Diesel Generator Flashcards
Emergency Diesel Generator ‘A’ has started in response to a SIAS.
Turbo Charger Oil Pressure is 25 psig.
The Diesel Generator should be:
A. running in Emergency Mode due to the SIAS.
B. running in Emergency Mode with Turbo Charger Lube Oil Filter internal bypass fully open.
C. shutdown due to a Low Lube Oil Pressure to Turbo Charger (setpoint 27 psig).
D. running but the Turbo Charger is shutdown due to a low oil pressure trip.
A. running in Emergency Mode due to the SIAS.
Which of the following describes the bases for the required level in the Diesel Fuel Oil storage tank?
To provide…
A. 4 days of required loads following a LOCA
B. 7 days of full load operations.
C. At least 26 days of required loads following a LOCA
D. 4 days of full load operation followed by 10 days of one train of shutdown cooling loads.
B. 7 days of full load operations.
A loss of offsite power.
Both diesel generators started and carried the loads on their respective PB busses.
The ‘A’ DG received a ‘HIGH PRIORITY TROUBLE’ on High Cranckcase Pressure alarm.
The ‘B’ DG received a ‘LOW PRIORITY TROUBLE’ alarm on Jacket Water Temperature (200 F) off normal.
Both DGs continued to run.
What will happen when the ‘Start/Stop’ control switches on B01 are operated after offsite power has been restored to the class busses?
A. After taking the control switches to start, and then stop, the ‘A’ DG will immediately stop, but the ‘B’ DG will continue to run for 5 minutes.
B. When the control switches are taken to start, then stop, both DGs will continue to run for 5 minutes.
C. When the Control Switches are taken to start, the ‘B’ DG will immediately stop, but the ‘A’ DG will continue to run for 5 minutes.
D. When the control switches are taken to start, then stop, both DGs will immediately stop.
A. After taking the control switches to start, and then stop, the ‘A’ DG will immediately stop, but the ‘B’ DG will continue to run for 5 minutes.
Unit has tripped from 100% power.
A loss of the grid has occurred 3 minutes ago.
Both DGs have started and energized their respective buses.
The operator adjusts the ‘A’ DG speed control hand switch in the raise direction for a few seconds and then takes his hand off the switch.
Based on these conditions, the ‘A’ DG speed will…
A. Increases as the hand switch is manipulated.
B. Not change as the hand switch is manipulated nor when the DG is taken to override.
C. Not increase now but will increase when the DG is taken to override.
D. Increase as the hand switch is manipulated and will increase an equal amount when the DG is taken to override.
C. Not increase now but will increase when the DG is taken to override.
Unit is operating at rated power.
Diesel Generator B monthly surveillance test is in progress.
Diesel Generator B is connected to PBB-S04.
An inadvertent CSAS occurs on B Train.
Assuming no operator action, three minutes later you should expect Diesel Generator B and PBB-S04 status to be DG ‘B’ sunning…
A. In emergency mode, connected to the PBB-S04 bus.
B. In test mode, connected to the PBB-S04 bus.
C. In test mode, not connected to the PBB-S04 bus.
D. In emergency mode, not connected to the PBB-S04 bus.
B. In test mode, connected to the PBB-S04 bus.
PBB-S04 is being powered from DG ‘B’ power following a LOP
Normal and alternate supply breakers to PBB-S04 are open.
What is the effect of going to override on the DG hand switch?
A. This has the same effect as taking the emergency mode defeat switch to ON.
B. This allows stopping the DG from the control room, but does not affect any other control circuit.
C. Speed control, voltage control and test run trips are restored.
D. Speed control, voltage control and DG breaker electrical trips are restored.
D. Speed control, voltage control and DG breaker electrical trips are restored.
Unit 2 is operating at rated power.
The A D/G output breaker is closed with the D/G carrying 5000 KW of load paralleled to offsite power.
A loss of PKA-M41 occurs due to a bus fault.
Which one of the following describes the impact, if any, this has the D/G?
A. No impact, since PNA-D25 remains energized.
B. The D/G trips but its output breaker remains closed, causing the diesel to motorized.
C. The D/G trips, its output breaker remains closed and PBA-S03 de-energizes.
D. The D/G continues to run at 5000 KW, however output breaker control has been lost.
B. The D/G trips but its output breaker remains closed, causing the diesel to motorized.
The Diesel Generator is running in Emergency Mode after a loss of power (LOP). What trips are enabled to protect the Diesel Generator?
A. Excess engine vibration, low lube oil pressure, over speed.
B. Low lube oil pressure, overspeed, generator differential.
C. Overspeed, reverse power, turbocharger low lube oil pressure.
D. Main bearing high temperature, turbocharger bearing failure, generator differential.
B. Low lube oil pressure, overspeed, generator differential.
Unit 3 is operating at rated power.
A LOCA results in a plant trip with a SIAS/CIAS.
The Train ‘B’ BOP-ESFAS Load sequencer fails.
Startup Transformer #1 (NAN-X01) faults during the transient.
Assuming no operator action, three minutes later you should expect PBB-S04 to be…
A. De-energized, D/G ‘B’ never received a start signal.
B. Energized by officiate power, D/G ‘B’ running unloaded.
C. De-energized with D/G ‘B’ running unloaded.
D. Energized by offsite power, Diesel Generator ‘B’ running unloaded.
C. De-energized with D/G ‘B’ running unloaded.
The Diesel Generator is running unloaded in TEST MODE during surveillance testing. The operator takes the control room hand switch to stop. It takes 2.5 minutes for the Diesel Generator to stop. What conditions may be indicated?
A. Low Priority Trouble Trip
B. Both Emergency Run Solenoids have failed.
C. One Emergency Run Solenoid has failed
D. Trip system integrity checks were satisfactory.
C. One Emergency Run Solenoid has failed
The Diesel Generator is being started during surveillance testing. The operator takes the control room hand switch to start. The hand switch goes dark after 5 seconds and is still dark after 15 seconds. What conditions may be indicated?
A. The Diesel Generator has tripped
B. Control Air has been lost
C. The Diesel Generator is now in Emergency Mode
D. The Diesel generator speed is less than 540 rpm during a slow start
D. The Diesel generator speed is less than 540 rpm during a slow start
Which of the following actuation signals will result in an automatic stop of DG ‘A’?
A. AFAS-2
B. Emergency Manual stop pushbutton locally
C. Manual isolation of the air receivers
D. Automatic Overspeed Trip
D. Automatic Overspeed Trip
Which of the following actuation signals will result in an automatic start of DG ‘A’?
A. AFAS-2
B. MSIS
C. FBEVAS
D. CREFAS
A. AFAS-2
LCO 3.8.3 ‘Diesel Fuel Oil, Lube Oil, and Started Air’ requires the capability to start in less than ____ seconds and operate for a period of ____ days.
A. 10, 10
B. 5, 3
C. 10, 7
D. 15, 7
C. 10, 7
