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Catawba Nuclear Station > Diesel Generator Lube Oil System(LD) > Flashcards

Diesel Generator Lube Oil System(LD) Flashcards

1
Q

What is the purpose of the Diesel Generator Engine Lube Oil System(LD)?

A

The Diesel Generator Engine Lube Oil system is designed to supply lubricating oil to the diesel engine and it’s bearings, crankshaft, thrust faces, and other friction surfaces during both standby mode and operation of the diesel generator.

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2
Q

What is the system designator for the Diesel Generator Engine Lube Oil System?

A

LD

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3
Q

What is the purpose of the Lube Oil Sump Tank?

A
  1. 579 gallon capacity tank that with a normal operating volume of 450 gallons.
  2. The Lube Oil Sump is separate from, and at a lower elevation than the engine crankcase to allow gravity-assisted drainage.
  3. The dry-sump is used to minimize lube oil degradation by minimizing exposure to and oxidation by crankcase gases.
  4. Provides sufficient volume to ensure the D/G can operate for 7 days without being refilled.
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4
Q

What is the purpose of the Lube Oil Sump Tank Heater?

A

The Lube Oil Heater is an electric immersion heater located in the Lube Oil Sump Tank that maintains lube oil temperature at approximately 145F to minimize thermal stress on the diesel components.

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5
Q

How is the Lube Oil Sump Tank Heater controlled?

A
  1. The lube oil heater is thermostatically controlled.
  2. The lube oil heater/pump can be controlled in auto or manual via a selector switch on the diesel engine control panel.
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6
Q

What is the interlock associated with the Lube Oil Heater and the Diesel Generator?

A

The lube oil heater is interlocked through the diesel run relays so that the heater operates any time the diesel is not running.

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7
Q

What is the purpose of the Pre-Lube Oil Pump?

A

The Pre-Lube Oil Pump provides warm lube oil to the diesel generator during the standby mode to preclude dry starting of the diesel engine - a momentary lack of lubrication at the various moving parts or bearing surfaces in the diesel generator.

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8
Q

What are the flow paths of the Pre-Lube Oil Pump?

A
  1. The Pre-Lube Oil Pump takes a suction off the sump tank and pumps lube oil through a filter and strainer prior to sending it through the crankcase.
  2. The lube oil bypasses the lube oil cooler, turbochargers, and cylinder heads normally while in standby.
  3. Prior to a planned start of the D/G an additional flow path is lined up to provide oil to these normally bypassed components.
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9
Q

What is the design of the Pre-Lube Oil Pump?

A
  1. 600VAC motor driven positive displacement pump

2. 90 gallon per minute flow rate

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10
Q

What is the power supply for the Pre-Lube Oil Pump?

A

EMXE and EMXF

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11
Q

What is the power supply for the Lube Oil Sump Tank Heater?

A

EMXE and EMXF

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12
Q

What are the interlocks associated with the Pre-Lube Oil Pump?

A

The Pre-Lube Oil Pump automatically:

  1. Starts when the Diesel is shutdown
  2. Stops when the Diesel is started
    * With the selector switch in AUTO*
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13
Q

What is the purpose of the Pre-Lube Oil Filter and Strainer?

A
  1. The filter is a simplex filter which removes contaminants from the lube oil prior to entering the diesel.
  2. The strainer, located downstream of the filter, is a simplex strainer that protects the diesel from particulate not removed by the filter and filter material if the filter failed.
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14
Q

What is the purpose of the Engine Driven Lube Oil Pump?

A
  1. The Engine Driven Lube Oil Pump provides the motive force to circulate lube oil to its associated diesel generator during operation.
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15
Q

What is the design of the Engine Driven Lube Oil Pump?

A
  1. Engine driven
  2. Rotary screw type constant displacement pump
  3. Two pressure regulating valves on the discharge of the pump maintain a constant engine inlet pressure of 50psig, and also provide safety relief protection.
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16
Q

What is the purpose of the Lube Oil Cooler?

A

The Lube Oil Cooler is a shell and tube heat exchanger that transfers the heat of the engine’s parts to the Diesel Generator Engine Cooling Water(KD).

17
Q

What is the purpose of the Full Flow Lube Oil Filters?

A
  1. Retain the original condition of the oil as nearly as possible.
  2. Protect the engine from long term degredation due to particulate buildup
  3. Provide satisfactory oil life
18
Q

What is the design of the Full Flow Lube Oil Filter?

A
  1. Duplex type
  2. Cartridge Filter
  3. Each filter housing is continuously vented to prevent a pressure buildup in the out-of-service filter.
19
Q

What is the purpose of the Lube Oil Intake Strainers?

A

The Lube Oil Intake Strainers, located downstream of the Full Flow Lube Oil Filters, stop large foreign material from entering the engine thus preventing damage to close tolerance parts.

20
Q

What is the design of the Lube Oil Intake Strainers?

A

The Lube Oil Intake Strainers are two completely isolable duplex strainers which provide protection against a failure of the lube oil filter.

21
Q

What is the purpose of the Turbocharger Oil Solenoid Valve?

A

The Turbocharger Oil Solenoid Valve is used to provide adequate start-up lubrication to parts that aren’t in the normal pre-lube flow path.

22
Q

Where is the Turbocharger Oil Solenoid Valve controlled from?

A

The turbocharger oil solenoid valve is controlled from the Diesel Engine Control Panel with a two position switch.

23
Q

What is the interlock associated with the Turbocharger Oil Solenoid Valve?

A

When the D/G speed is greater than 430rpm the turbocharger oil solenoid valve will close.

24
Q

What is the precaution associated with leaving the Turbocharger Oil Solenoid Valve open while the diesel is shutdown?

A

If the valve is left open with the diesel shutdown oil may intrude into the turbocharger and create a fire hazard when the diesel starts.

25
Q

What are the Diesel Generator trips associated with low lube oil pressure?

A
  1. Low Lube Oil Pressure - 35psig

2. Low-Low Lube Oil Pressure - 30psig

26
Q

When are the Diesel Generator trips associated with low lube oil pressure active?

A
  1. Both trips are bypassed for the first 60 seconds of diesel operation.
  2. The low lube oil pressure trip is bypassed during emergency operation.
  3. The low-low lube oil pressure trip is active during all modes of operation.
27
Q

What type of logic does the Diesel Generator Low-Low Lube Oil Pressure trip use?

A

Three independent measurements of lube oil pressure are utilized, and for a trip to occur 2 out of 3 channels are required.

28
Q

How is the Diesel Generator Low-Low Lube Oil Pressure trip reset?

A

Once tripped the low-low oil pressure trip is sealed in and must be reset manually by an operator via the DG A(B) Reset Overspeed and LoLo Lube Oil Pushbutton.

29
Q

What is the Diesel Generator trip associated with Diesel Engine Turbocharger Low Lube Oil Pressure?

A

Less than 15psig Turbocharger lube oil pressure

30
Q

When is the Diesel Generator trip associated with Diesel Engine Turbocharger Low Lube Oil Pressure active?

A
  1. The trip is bypassed for the first 60 seconds of diesel operation.
  2. The diesel engine turbocharger low lube oil pressure trip is bypassed during emergency operation.
31
Q

What is the Diesel Generator trip associated with Lube Oil Outlet Temperature?

A

During engine operation a D/G trip is provided on high lube oil outlet temperature if the temperature exceeds 200F.

32
Q

When is the Diesel Generator trip associated with Lube Oil Outlet Temperature active?

A
  1. The trip is bypassed for the first 60 seconds of diesel operation.
  2. The diesel engine lube oil outlet temperature trip is bypassed during emergency operation.
33
Q

What is the Diesel Generator trip associated with Diesel Engine Crankshaft Bearing Temperature?

A

Ten temperature detectors are provided for each engine to monitor the temperature of the crankshaft bearings. A trip signal is generated if temperature exceeds 228F.

34
Q

When is the Diesel Generator trip associated with Diesel Engine Crankshaft Bearing Temperature active?

A

The diesel engine crankshaft bearing temperature trip is bypassed during emergency operation.
There is no 60 second bypass of this trip on startup

Catawba Nuclear Station (72 decks)

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