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Systems > Aux Building HVAC (HA) > Flashcards

Aux Building HVAC (HA) Flashcards

1
Q

What is the normal & essential HVAC used for ?

A

-Normal HVAC maintains environmental condition for personnel comfort & equipment operability during normal operation
-Essential HVAC serves ESF equipment rooms & safety related Aux Feed Pump Rooms

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2
Q

What’re the functions of the HA system ?

A

-Maintains slight negative pressure
-control air flow from areas of low airborne radioactivity to progressively higher airborne radioactivity
-Filters the exhaust air prior to discharge atmosphere

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3
Q

What subsystems do the Normal HVAC consist of ?

A

-Aux. Building Supply Air
-Aux. Building Exhaust Air
-Access Control Area
-Charging Pump Room
-CEDM Recirculation

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4
Q

What rooms have Essential ACUs from Essential HVAC system?

A

-HPSI Pump Room
-LPSI Pump Room
-CS Pump Room
-EW Pump Room
-Aux. FW Pump Room
-ESF Electrical Penetration Rooms

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5
Q

What is the normal operation of Aux. Building Supply Air system ?

A

Outside air is filtered, cooled, & heated by AHU which is then supplied to different rooms, the treated air from AHU is supplied to Normal Access ACU

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6
Q

What is normal operation of Aux. Building Exhaust Air system ?

A

-Within building air flows from potential low radioactivity to higher radioactivity areas
-Continuously exhausted by Normal Exhaust Air Filtration Units

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7
Q

Where is air from the Access Control Room exhausted to ?

A

It’s exhausted through Aux.Building Normal exhaust Air Filtration Units

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8
Q

What happens to Aux Building Normal HVAC during a LOP & SIAS ?

A

ESF equipment rooms & safety related Aux Feedwater Pumps are isolated from Aux.Building Normal HVAC

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9
Q

Following a SIAS how is negative pressure maintained below 100’ once isolated from normal HVAC system ?

A

-Negative pressure maintained by Fuel Building Air Filtration Unite provided
-Air from ESF equip. Room flows through connecting tunnel to fuel building AFU where it’s filtered & released to atmosphere

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10
Q

What is the HA system Fire Damper Configuration ?

A
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11
Q

What is the capacity of each Normal Supply AHU?

A

-Rated at 50% capacity(29,200)

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12
Q

What cooling water is sent through the Normal AHU cooling coils ?

A

Normal chilled water is sent through cooling coils

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13
Q

Where is each AHU heater installed at ? What is it used for ?

A
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14
Q

What is the common header pneumatically operated isolation damper interlocked with ?

A

It’s interlocked to open/close when fans are started/stopped

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15
Q

Where are AHU operated from ?

A

They’re operated from control room & equipped with interlock to ensure number of running AHUs is less than normal exhaust AFUs

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16
Q

Why must there be less or equal running AHU than normal exhaust AFU? How does this mechanism work ?

A

-This is done to maintain negative pressure
-Mechanism is DP across each Normal Exhaust AFU

17
Q

What happens when Normal Supply AHU hits low DP setpoint ?

A

It will secure appropriate Normal Supply AHU

18
Q

What is the normal operation of Normal Supply AHU & Normal Exhaust AFU ?

A

-Normally both supply & exhaust fans are running

19
Q

What happens if you lose a exhaust fan ?

A

If you lose an exhaust fan, then the opposite train will lose its supply fan(Vice versa between each train)

20
Q

What happens if you tried starting two supply fans while there is only one exhaust Fan ?

A

There is an interlock that will trip one of the supply fans to maintain negative pressure in the building

21
Q

What does a duel duct do for the Access Control Area Normal AHU ?

A

One duct has hot air from heaters & one duct from cooling coil both enter a mixing box that has dampers to control hot air duct ONLY

22
Q

When does the Charging Pump Room Normal ACUs turn on & off ?

A

Starts when pump starts & turns off 5 minutes after pump stops

23
Q

What cools charging pump normal ACU ?

A

Normal chilled water goes through cooling coils

24
Q

How many normal ACUs are in the CEDMCS room ? What is there Capcity ?

A

Two ACU are in service & each one has 100% capacity

25
Q

How do the CEDMCS normal ACUs start ?

A

They’re started by local hand switch near the ACU

26
Q

What capacity are the Normal Exhaust AFU ?

A

Two 50% capacity

27
Q

What’re the major components through the AFU ?

A

High Efficiency Pre-Filter -Filters large particles
HEPA-99.97% of finer particles
Charcoal Absorber filter- Filters methyliodide/iodine 99% efficient
-HEPA

28
Q

What is the ignition point of charcoal adbsorption ?

A

625F fire indicated by temp switch Hi-Hi

29
Q

What’re the four indicating lights for temp detection system panel locally at each AFU ?

A

Green-system normal
Yellow-Detection pre alarm 265F temp switch hi alarms in control room
RED- Detection alarm 310F Hi-Hi alarm in control room
White-indicated detector failure

30
Q

When will ESF Electrical Penetration Room ACUs automatically start ?

A

-LOP
-SIAS

Systems (62 decks)

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