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EOPs > EOP-TRIP-2 — Reactor Trip Response

EOP-TRIP-2 — Reactor Trip Response

⚠️ DRAFT

EOP-TRIP-2 — Reactor Trip Response

Purpose

Provides post-trip response actions following a reactor trip without safety injection, including emergency boration procedures.

Key Actions / Information

Exam — 2023 Q19
Step 4 — rapid boration via BAT pump and CV175. Adequate flow is 36 gpm. If flow is inadequate, stop BAT pump and realign charging suction to RWST.
Exam — 2020 Q21
Control Rod Insertion step — if 2CV175 (RAPID BORATE STOP VALVE) fails to open, EOP-TRIP-2 directs: OPEN RWST to CHARGING SUCTION VALVES 2SJ1 and 2SJ2, then CLOSE VCT to CHARGING SUCTION VALVES 2CV40 and 2CV41 to establish rapid boration from the RWST. Alternate paths via 2CV174 (Blender Bypass), 2CV172/2CV185 (normal boration), or 2CV172/2CV181 (blender to VCT) are in S2.OP-SO.CVC-0008 (Rapid Boration) but are NOT directed in TRIP-2.
JPM — 2022 RO-A2
Step 4 — Control Rod Insertion boration: for stuck control rods, rapid boration time = 35 minutes per stuck rod. Three stuck rods from Control Bank Delta = 35 x 3 = 105 minutes total rapid boration at 40 GPM. Total volume injected = 105 min x 40 GPM = 4200 gallons. Use S2.OP-TM.ZZ-0002 tank capacity curves to convert BAST levels between percent and gallons for determining final tank levels.
JPM — 2022 SRO-A2
Step 4 boration for 3 stuck Control Bank Delta rods: 35 min x 3 = 105 minutes at 40 GPM = 4200 gallons total. Both BASTs start at 70% (5500 gal each). Each lowers by 2100 gal to 3400 gal = 43% per tank. Post-boration TS evaluation: with RWST at 2350 ppm and BAST at 6650 ppm, TS 3.1.2.6 Figure 3.1-2 requires > 96.5% combined BAST level. At 86% combined (43% + 43%), LCO 3.1.2.6.a.1 is NOT met — restore within 72 hours or Hot Standby in 6 hours.
Exam — 2020 Q11
Step 15 directs selectively energizing PZR backup heaters from the vital bus during a LOOP. Per S2.OP-SO.PZR-0010, aligning PZR heaters adds approximately 210 KW to bus load and the maximum DG load at the 2000 hr rating is 2750 KW.
Scenario — 2020 #4
Transitioned from EOP-TRIP-1 following reactor trip on 23 RCP high vibration (no SI required). During EOP-TRIP-2, 21 SG tube rupture develops (650 gpm). Crew identifies SGTR based on 21 SG NR levels rising and 2R15 condenser off-gas rad monitor in alarm. CRS enters AB.SG-0001, implements CAS — manually initiates SI, returns to EOP-TRIP-1.
Scenario — 2018 #1
Transitioned from EOP-TRIP-1 following reactor trip on 22 RCP seal failure (no SI required). Shortly after entering TRIP-2, 24 SG tube rupture (650 gpm) occurs. Crew identifies tube rupture based on SG NR levels rising, radiation monitors 2R53D, 2R15, 2R41, 2R19D in alarm. CRS directs manual SI initiation and returns to EOP-TRIP-1.

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