S2.OP-AR.ZZ-0002 — Overhead Annunciators Window B
Purpose
Provides alarm response procedures for Unit 2 Overhead Annunciator Window B alarms, including DC bus voltage, service water header pressures, and other B-panel alarms.
Key Actions / Information
Exam — 2020 Q13
OHA B-2, "2A 125 VDC CNTRL BUS VOLT LO": On loss of 2A Vital 125 VDC Bus (0 VDC on 2RP9), the only affected equipment from the listed malfunctions is 2A EDG is NOT available for start. #1 SGFP Emergency Oil Pump and Main Turbine Emergency Oil Pump are powered from other DC bus segments (250 VDC or 28 VDC), not the 2A 125 VDC bus.
Connections
- Related systems: DC Power, EDGs
- Related exam questions: 2020 Q13
- Related exam: 2020 NRC Written Exam