SALEM
SALEM STUDY SYSTEM
Abnormals > AB.RHR-0001 — Loss of RHR

AB.RHR-0001 — Loss of RHR

⚠️ DRAFT

AB.RHR-0001 — Loss of RHR

Purpose

Provides guidance for response to a loss of Residual Heat Removal while in shutdown cooling.

Key Actions / Information

Exam — 2023 Q79
Per OP-SA-108-106-1001 (Equipment Control and Large Motor Starting Criteria) step 4.2.2: during an emergency condition (as determined by SM/CRS), if a breaker fails to close, the Shift Manager can authorize one attempt at reclosure without an investigation if that piece of equipment is essential for maintaining plant stability. No STA concurrence or Plant Manager authorization is required. This applies to 4KV breakers for safety-related pumps such as RHR pumps.
Exam — 2019 Q78
AB.RHR-0001 CAS procedure transitions based on MODE and inventory status: in MODE 4 with RCS inventory loss (PZR level lowering, containment particulate monitor rising), the CAS directs the crew to IMMEDIATELY GO TO AB.LOCA-0001 (Shutdown LOCA). Trap: Attachment 9 (SG Reflux Cooling) applies when all vital buses are lost. AB.RHR-0002 (Loss of RHR at Reduced Inventory) applies when RCS is aligned for operation <101 ft elevation. Continuing in AB.RHR-0001 main body (start SI/Charging, control PZR level 5-50%) applies in MODE 5 or 6.
Exam — 2020 Q6
AB.RHR-0001 in Mode 4 directs per CAS to AB.LOCA-0001 (Shutdown LOCA) for an uncontrolled reduction in PZR level. AB.RHR-0001 actions (isolate letdown, start SI and charging pumps, maintain PZR level 5-50%) apply to Modes 5 or 6 affecting RHR — NOT Mode 4.
JPM — 2020 Sim-b
Mode 5 with RCS depressurized/vented: 21 RHR Pump trips on electrical fault, 22 RHR Pump trips shortly after starting (alternate path). Procedure path: 3.3 No (not reduced inventory) → 3.5 Yes (mechanical/electrical failure) → 3.50 Yes (heat sink available) → 3.51 Yes → 3.52 Attachment 3 (22 RHR trips) → re-enter → 3.7-3.25 (no RHR running) → 3.30-3.32 → Attachment 8, Cold Leg Injection (core exit TCs <200°F). Key valve lineup: open 2SJ1/2SJ2 (RWST to charging), close 2CV40/2CV41 (VCT to charging), open 2SJ4/2SJ5 and 2SJ12/2SJ13 (BIT), close 2CV68/2CV69 (charging discharge). Also isolates: stop RHR L/D Booster Pump, close 2CV8.
Exam — 2019 Q86
Heatup rate during loss of RHR: per AB.RHR-0001 Attachment 5 (Heatup Rate for Loss of RHR Cooling), 2 days after shutdown (before offload) at 10% PZR Level, heatup rate is 5 °F per minute. With TAVG at 150 °F, time to reach 200 °F (MODE 4) = (200 - 150) / 5 = 10 minutes. EAL#CA4.1 criteria for ALERT with RCS intact: RCS must be > 200 °F for 60 minutes. Earliest ALERT at 0810 (0700 + 10 min heatup + 60 min duration). Trap: using the wrong heatup curve (after offload = 3.4 °F/min) gives incorrect time to 200 °F. Must use before offload curve since the plant has only entered MODE 3 for a planned outage — no fuel has been offloaded.
Exam — 2018 Q87
AB.RHR-0001 CAS for loss of RCS inventory in MODE 5: "IF AT ANY TIME a loss of RCS inventory occurs, THEN PERFORM one of the following: IF in Mode 5 OR 6, THEN START Safety Injection and Charging Pumps as required AND CONTROL Pressurizer level between 5% and 50% while maintaining RHR System in service." Key CAS routing based on MODE:
- Mode 4 with inventory loss → AB.LOCA-0001 (Shutdown LOCA)
- Mode 5 or 6 with inventory loss → Start SI/Charging, control PZR level 5-50%
- Complete loss of all vital buses (not BDBE) → Attachment 9 (SG Reflux Cooling)
- RCS aligned for operation < 101 ft elevation → AB.RHR-0002

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