AOP-17, Loss of 125v DC Panels

Question 1

What buses does AOP-17, Loss of 125v DC Buses cover?

Answer 1

D-11A

D-11-1

D-11-2

D-21A

D-21-1

D-21-2

Question 2

What are the entry conditions of AOP-17, Loss of 125v DC Panels?

Answer 2

D-11A

• P-8A, Motor Driven Auxiliary Feedwater Pump, Bkr Indication
• Bus 1C Control Power Available indication

D-11-1

• P-8A, Motor Driven Auxiliary Feedwater Pump, Bkr Indication
• Bus 1C Control Power Available indication

D-11-2

• K-7A, Feedwater Pump P-1A Turbine Driver, Trip Power
• CV-0847, SW Supply to Containment, position indication

D-21A

• P-8C, Motor Driven Auxiliary Feedwater Pump, Bkr indication
• Bus 1D Control Power Available

D-21-1

• CV-0501, S/G E-50B MSIV, position indication
• Bus 1B Control Power Available indication
• Bus 1E Control Power Available indication

D-21-2

• K-7B, Feedwater Pump P-1B Turbine Driver, Trip Power indication
• CV-1359, Non-Critical SW Header Isol, position indication
• EK-0542, “ANNUNCIATOR DC FAILURE”

Question 3

What happens on the loss of D-10R?

Answer 3

Deenergizing Bus ED-10R results in the loss of EY-10, Preferred AC Bus No 1,
and the following actions will occur:

• P-8A/P-8B AFW control circuitry transfers to EY-30 power.
• Main Feedwater control for ‘A’ S/G transfers to EY-30 power.
• P-8B, Steam Driven Auxiliary Feedwater Pump, starts.

Question 4

What happens on the loss of D-20R?

Answer 4

Deenergizing Bus ED-20R results in the loss of EY-20, Preferred AC Bus No 2,
and the Main Feedwater control for ‘B’ S/G transferring to EY-40 power.

Question 5

What happens on the loss of D-11-1?

Answer 5

Deenergizing Panel ED11-1 results in P-8B, Steam Driven Auxiliary Feedwater
Pump, starting.