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Systems > Containment HVAC > Flashcards

Containment HVAC Flashcards

1
Q

What is purpose of Containment Building Normal ACU ?

A

Used to maintain temp & humidity inside containment to support equipment operability

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2
Q

What’re the the Containment Normal ACUs cooled by ?

A

They’re cooled by Normal Chilled Water

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3
Q

How’re the Containment Building Normal ACU paired together ?

A

A & B are paired
C & D the other pair

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4
Q

What is the normal running arrangement for the Containment Building Normal ACU ?

A

A & C running
OR
B & D running

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5
Q

Where does Containment Building Normal ACU draw air from ? Where is it discharged to ?

A

Draws air from containment & discharges back into containment after being cooled

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6
Q

When are the Containment Building Normal ACU heaters automatically energized ? When do heaters automatically turn off ?

A

-They’re energized when temperature is to low
-Turns off when there is low air flow

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7
Q

Where are Containment Building Normal ACU operated from ?

A

Operated from Control Room

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8
Q

What happens if one of the Normal ACU fans trip ? What is the time delay

A

After 60 seconds the other ACU fan will start

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9
Q

What will trip all operating containment Building Normal ACU ?

A

SIAS will trip all Normal ACUs

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10
Q

What happens to Containment Normal ACUs on LOP ? When power is restored how long will it take for Normal ACUs to restart

A

-ACUs will be loadshed and when power is restored BOP ESFAS Load Sequencer ACU will start after 5 seconds

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11
Q

Where are Containment Building Normal ACU powered from?

A

Powered from CLASS 480VAC LoadCenter(PG)

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12
Q

When are Pre-Access Normal AFU operating ?

A

-Operating for personnel access to containment building DURING power & PRIOR to opening Containment for an outage

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13
Q

What’re the Containment Building Normal subsystem(Pre-Access Normal AFU) used for ?

A

-Controls airborne radioactivity in containment required for personnel access, WITHOUT adding makeup air

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14
Q

Where are the Pre-Access Normal AFU operated from ?

A

Control Room

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15
Q

Where is the Pre-Access Normal AFU powered from ?

A

480VAC LoadCenter (NG)

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16
Q

What does the CEDM Cooling subsystem do ?

A

Provides cooling to CEDM area on top of Reactor Vessel Head for equipment operability

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17
Q

How many CEDM Normal ACUs ? How many Fans in each ACU ?

A

-Two ACUSs
-Two Fans PER ACU

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18
Q

What water is used to cool the CEDM ACUs?

A

Nuclear Cooling Water for Cooling Coils

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19
Q

How many CEDM Normal ACUs are normally running ?

A

-One ACU normally operating with BOTH fans running
-Other ACU is in standby

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20
Q

Where do the CEDM Normal ACU draw air from ? Describe flow path from where the air is drawn from ?

A

-Draws air from bottom of Reactor Vessel Head around CEDMS
-Air is cooled before it’s discharged to upper containment atmosphere

21
Q

Why is it permissible to be able to have one CEDM ACU Fan running ?

A

Operation is permitted because calculations indicate single fan provides adequate cooling for CEDMS

22
Q

Why’re Backdraft dampers installed at discharge of CEDM Normal ACU Fan ? What happens if “Short Cycling” is happening?

A

-Used to prevent revere flow through a secured ACU fan which allows “Short Cycling”
-“Short Cycling” reduced CEDM Cooling

23
Q

If both fans for CEDM Normal ACU trip what will happen ?

A

-Low DP across ACU will be sensed, which will auto start other ACU after 120 seconds

24
Q

What signal will trip ALL the CEDM Normal ACUs?

A

SIAS will trip all

25
Q

What happens to CEDM Normal ACUs on a LOP ? What happens when power is restored ?

A

-CEDM ACUs will load shed
-BOP ESFAS will start them back up after 55 seconds

26
Q

Where are CEDM Normal ACUs powered from ?

A

Powered from PG

27
Q

What do the Reactor Cavity cooling system provide cooling for ?

A

-Cools Reactor Cavity & Primary shield to maintain concrete temp

28
Q

How many Reactor Cavity Cooling fans are there ? Which ones are normally running ?

A

-There are 4 fans “A,B,C,D”
-One fan from each pair are normally running (A,C & B,D)

29
Q

When will the standby Reactor Cavity Cooling fans be energized ?

A

They’re energized manually if Reactor Cavity temp reaches allowable max

30
Q

Where do the Reactor Cavity fans draws air from ?

A

Air is drawn from Containment and discharged into Reactor Cavity area

31
Q

When a ‘Reactor Cavity fan’ trips, how is it sensed and how long will it take to turn the stand by fan on?

A

-Sensed low D/P across fan
-other fan in that pair will auto start after 60 seconds delay

32
Q

What is the Pressurizer Cooling subsystem used for ?

A

Ventilates PZR space within PZR Missile Shield to support equipment operability

33
Q

How many PZR Cooling fans are normally operating?

A

Only one in operation & other fan in standby

34
Q

Where do the PZR Cooling Fans draw air from?

A

-Draws air from TOP of PZR Compartment and exhaust to atmosphere
-When air is drawn from top, there is also air drawn from bottom which cools the PZR Compartment

35
Q

What will trip the PZR Cooling Fans ? What happens when one PZR Cooling Fan trips ?

A

-Low D/P is sensed
-Other fan will start after 60 second delay

36
Q

What signal will trip a PZR Normal Cooling fan ?

A

SIAS

37
Q

Where are the PZR Normal Cooling Fans Powered from ?

A

SIAS LoadShed MCC

38
Q

What is the Tendon Gallery Ventilation system used for ?

A

Supper equipment operability and provide habitable environment

39
Q

What does Tendon Gallery Ventilation consist of ?

A

-Supply Fan
-Exhaust Fan

40
Q

Where are the Tendon Gallery Fans powered from ?

A

480VAC MCC

41
Q

Where does the MSSS Ventilation supply fan, supply air to?

A

-MSSS Building rooms at & above 100’
-Main Steam Containment Penetrations
-Main Feedwater Containment penetrations

42
Q

How many MSSS Ventilation Supply & Exhaust fans are normally running ?

A

-Operated LOCALLY

-One 100% capacity supply running

-Two 100% exhaust fans for main steam and Feedwater penetrations

43
Q

Where are the Main Steam & Main Feedwater Supply/Exhaust Fans operated from?

A

-Operated by local handswitch inside panel next to fans

44
Q

What trips a MSSS Supply Fan ? What happens when it trips ?

A

-Sensed Low D/P will trip fan
-Other fan starts in 60 seconds

45
Q

Where are MSSS Supply/ Exhaust fans powered from ?

A

Powered from 480VAC MCC (NH)

46
Q

What building is RU-1 Monitoring? Where does it draw its sample from & where does it discharge too?

A

-Containment Building Atmosphere
-Draws from containment & discharges back to containment

47
Q

What will close the Containment Isolation Valves for the RU-1 suction/return line ?

A

CIAS will close the Containment Isolation Valves

48
Q

What is the Tech Spec for Containment Air Temperature ?

A

It should be less than 117F

Systems (62 decks)

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