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Catawba Nuclear Station > 125VDC Essential Diesel Auxiliary Power System(EPQ) > Flashcards

125VDC Essential Diesel Auxiliary Power System(EPQ) Flashcards

1
Q

What is the purpose of the 125VDC Diesel Auxiliary Power System?

A

The 125VDC Diesel Auxiliary Power System provides power to the diesel generator auxiliary loads that are necessary during diesel generator operation and provides the control power required to allow the D/G to start and close its feeder breaker to the 4160VAC Essential bus.

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2
Q

What is the system designator for the 125VDC Diesel Auxiliary Power System?

A

EPQ

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3
Q

What is the purpose of the 125VDC Diesel Auxiliary Power System Battery?

A

The battery is an emergency source of DC power to the loads if the charger is lost.

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4
Q

What is the rating of the 125VDC Diesel Auxiliary Power System Battery?

A

The battery can supply the required loads for 2 hours without its battery charger.

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5
Q

What is the purpose of the 125VDC Diesel Auxiliary Power System Battery Charger?

A

The battery charger coverts 600VAC to 125VDC output and normally supplies the system loads.

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6
Q

What is the power supply for the 125VDC Diesel Auxiliary Power System Battery Charger?

A

EMXE and EMXF

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7
Q

What is the purpose of the 125VDC Diesel Auxiliary Power System Distribution Center?

A

The 125VDC distribution centers provide power to auctioneering diode VADA(B) and the DC Fuel Oil Booster Pump.

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8
Q

What controls/indications are located on the 125VDC Diesel Auxiliary Power System Ground Detection Panel?

A
  1. Voltmeter
  2. Battery Ground Positive Leg and Battery Ground Negative Leg Lamps
  3. Battery Voltage to Ground Voltmeter Mode Selector Switch
  4. Battery Under Voltage Relay
  5. No.27B Battery Under Voltage Relay Test Switch
  6. Battery Ground Detector Test Switch
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9
Q

What is the purpose of the Voltmeter on the Ground Detection Panel?

A

The voltmeter is used to measure voltage to ground if a ground exists.

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10
Q

What is the purpose of the Ground Lights on the Ground Detection Panel?

A

The ground lights are normally dimly lit white lights that will be brightly lit if there is a ground.

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11
Q

What is the purpose of the Battery Voltage to Ground Voltmeter Mode Selector Switch on the Ground Detection Panel?

A

The Battery Voltage to Ground Voltmeter Mode Selector Switch is used to determine the magnitude of the ground. The switch is placed in either the positive or the negative position and the magnitude of the ground will be displayed on the voltmeter.

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12
Q

What is the purpose of the Battery Under Voltage Relay on the Ground Detection Panel?

A

During a bus under voltage condition this relay provides an alarm to both the Control Room and the Operator Aid Computer.

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13
Q

What is the purpose of the No.27B Battery Under Voltage Relay Test Switch and the Battery Ground Detector Test Switch on the Ground Detection Panel?

A
  1. These switches are utilized by I&E during periodic testing.
  2. Both switches when operated insert a resistor into the associated test circuit.
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14
Q

What is the 125VDC Diesel Auxiliary Power System normal lineup?

A
  1. Battery charger is service maintain a float charge on the battery, and carrying the system loads.
  2. Auctioneering diode VADA(B) is available to supply power to 125VDC Distribution Center EDE(F).
  3. The Battery Ventilation Ventilation System is in service to provide cooling for the batteries and prevent accumulation of hydrogen gas.
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15
Q

What is the 125VDC Diesel Auxiliary Power System equalization lineup?

A
  1. The system doesn’t have a spare charger so the associated diesel is removed from service when equalization is in progress.
  2. The 125VDC distribution panel is isolated removing VADA(B) from service.
  3. The diesel can be considered available if an AO is on station while in equalize to realign the system if needed.
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16
Q

What impact will a loss of 125VDC Diesel Auxiliary Power have on the Diesel Generator?

A

If al 125VDC D/G auxiliary power is lost:

  1. The diesel will not start manually or automatically
  2. If power is lost while the D/G is running it cannot be shutdown by normal means.
  3. The Run/Stop knob is still available.
17
Q

What impact will a Blackout have on the 125VDC Diesel Auxiliary Power System?

A
  1. The battery chargers will lose power

2. The batteries will carry the system loads until the diesel generators start and carry the essential buses.

Catawba Nuclear Station (72 decks)

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