S2.OP-SO.MS-0001 — Main Steam Warmup
Purpose
Provides guidance for performing Main, Reheat, and Turbine Bypass steam system warmup, including preparation and sequencing of valve operations to prevent water hammer.
Key Actions / Information
Exam — 2018 Q16
21-24MS7 (Main Steam Loop Drain Valves) are opened BEFORE 21-24MS167 (MSIVs) to prevent pressurized steam from forcing residual water in the piping to cause water hammer on downstream components. MSIVs are opened when there is less than a MAXIMUM of 50 psid across each valve. Trap: 15 psig is used for other MS Header pressure steps in this procedure, not the MSIV opening criterion.
Connections
- Related systems: Main Steam
- Related exam questions: 2018 Q16
- Related exam: 2018 NRC Written Exam