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Catawba Nuclear Station > Diesel Generator Engine Fuel Oil System(FD) > Flashcards

Diesel Generator Engine Fuel Oil System(FD) Flashcards

1
Q

What is the purpose of the Diesel Generator Engine Fuel Oil System?

A

The primary purpose of the Diesel Generator Engine Fuel Oil System is to store and supply fuel to the diesel generators’ engines for a period of operation of no less than 7 days.

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2
Q

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

A

FD

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3
Q

What is the description and purpose of the D/G Engine Fuel Oil System Storage Tanks?

A
  1. Two FD Storage Tanks per Emergency Diesel Generator
  2. Each Storage Tank has a 45,000 gallon capacity for a total of 90,000 gallons.
  3. The tanks are centrally located in the yard underground beneath a concrete reinforced missile shield.
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4
Q

How much Fuel Oil is required for 7 days of Emergency Diesel Generator operation?

A

77,100 gallons for 7 days of operation at 5750KW load

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5
Q

How is Fuel Oil Storage Tank level determined?

A
  1. Level is determined by reading a level gauge in %

2. The % is calculated to gallons using an enclosure in the Operating Procedure.

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6
Q

What is the purpose of the Fuel Oil Recirculation and Filtration System?

A

The fuel oil recirculation and filtration system prevents settling, stratification, and deterioration of the fuel oil during extended storage periods. The purpose of the system is to minimize the amount of particulate contaminants being transferred through the Diesel Generator Engine Fuel Oil System by way of the Fuel Oil Storage Tanks.

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7
Q

What are the components of the Fuel Oil Recirculation and Filtration System?

A
  1. One high capacity pump per Unit
  2. Clay polishing filter
  3. Two simplex filters(one pre-filter and one post-filter)
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8
Q

What is the design of the Fuel Oil Recirculation Pump?

A
  1. AC motor driven
  2. Single Stage
  3. Positive displacement
  4. Manually operated
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9
Q

What is the purpose of the Fuel Oil Recirculation Pump?

A
  1. Circulates the contents of the Fuel Oil Storage Tank
  2. Removes accumulated water in the Fuel Oil Storage Tank
  3. Transfers the contents of the Fuel Oil Storage Tank
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10
Q

Where are the Fuel Oil Recirculation Pumps operated from?

A

The recirculation pumps are manually operated from the Diesel Engine Fuel Oil Filtration Skid control panel located outside in the yard.

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11
Q

What is the power supply to the Fuel Oil Recirculation Pumps?

A

The pumps are powered from non-essential 600V MCCs 1MXC and 2MXC.

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12
Q

What conditions will cause a trip of the Fuel Oil Recirculation Pumps?

A
  1. When the D/G reaches 95% speed and voltage whether started manually or automatically - run relay actuated.
  2. When either D/G receives a sequencer start signal(independent of the run-relay) to prevent stirring of sediment.
  3. Any Fuel Oil Storage Tank level decreases to the Technical Specification warning level.
    * A local bypass switch allows the Fuel Oil Recirculation Pump to be used with a Technical Specification low level warning present*
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13
Q

What is the design of the Fuel Oil Recirculation Filters?

A
  1. Pre-filter - removes large particulate contaminants(>5 micron) prior to entering the Clay Filter.
  2. Clay Filter - only used when directed by Engineering when the formation of particulate contaminants is detected in the storage tanks.
  3. Post-filter - ensures no contaminants(>1/2 micron) are released from the polisher to the storage tank.
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14
Q

What is the precaution associated with using the Polisher(Clay Filter)?

A

The Clay Filter will remove chemical additives in the Fuel Oil, so they will have to be replaced when operation is complete.

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15
Q

What is the normal Fuel Oil Recirculation and Filter System alignment?

A

The Recirculation Pump runs continuously with the Pre-Filter and Post-Filter in service. The Clay Filter is normally bypassed, and drained.

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16
Q

What is the design of the Fuel Oil Day Tank?

A
  1. Total capacity is 619 gallons.
  2. Gravity fed from the Fuel Oil Storage Tanks via the by the fill valve.
  3. Surrounded by a Retaining Wall
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17
Q

How is Fuel Oil Day Tank level determined?

A

Level is determined by the static head of the oil in the Day Tank using a pressure gauge.

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18
Q

What is the minimum Fuel Oil Day Tank level required by Technical Specifications, and what is the corresponding pressure reading?

A
  1. The Day Tank shall contain at least 470 gallons in accordance with Tech Specs.
  2. This is verified by ensuring pressure is >1.96psig
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19
Q

What automatic action will occur due to a high level within the Fuel Oil Day Tank Retaining Wall?

A
  1. The associated isolation valve will open

2. The associated Lube Oil Transfer Pump will start and pump the contents to the D/G Lube Oil Pumpout Tanks

20
Q

What is the preferred method for removing fuel oil from the Fuel Oil Day Tank Retaining Wall?

A

The preferred method is for Maintenance to remove fuel oil from the retaining wall using hoses and portable pumps.

21
Q

What is the design/purpose of the Fuel Oil Day Tank Fill Valve?

A
  1. Solenoid operated fil valve

2. Automatically controls Fuel Oil Day Tank Level

22
Q

What is the failure position of the Fuel Oil Day Tank Fill Valve, and why?

A
  1. The fill valve will fail closed on a loss of signal
  2. The fill valve failing in the closed position would prevent a fire hazard caused by overfilling, and then overflowing, the Fuel Oil Day Tank.
23
Q

How is Fuel Oil Day Tank level controlled following a Fill Valve failure?

A

Level is controlled using a manual bypass valve

24
Q

What is the power supply to the Fuel Oil Day Tank Fill Valve?

A

Essential 120VAC from ERPA and ERPD

25
Q

What is the design/purpose of the Motor Driven Fuel Oil Booster Pumps?

A
  1. Positive displacement pump
  2. Normally electrically and mechanically isolated.
  3. May be used to supply fuel oil during maintenance or in an emergency.
  4. Controlled from the DECP using an AUTO/RUN switch.
26
Q

What is the power supply for the Motor Driven Fuel Oil Booster Pumps?

A

DC distribution panels DGDA and DGDB

27
Q

What prevents the Motor Driven Fuel Oil Booster Pump from pumping particulate to the injectors?

A

There is a duplex suction strainer in the suction line of the Motor Driven Fuel Oil Booster Pump.

28
Q

What is the design/purpose of the Engine Driven Fuel Oil Pump?

A
  1. Direct drive
  2. Positive displacement pump - 26gpm
  3. The pump provides flow from the Day Tank to supply all of the diesel’s fuel oil requirements.
29
Q

What prevents the Engine Driven Fuel Oil Pump from pumping particulate to the injectors?

A

There is a duplex strainer in the suction line of the Engine Driven Fuel Oil Booster Pump.

30
Q

What additional component prevents particulate from entering the Diesel Engine Fuel Injectors?

A

There is an engine mounted dual element fuel oil filter on the common discharge of the Engine Driven Fuel Oil Pump and the Motor Driven Fuel Oil Booster Pump.

31
Q

What is the function of the Diesel Engine Drip Headers?

A

The drip headers, one on each side of the diesel engine, collect unburned fuel leakage from within the engine. The unburned fuel is removed from the drip headers and returned to the day tank via an ejector driven by the pressurized fuel oil return from the bypass headers.

32
Q

What is the design of the Fuel Injectors?

A
  1. One fuel injection pump for each cylinder
  2. Cam driven
  3. Internal to the fuel injection pump is a “helix” which is positioned by the fuel rack and the governor to control flow and allow bypass flow.
33
Q

What is the flow path of the Diesel Generator Engine Fuel Oil System during normal operation?

A
  1. Fuel oil from the Fuel Oil Day Tank is supplied to the D/G supply headers via the Engine Driven Fuel Oil Pump.
  2. Each cylinder has a fuel injection pump supplied from the supply header.
  3. Fuel injection pumps provide fuel oil to the cylinders at a rate determined by the governor.
  4. The fuel oil that is not used will drain into one of two drip headers and be sent back to the day tank.
  5. The Fuel Oil Day Tank level is controlled automatically by the Fuel Oil Day Tank Fill Valve.
34
Q

What is the flow path of the Diesel Generator Engine Fuel Oil System while filling the Storage Tanks?

A
  1. The Fuel Oil Storage Tanks are filled from a tanker truck.
  2. Prior to bringing the tanker truck into the Protected Area it will be sampled and tested to ensure it meets acceptance criteria.
  3. Chemicals are added to the as required prior to filling.
  4. To maintain operability of the D/G the tank being filled will be isolated from the D/G.
  5. When filling a tank the Fuel Oil Fill Line Filter is used to prevent unwanted material from entering the tank.
35
Q

What is the flow path of the Diesel Generator Engine Fuel Oil System during Storage Tank Recirculation?

A
  1. Do not recirculate the tank that is aligned to its associated diesel.
  2. Align the Recirculation Pump by opening the suction valve from the storage tank and the recirc inlet valve to the storage tank.
  3. Operate the Recirculation Pump from the skid in the yard.
  4. Initially the fuel oil is recirculated without the pre-filter and post-filter in service to allow for Chemistry Tech Spec sampling.
  5. Following 4 hours of recirculation Chemistry can obtain a sample.
  6. After Chemistry sampling the pre-filter and post-filter are placed in service.
  7. Normally, the storage tanks are recirculated for 24 hours.
36
Q

What is the precaution associated with high tank level an performing recirculation?

A

Fuel Oil Storage Tank recirculation with level greater than 96% may result in discharge from the tank vent.

37
Q

What is required for recirculating a tank with the “MAIN FO TECH SPEC WARN” annunciator in alarm?

A
  1. With SRO permission bypass the Storage Tank Low Level interlock for the Recirculation Pump.
  2. Log bypass of the low level interlock in the Control Room logbook.
  3. Storage tank data shall be recorded every 60 minutes
38
Q

What is the flow path of the Diesel Generator Engine Fuel Oil System while transferring the contents of one Fuel Oil Storage Tank to another?

A
  1. Open the supplying storage tank’s Recirculation Pump suction valve
  2. Open the receiving tank’s recirculation inlet valve.
  3. Use the Recirculation Pump to transfer fuel oil
  4. The Recirculation Filters are placed in service while transferring fuel oil.
39
Q

What is required to shift Fuel Oil Storage Tanks?

A
  1. The outlet valve of the inservice storage tank is closed.

2. The outlet valve of the opposite storage tank is opened.

40
Q

What is the precaution and limitation associated with the Recirculation Pump and D/G operation?

A

Starting a D/G will trip the Fuel Oil Recirculation Pump if it is running and block it from starting until the D/G is shutdown. Plans shall be made to restart the pump if required following D/G operation.

41
Q

What is the precaution and limitation associated with filling a Fuel Oil Storage Tank?

A

Only one Fuel Oil Storage Tank shall be filled at a time.

42
Q

What is the precaution and limitation associated with recirculating a Fuel Oil Storage Tank?

A

Only one Fuel Oil Storage Tank shall be recirculated at a time.

43
Q

What is the precaution and limitation associated with Fuel Oil Storage Tank outlet valves?

A

Fuel Oil Storage Tank outlet valves shall NOT be opened simultaneously unless tank levels are equal.

44
Q

What is the precaution and limitation associated with filling a Fuel Oil Storage Tank?

A
  1. As level approaches 90% while filling a Fuel Oil Storage Tank the fill rate shall be reduced to prevent oil from overflowing from the tank vent pipe.
  2. While fuel oil is being received an operator shall be present at all times.
  3. Unless supervisor directed, a Fuel Oil Storage Tank shall not be filled > approx 96%
45
Q

What is the precaution and limitation associated with the “Polishing” mode?

A

Never place the fuel oil system in the “polishing” mode unless directed by Engineering.

Catawba Nuclear Station (72 decks)

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