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21 Cards in this Set
- Front
- Back
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1. What is the function of the Emergency Diesel Generator?
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1. The Emergency Diesel Generator provides a backup source of power to those loads necessary to shutdown the plant and loads necessary to mitigate the consequences of an accident.
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2. What signals will trip the EDG output breaker following a normal start?
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2. Reverse power, overcurrent, loss of field, neutral ground overcurrent, differential overcurrent, under frequency, and volts/hertz relay.
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3. When can the Emergency Diesel Generator output breaker be closed locally, using the handle on the outside of the breaker cubicle?
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3. Only when the breaker is in the TEST position.
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4. Which of the following loads is NOT started by the Shutdown Sequencer? A. Essential Service Water Pump B. Centrifugal Charging Pump C. Safety Injection Pump D. Motor Driven Auxiliary Feedwater Pump
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4. C. Safety Injection Pump.
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5. Why is the Loss of Coolant Accident (LOCA) sequencer prevented from starting if an undervoltage condition exists on the safeguards bus?
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5. To allow the diesel generator to start, obtain rated voltage and speed, and shut its output breaker. This prevents overload of the EDG due to high starting current from several large motors occurring simultaneously.
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6. What immediate Technical Specification action is required that if one load shedder and emergency load sequencer becomes inoperable?
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6. The affected DG and offsite circuit must be declared inoperable.
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7. Why is it important to ensure that the EDG exciter field flash circuitry resets following maintenance or testing of the EDG?
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7. If it is not reset and an emergency start signal is initiated, the EDG would not produce output voltage and would be unable to provide emergency power for the NB bus.
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1. What is the function of the Emergency Diesel Engines?
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ANSWER They provide emergency AC electrical power to equipment necessary for the safe shutdown of the plant or for the mitigation of an on-site accident.
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2. What is the function of the fuel oil transfer subsystem?
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Answer: The function of the emergency diesel fuel oil subsystem is to provide onsite fuel oil storage and transfer of fuel oil to the emergency diesel engines.
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3. What is the function of the lube oil subsystem?
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Answer: The emergency diesel engine lubrication subsystem (EDELS) provides essential lubrication and cooling for the components of the emergency diesel engine.
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4. What is the function of the jacketwater and intercooler cooling water subsystems?
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Answer: To remove heat from the diesel engines to permit their operation at continuous nameplate rating.
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5. What is the function of the starting air subsystem?
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Answer: To allow the diesel to be started without any major external power source.
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6. What is the function of the exhaust, intake, and crankcase ejector subsystems?
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Answer: To provide combustion air the diesel engine, remove exhaust gasses, and provide crankcase ventilation to prevent buildup of explosive gasses in the crankcase.
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7. What is the function of the EDG governor?
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Answer: To control the EDG speed (and load when breaker is closed) during startup, full speed operation and shutdown activities.
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8. What signals will start the Emergency Diesel Engine?
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Answer: * Receipt of a Safety Injection Signal (SIS). * Loss of voltage to the respective 4.16-KV Class 1E bus to which each generator is connected. * Manual -- Remote switch actuation (Main Control Room) * Manual -- Local switch actuation (Diesel Generator Room) * Emergency Manual -- Local switch actuation by breaking the glass (Diesel Generator Room) * Manual override lever on the Air Start Control Valve (Diesel Generator Room).
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9. What would eventually trip the EDG if ESW flow to the EDG coolers was stopped due to a mis-aligned valve?
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Answer: High jacket water temperature.
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10. If the EDG can't be stopped with the CR stop or local stop pushbutton, what other method can be used to stop the engine?
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Answer: Emergency Stop Lever or close a fuel supply valve
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11. What are the EDG engine trips?
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Answer: Overspeed, low lube oil pressure, high jacket water temperature, high crankcase pressure, lock out relay (differential/ground overcurrent), manual (CR), manual local.
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12. In what Modes do T.S. 3.8.1 apply?
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Answer: Modes 1-4.
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13. What can cause the oil level in the governor to increase?
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Answer: Water leakage in the oil cooler
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14. What is the correct direction of rotation of the EDG petcocks to close?
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Answer: clockwise
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