AOP-18 "Loss of Left Train DC Power"

Question 1

AOP-18 entry conditions

Answer 1

-EK-0548 “125V DC Bus Undervoltage”

AND

-EK-0541 “Battery Chargers Trouble”

AND

-EK-0543 “Preferred AC Bus No 1 Trouble”

AND

-EK-0544 “Preferred AC Bus No 3 Trouble”

Question 2

AOP-18 automatic actions

Answer 2

P-8B, Steam Driven Aux Feed Pump, starts

Question 3

AOP-18 reactor trip criteria

Answer 3

NONE

Question 4

AOP-18 immediate actions

Answer 4

1. Verify the reactor tripped, if reset (if not, trip the reactor, if reset)
2. Verify the turbine tripped (if not, trip the turbine using PB20AST, HS-0501A, Main Steam from S/G B to close, or manually at the turbine front standard)
3. Trip 25F7 and 25H9, Main Generator Output breakers using the jumper