Reactor Power Cutback

Question 1

Unit 3 is at 100% power with all systems in a normal lineup.
A ground develops on NNN-D12 and it de-energizes.
One minute later, the ‘A’ Main Feed Pump trips on overspeed.
What is the expected plant response?
A. The main turbine will setback to 60%. Regulating Groups 4 and 5 will drop.
B. The main turbine will runback to around 55%.
Regulating Groups 4 and 5 will drop.
C. The main turbine will setback to 60%. Regulating Group 5 will start inserting in AUTO SEQUENTIAL.
D. The main turbine will runback to around 55%. Regulating Group 5 will start inserting in AUTO SEQUENTIAL.

Answer 1

A

Question 2

Unit 3 is at 100% power with all systems in a normal lineup.
A ground develops on NNN-D11 and it de-energizes.
One minute later, the ‘A’ Main Feed Pump trips on overspeed.
What is the expected plant response?
A. The main turbine will setback to 60%. Regulating Groups 4 and 5 will drop.
B. The main turbine will runback to around 55%.
Regulating Groups 4 and 5 will drop.
C. The reactor will trip on low steam generator level
D. The reactor will trip on high pressurizer pressure.

Answer 2

C

Question 3

Unit 1 is at 100% power with all systems in a normal lineup.
The RO inadvertently depresses the TEST/RESET pushbutton while attempting to perform a lamp test on the RPCB module.
Realizing the mistake, the RO depresses the TEST/RESET pushbutton again to clear the light.
One minute later, the ‘A’ Main Feed Pump trips on overspeed.
What is the expected plant response?
A. The main turbine will setback ONLY. Regulating Groups 4 and 5 will drop.
B. The main turbine will setback and runback.
Regulating Groups 4 and 5 will drop.
C. The main turbine will setback ONLY. Regulating Group 5 will start inserting in AUTO SEQUENTIAL.
D. The main turbine will setback and runback. Regulating Group 5 will start inserting in AUTO SEQUENTIAL.

Answer 3

D