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RO34 - Revised and Upgraded Decks > Containment Ventilation > Flashcards

Containment Ventilation Flashcards

1
Q

What are the Phase “A” trips for Ctmnt Ventilation?

A
  • Containment Purge Valves Close
  • Instrument Rm Purge Valves Close
  • Containment Pressure Relief Valves Close
  • Containment Upper Vent Fans
  • Instrument Rm Fans
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2
Q

What trips on a Phase “B” signal for Ctmnt Ventilation?

A
  • Ctmt Lower Vent Fans
  • CRDM Fans
  • Pressurizer Enclosure Fans
  • Reactor Cavity Fans
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3
Q

What trips on a CVI signal for Ctmnt Ventilation?

A
  • Containment Purge Fans and Valves
  • Instrument Room Fans and Valves
  • Containment Pressure Relief Fan and Valves
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4
Q

What does the CVI Train A isolate/trip?

A

Inside Ctmnt valves plus Trips Instrument Rm Purge Supply Fan

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5
Q

What does the CVI Train B isolate/trip?

A

Outside Ctmnt valves plus trips all other fans

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6
Q

What Ctmnt Ventilation trips on a Load Conservation?

A
  • Containment Pressure Relief Fan
  • Ctmt Upper Vent Fans
  • Instrument Room Fans
  • Pzr Enclosure Fan
  • Hot Sleeve Fans
  • Rx Cavity Fans
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7
Q

What normally running Ctmnt Ventilation does NOT trip on a Load Conservation?

A
  • CLVs (need for containment pressure)
  • CRDM fans (needed for Nat Circ cooldown)
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8
Q

What happens with Ctmnt Ventilation when a 1 psi in lower ctmnt signal is received?

A
  • CEQ fan Cooling Valves Open
  • U1 CEQ Fan starts on 283 sec time delay
    (Fan suction valves open on fan start)
  • U2 CEQ Fan starts on 2 min time delay
    (Fan suction valves open on fan start)
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9
Q

How will Containment Pressure Relief Damper, VDC-207 fail on a loss of ctrl air?

A

open

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10
Q

What starts/opens on a 1 psi in Ctmnt signal?

A

CEQ fans start and suction valves open on the start

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11
Q

What do you use to reduce pressure in ctmnt if > 0.3 psi?

A

Containment Pressure Relief Fan (Normal)

CPS/CPX would be abnormal

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12
Q

What will give you a Containment Vent Isolation?

A
  • High Rad in Upper or Lower Ctmnt
  • Manual Phase A
  • Manual Phase B
  • Manual or Auto SI
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13
Q

What Ctmnt Ventilation will trip on a charcoal filter fire?

A
  • Inst Room Purge Exhaust Fan
  • CPR Fan
    (Both will restart once temp is < 400°F)
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14
Q

What is your CEQ fan trying to maintain while its running?

A

< 4% Hydrogen atmosphere in Ctmnt

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15
Q

What are the places where the CEQ fans take a suction?

A
  • SG enclosures
  • Pzr Enclosure
  • CLV fan rooms
  • IR
  • Upper Cntmt Dome
  • Lower Ctmnt general area
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16
Q

When Phase A ctmnt isolation signal is reset, what will automatically realign?

A

Containment Upper Vent Units (CUVs) will automatically restart

17
Q

Where does the CEQ fan exhaust to?

A

Lower Vent Unit Fan Area

18
Q

During normal plant operation, control air to Containment Pressure Relief Inlet Volume Damper, VDC-207, is lost due to a small leak at the air valve.

How is Containment Pressure Relief System operation affected?

(ASSUME the leak does NOT effect any other component or system)

A

The system can be operated at full flow as the damper fails open

19
Q

If a small instrument air leak inside Containment causes a slow rise in Containment pressure, what should be done to reduce Containment pressure?

A

The Containment should be vented using the Containment Pressure Relief system.

20
Q

Which Ctmnt Vent Fan has the only electric heater that is outside ctmnt?

A

Intrument Room Purge Supply Fan

21
Q

Following a Design Basis Loss of Coolant Accident, portions of the Containment Ventilation System are used to:

A

Ensure that in case of a LOCA, any hydrogen formation does not accumulate in isolated pockets in excess of 4% by volume

22
Q

Following a Design Basis Loss of Coolant Accident (DB LOCA), portions of the Containment Ventilation System are used to …

A

aid in the reduction of containment pressure after blowdown

23
Q

What is the flowpath for the containment purge supply fans?

A

Outside air is drawn in through an intake hood on the roof of the Auxiliary building.

The air flows through a roughing filter, medium efficiency filter, steam heating coil, and the supply fan.

The supply fan discharges the air through a backdraft damper to the common supply header which directs the air to the upper and lower compartments.

24
Q

What is the flowpath for the containment purge exhaust fans?

A

Two exhaust fans draw air from the upper and lower containment volumes through inside and outside containment isolation valves.

The air flows** through a HEPA filter to the fan suction and is discharged through a backdraft damper to the plant vent.**

RO34 - Revised and Upgraded Decks (84 decks)

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