AOP-9 "Loss of Bus 1D"

Question 1

AOP-9 entry conditions

Answer 1

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

• EK-0515 “2400V Bus 1C and/or 1D HI/LO Voltage Undervoltage” (<2375 V, 18 sec time delay)
• EK-0522 “Bus Fail to Transfer”
• EK-0521 “2400V Standby Power Not Available”
• EK-0510 “2400V Bus 1D Bkr 152-202 Trip” (if closed)
• EK-0504 “2400V Bus 1D Bkr 152-203 Trip” (if closed)
• EK-0532 “Bus 1C or 1D Overcurrent Lockout”

Question 2

AOP-9 automatic actions

Answer 2

Emergency Diesel Generator 1-2 starts

Question 3

AOP-8 equipment trip criteria

Answer 3

Trip Emergency Diesel Generator 1-2 using the overspeed trip if:

• Jacket water temperature > 195 F
• Lube oil temperature > 200 F

Question 4

AOP-9 immediate actions

Answer 4

NONE