AOP-6 "Loss of Condenser Vacuum"

Question 1

AOP-6 entry conditions

Answer 1

• EK-0111 “Vacuum Lo” (24” Hg)
• EK-0110 “Vacuum Pretrip” (21.5” Hg)
• EK-3522 “Clg Twr Pump P-39A Trip”
• EK-3523 “Clg Twr Pump P-39B Trip”
• PT-0763, Turbine Backpressure (6” Hg)

Question 2

AOP-6 automatic actions

Answer 2

Turbine trips at 18-21” Hg condenser vacuum

Question 3

AOP-6 reactor trip criteria

Answer 3

Reactor power > 15%

• Condenser vacuum lowers to less than 22” Hg
• Loss of both cooling tower pumps

Question 4

AOP-6 turbine trip criteria

Answer 4

Reactor power < 15%

• Condenser vacuum lowers to less than 22” Hg
• Loss of both cooling tower pumps

Question 5

AOP-6 immediate actions

Answer 5

NONE