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Catawba Nuclear Station > Fuel Pool Ventilation System(VF) > Flashcards

Fuel Pool Ventilation System(VF) Flashcards

1
Q

What is the purpose of the Fuel Pool Ventilation System?

A
  1. Control fission product emissions following a fuel handling accident(the only safety related function)
  2. Maintain a suitable environment for the operation, maintenance, and testing of equipment
  3. Maintain a suitable access and working environment for personnel.
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2
Q

What is the system designator for the Fuel Pool Ventilation System?

A

VF

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3
Q

What is the capacity of a Fuel Pool Ventilation Supply Fan?

A

A Supply Fan is 100% capacity, with a flow rate of 26,260cfm.

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4
Q

What areas receive air from the Fuel Pool Ventilation Supply Fan?

A
  1. Fuel Pool Area
  2. New Fuel Storage Area
  3. Fuel Unloading Area(RR Bay)
  4. ‘B’ Train VF Filter Unit Room
  5. Hot Instrument Storage Area(I&E)
  6. Upper Containment/Reactor Building Access Area
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5
Q

How many Supply Fans are there for each unit?

A

1 Supply Fan for each unit

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6
Q

What components makeup the Supply Air Handling Unit?

A

The Supply AHU consists of:

  1. Outside Air Damper
  2. Inlet Filter
  3. Finned Tube Heating Coil
  4. Finned Tube Cooling Coil
  5. Belt Driven Centrifugal Supply Fan
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7
Q

What is the design characteristics of the Supply Damper?

A
  1. The Supply Damper Fails Closed.
  2. The Supply Damper opens when one of the two Exhaust Filter Trains start.
  3. The Supply Damper is a Tornado Isolation Damper.
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8
Q

What systems provide heating and cooling for the Supply Air Handling Unit?

A
  1. Heating is supplied by Plant Heating(YH)

2. Cooling is supplied by Containment Chilled Water(YV)

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9
Q

How many Exhaust Trains/Fans are there for each unit?

A
  1. There are two Exhaust Trains for each unit.
  2. Each train consists of:
    A. Two 50% Exhaust Fans
    B. Two Exhaust Filter Assemblies, one for each Exhaust Fan
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10
Q

What is the normal flow path through the Fuel Pool Ventilation Exhaust path?

A

The normal flow path has 2 Exhaust Fans in operation with their Filter Assemblies bypassed.

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11
Q

How many air changes over the Fuel Pool do the Exhaust Fans achieve in one hour?

A

10 air changes per hour to:

  1. Ensures radioactive material released from the pool is captured.
  2. Reduces the relative humidity of the air for personnel comfort.
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12
Q

What components make up the Exhaust Filter Assembly?

A
  1. Prefilters
  2. Electric Heater
  3. Absolute Filter(Carbon Bed)
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13
Q

What type of damper is the Exhaust Train Inlet Damper and how does it fail?

A

The Exhaust Train Inlet Damper is electro-hydraulically operated and fails in the open position.

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14
Q

What type of dampers are used for the Exhaust Filter Assembly Inlet, Outlet, and Bypass? How do they fail?

A
  1. The dampers used for the inlet, outlet, and bypass around the Exhaust Filter Assembly are pneumatically operated.
  2. The dampers fail:
    A. Inlet - Open
    B. Outlet - Open
    C. Bypass - Closed
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15
Q

What is the normal flow path through the Exhaust Train as it pertains to the Exhaust Filter Assemblies?

A

The Filter Assemblies are normally bypassed.

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16
Q

What will cause the Exhaust Filter Assemblies to be automatically/manually placed in service?

A

Automatically:

  1. EMF-42 High Rad Trip 2
  2. EMF-35, and EMF-36 High Rad Trip 2
  3. VC-YC switch to “Local” position

Manually:

  1. When EMF-42 is INOPERABLE to comply with SLC
  2. For testing as required
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17
Q

Where are the controls for the VF system located?

A

The VF system is controlled from MC-5R in the Control Room.

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18
Q

What is the purpose of the Mini-Flow Recirc Cross Connect Valves?

A

They are used to cool a filter bed that has a high temperature due to the decay heat produced from radio-iodine collected in the charcoal bed following an accident.

19
Q

What is the affect on the Mini-Flow Recirc Cross Connect Valves with their control switch in AUTO?

A

With the switch in AUTO at MC-5R, the valve that allows air flow through the filters, will automatically shut for the associated train when that train is started.

20
Q

What is the position of the Filter Assembly Isolation Dampers based on the VF Filter Mode Select Switch position?

A
  1. Open in the Filter Mode
  2. Closed in the Bypass Mode
  3. Fail Open
21
Q

What is the position of the Filter Assembly Bypass Damper based on the VF Filter Mode Select Switch position?

A
  1. Open in the Bypass Mode
  2. Closed in the Filter Mode
  3. Fails Closed
22
Q

What is special about the Filter Assembly Outlet and Bypass Dampers?

A

The Filter Assembly Outlet and Bypass Dampers are also Tornado Barriers.

23
Q

What are the differences between the Unit 1 and 2 Fuel Pool Ventilation Systems?

A
  1. Unit 1 Containment Chiller water must be manually throttled to maintain supply air temperature greater than or equal to 70F.
  2. Unit 2 only has a thermostat that controls heating and cooling water supplies to maintain the outlet of the Supply Unit temperature at 60F.
24
Q

What is the normal position of the VF Filter Mode Select Switch for the operating and the standby train?

A
  1. Operating train - Bypass

2. Standby Train - Filter

25
Q

How are the VF Filter Trains interlocked?

A

There is an interlock that allows only one filter train to run at a time.

26
Q

What affect does a LOCA have on the VF Filter Trains?

A

The Filter Trains trip on LOCA sequencer actuation.

27
Q

What affect does a Blackout have on the VF Filter Trains?

A

The Filter Trains start if a Blackout occurs.

28
Q

What affect do smoke alarms have on the VF System?

A
  1. The Exhaust Fans continue to run

2. The Exhaust Fans can be shutdown manually from the Control Room.

29
Q

What affect does placing Control Room Ventilation(VC)/Control Area Chilled Water(YC) in LOCAL have on the VF system?

A
  1. All Control Room controls and interlocks are bypassed.

2. VF Filters receive a signal to align to the Filter mode.

30
Q

What is the interlock associated with Supply Fan low inlet temperature?

A

40F - freeze protection is sensed at the outlet of the heating/cooling coil and will trip the Supply Fan.

31
Q

What is the interlock associated with Supply Fan high inlet temperature?

A

160F - filter train inlet greater than setpoint will trip the Supply Fan.

32
Q

What is the Fuel Pool Ventilation System interface with Plant Heating(YH)?

A

Plant Heating provides the hot water to the heating coils to control incoming air temperature.

33
Q

What is the Fuel Pool Ventilation System interface with Containment Chilled Water(YV)?

A

Containment Chilled Water provides the cold water for the cooling coils to control incoming air temperature.

34
Q

What is the Fuel Pool Ventilation System interface with Fire Protection(RF)?

A

Fire Protection provides water for the Exhaust Filter deluge in case of fire.

35
Q

What is the Fuel Pool Ventilation System interface with Radiation Monitoring(EMF)?

A

Radiation Monitoring(EMF-35, EMF-36, and EMF-42) provides a signal when high radiation is detected to the Fuel Pool Ventilation Exhaust system to go to the filter mode.

36
Q

Why do we normally bypass the Exhaust Filter?

A

To extend the life of the filters and carbon bed

37
Q

Why is the standby Exhaust filter normally in Filter Mode?

A

To extend the life of the Filter Damper Actuator

38
Q

What affect does a LOCA have on the VF Exhaust Fans?

A
  1. The Exhaust Fans are automatically stopped by the LOCA Sequencer. The sequencer must be reset to allow manually starting the Exhaust Fans.
39
Q

What is the affect on the Exhaust Fans during a loss of electrical power?

A
  1. Exhaust Fans are automatically restarted by a Blackout sequencer.
40
Q

Following a loss of electrical power which Exhaust Train will start?

A

The Exhaust train which receives the start signal first will start regardless of which train was previously running. Only one train will start due to the interlock.

41
Q

What part of the system design ensures that the Exhaust Filter Outlet Damper has the ability to close for tornado isolation?

A

There are air tanks to provide air pressure for closing the Exhaust Filter Outlet Damper if instrument air is lost.

42
Q

When is the Fuel Pool Ventilation Exhaust System required to be in service?

A

During the movement of recently irradiated fuel assemblies in the Fuel Building

43
Q

What is the power supply for the for the Exhaust Fans, Cooling Bypass (Miniflow) Valves, and Filter Train Heaters?

A

Essential 600V MCCs

44
Q

What is the power supply for the Supply Fans?

A

Non-essential 600V MCCs

Catawba Nuclear Station (72 decks)

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