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procedures > S2.OP-SO.CAN-0001 — Hydrogen Recombiner Operation

S2.OP-SO.CAN-0001 — Hydrogen Recombiner Operation

⚠️ DRAFT

S2.OP-SO.CAN-0001 — Hydrogen Recombiner Operation

⚠️ DRAFT — Reconstructed from exam materials

Purpose

Provides guidance for operating the Hydrogen Recombiner System, including power setting calculations and startup of recombiners when directed by EOP-LOCA-1.

Key Actions / Information

Exam — 2019 Q32
21 Hydrogen Recombiner Reference Power: 43.68 KW. 22 Hydrogen Recombiner Reference Power: 42.63 KW. With CURRENT containment pressure 4.0 psig and PRIOR-to-LOCA temperature 90°F, Cp = 1.21. Power setting = 43.68 x 1.21 = 52.85, rounded to 54 KW. Common errors: using CURRENT temperature (120°F) instead of PRIOR-to-LOCA temperature for Cp lookup; using wrong recombiner's reference power (42.63 vs 43.68).
Exam — 2022 Q60
Hydrogen recombiner power setting calculation: Power Setting = Cp (pressure correction factor) x Reference Power. Use the CURRENT containment pressure and the PRIOR-to-LOCA containment temperature to select Cp from Attachment 2. Round up to the next higher setting readable on the meter.
Exam — 2020 Q92
Per EOP-LOCA-1 Step 24, when hydrogen concentration is between 0.5% and 4.0%, only one hydrogen recombiner is started. The normal operating procedure (SO.CAN-0001) starts two recombiners when concentration is 2.0% and rising. The EOP-LOCA-1 guidance differs — it limits to only ONE recombiner below 4%. ≥ 4.0% requires consulting the TSC for additional recovery actions.
Exam — 2019 Q91
SRO question confirms: per EOP-LOCA-1 Step 24, when H2 concentration is 0.7% (greater than 0.5%), crew starts ONLY ONE hydrogen recombiner by performing SO.CAN-0001 CONCURRENTLY with EOP-LOCA-1. The procedure is performed concurrently — not as a standalone evolution.
Exam — 2018 Q77
Confirms EOP-LOCA-1 requirement: start ONLY one hydrogen recombiner when containment H2 > 0.5%. Two recombiners exist, but EOP-LOCA-1 limits to one below 4%.

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