maximum/desired rate (not limited). The flow limitation only applies when CETs are stable or lowering. The concern is SG tube thermal stress, NOT reactor vessel thermal shock. Remaining dry SGs may have their levels recovered at the direction of TSC.
Exam — 2020 Q18
Step 3: "IS RCS PRESSURE GREATER THAN ANY INTACT OR RUPTURED SG PRESSURE?" — If NO, return to procedure in effect. Per bases: for larger LOCA break sizes, the RCS depressurizes below intact SG pressures; SGs no longer function as a heat sink; core decay heat is removed by the RCS break flow. Secondary heat sink is not required. Step 3.1 (place RHR in service if T-Hots < 350F) is only performed if Step 3 answer is YES, not NO. Bleed and Feed is also not required — the LOCA itself provides the heat removal mechanism.
Scenario — 2020 #5
Entered from EOP-TRIP-1 when all AFW lost: no SG NR levels >9% (15% adverse), total AFW flow <22E4 lbm/hr. Bleed and feed criteria: 3 SG wide range levels <20% (25% adverse). Recovery via condensate: close all GB4s, close all SS94s, stop all RCPs. Select ONE SG for depressurization to <575 psig. Caution note: steam 21 and 23 SGs last to maximize 23 AFW pump steam supply availability. Depressurize using steam dumps (MS Pressure Control) or MS10s. Locally open selected SG BF40 or BF19 (120 ft TGA). Open BF13, open CN48s (SGFP bypass valves), close CN32s (SGFP suction valves). CT-43: establish condensate feed flow before bleed and feed is required. Condensate flow established when SG pressure ~600 psig. WR level rising confirms feed flow (took ~6 min in validation after condensate flow started at 5-6%).
Scenario — 2019 #4
Loss of all AFW following Main Turbine trip: 21 AFW pump C/T, 22 AFW pump lost with 2B 4KV Vital Bus, 23 AFW pump trips on overspeed shortly after manual start. Crew validates CFST RED path on Heat Sink (SG NR levels <9%, AFW flow <22E4 lbm/hr). In FRHS-1, crew performs Prompt SGFP Recovery using 22 SGFP IAW S2.OP-SO.CN-0007: reset SGFP trips, relatch 22 SGFP, raise speed to 3960-3980 rpm, verify DP >50 psid, feed SGs via BF19/BF40. CT-43: Establish main feedwater flow to SGs before bleed and feed is required. Scenario terminates when main feed flow established and SG WR levels rising.

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