AOP-10 "Loss of Bus 1E"

Question 1

AOP-10 entry conditions

Answer 1

Symptoms of loss of Bus 1E (loss of power to all Bus 1E powered components) in conjunction with 1 or more of the following:

• EK-0517 “2400V Bus 1E Undervoltage” (90V secondary or 1860V primary)
• EK-0522 “Bus Fail to Transfer”
• EK-0521 “2400V Standby Power Not Available” (85V secondary or 1700V primary)
• EK-0505 “2400V Bus 1E Bkr 152-302 Trip” (if closed)
• EK-0511 “2400V Bus 1E Bkr 152-303 Trip” (if closed)

Question 2

AOP-10 automatic actions

Answer 2

DEH Controller Power Supply switches to battery backup

Question 3

AOP-10 reactor trip criteria

Answer 3

Loss of Heater Drain Pump(s) results in Main Feedwater Pump(s) trip

Question 4

AOP-10 immediate actions

Answer 4

If loss of Heater Drain Pump(s) cause the Main Feedwater Pump(s) to trip, then trip the reactor