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Systems > Fuel Building HVAC (HF) > Flashcards

Fuel Building HVAC (HF) Flashcards

1
Q

Where does essential HVAC system provide negative pressure to during a SIAS?

A

Fuel building Essential HVAC provides negative pressure below 100’ of Aux Building

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2
Q

What is the Power Generation Design Basis for Fuel Building Normal HVAC ?

A

Designed to maintain temp for:
-Operability of Fuel Building Equip.
-Provides required ventilation to maintain airborne radioactivity

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3
Q

Does Fuel Building Essential HVAC have a Power Generation Design Basis ?

A

NO it doesn’t

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4
Q

What is Safety Design Basis for Fuel Building Essential HVAC ?

A

-Limit potential release radioactive iodine event fuel handling accident or design basis LOCA
-Functions during & after Safe Shutdown Earthquake(SSE)
-Not allow any single failures

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5
Q

How does Fuel Building Supply Air system work during Normal Operation ?

A

1.)Outside air filtered
2.)Cooled & Heated by AHUs
3.) Supplied throughout fuel building on once through basis

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6
Q

How does Fuel Building Exhaust system work during Normal Operation ?

A

Exhaust air from various areas of fuel building is exhausted continuously by Exhaust Fans

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7
Q

What happens to Fuel Building system Lineup During a FBEVAS ?

A

-Normal supply AHUs & Exhaust fans are stopped
-Fuel Building is automatically isolated by isolation dampers on supply & exhaust ducts
-Air is then exhausted through Essential AFUs, while makeup air is drawn into building by Essential AFUs negative pressure

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8
Q

What is Fuel Building Lineup during a SIAS ?

A

-Essential AFU intake air damper for fuel building will close & Aux. intake damper will open
-Essential AFU will start
-Essential AFU will draw & maintain a negative pressure below 100’ of Aux. Building
-Exhausts air through Aux. Building Essential Pipe Tunnel to Unit, then Atmosphere

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9
Q

During a SIAS what happens to Normal Fuel Building HVAC ?

A

Normal Exhaust & Supply dampers will remain open ONLY on SIAS

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10
Q

What happens to Normal Supply & exhaust dampers HVAC during a FBEVAS ?

A

Normal supply & exhaust will close dampers on FBEVAS. They won’t reopen reopen if a SIAS is actuated

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11
Q

What event has priority over Fuel Building HVAC if a SIAS & FBEVAS were to happen at the same time ?

A

-SIAS has priority and all fuel building intake
-exhaust dampers will close if a SIAS & FBEVAS happen at the same time

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12
Q

How does Non-class 480 Load Center(NG) interface with Fuel Building HVAC(HF) ?

A

HF AFU heater control receives power from NG

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13
Q

How does HF interface with 480VAC MCC(NH) ?

A

Normal HF components receiver power from NH

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14
Q

How does HF interface with Control Power(NK) ?

A

Normal HF system duct heater control circuit receiver power from NK

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15
Q

How does HF system interface with Class 480VAC MCC (PH)?

A

Powers Essential HF components:
-Essential AFU fans
-Essential AFU Heaters
-Essential AFU dampers(120VAC from MCC D-Panel )

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16
Q

How does HF interface with PK Control Power ?

A

Safety related dampers in Normal Supply line receives operating power from PK

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17
Q

How does HF system interface with Diesel Generator ?

A

DGs serve as essential standby power source for HF system

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18
Q

How does HF system interface with Chemical & Volume Control(CH) ?

A

-RWT & CVCS HUT both vent to Fuel Building Normal HVAC discharge system
-Provides means to monitor Radioactive Vent Discharge

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19
Q

How does HF interface with Domestic Water(DS) ?

A

DS provides source of water to Fuel Building Normal AHU Air Washer

20
Q

How does HF interface with Fire Protection ?

A

-HF is big part of safe plant shutdown during a fire
-HF system has fire dampers
-HF essential AFU have water hookups to deluge fire extinguish nozzles in the charcoal bed

21
Q

How does HF interface with Aux. Building HVAC ?

A

-HF provides Essential Exhaust & filtration for Aux. Building below 100’
THIS IS SAFETY RELATED

22
Q

How does HF interface with Instrument Air(IA) ?

A

IA provides air to 8 safety related isolation dampers in Norm. Ventilation System

23
Q

How does HF interface with Freeze Protection(QJ) ?

A

-During winter water supply to Air Washer is isolated
-Air Washer pump is turned off
-Air Washer Basin is drained

24
Q

How does HF interface with Radiation Monitoring(SQ)?

A

-SQ provides monitoring of HF exhaust
-SQ could actuate a FBEVAS
-HF system provides flow signal input to SQ system for signal processing from Radiation Monitoring

25
Q

What’re the 3 radiation monitors ? What does each Radiation Monitor do ?

A

RU-31:Monitors Fuel Pool & generates FBEVAS on high Radiation Levels
RU-145:Monitors Fuel Building exhaust & generates FBEVAS
RU-146:High Range monitor monitors exhaust at higher level(Safety Related)

26
Q

How many supply AHUs have does the normal HVAC have ?

A

Two 50% capacity supply AHUs

27
Q

Where does Fuel Building Supply fan draw its air from ?

A

Draws air from outside through AHU which cools is adiabatically

28
Q

When will the Heaters turn on down stream of the supply fan ? When will it automatically turn off ?

A

-Heaters will turn on when temp in Normal Exhaust Plenum drops below 65F
-Heaters automatically turn off during low flow conditions

29
Q

Where does discharge of Normal Supply AHUs go to after the heaters ?

A

-Will discharge into a common header & penetrates fuel building
-Inside fuel building ducts split into two, each duct with a CLASS pneumatic isolation damper

30
Q

What happens when a FBEVAS is generated?

A

-Fuel Building isolated automatically by closing 8 safety related isolation dampers in Normal Supply & Exhaust ductwork
-Normal Supply AHU & Exhaust fans are stopped
-Two Essential AFU are started

31
Q

How is air makeup provided to fuel building during a FBEVAS ?

A

During this mode is drawn into fuel building by negative pressure by Essential Exhaust AHUs

32
Q

How many Essential AFU are there ? What’re the capacity of the Essential AFUs ?

A

There are two Essential AFU & they’re both 100% capacity

33
Q

Where do the Essential AFUs exhaust to ?

A

Essential AFUs will exhaust to the Fuel Building Normal HVAC exhaust

34
Q

Where are the Essential Exhaust Trains connected to inside the Aux. Building ?

A

-They’re connected to ESF equipment rooms , through seismic plenum & tunnel
(HPSI,LPSI,CS, SDCHX Room)

35
Q

Essential Exhaust systems are only used why ?

A

Functions only in event during fuel handling accident, LOCA,or required testing

36
Q

What’re the features for the Essential AFUs Filter Unit Housing?

A

-Seismic Category
-Service access doors
-Explosion proof light
-Filter test connection
-Pressure gauge connections
-Floor drains

37
Q

What conditions must be maintained when opening Essential AFUs doors to not affect AFUs operability ?

A

-Communication maintained with Control Room to close door if necessary
-Doors remain functional & capable of being closed

38
Q

What’re the heater elements used inside the Essential AFU ? How’re the heater elements controlled

A

-Preheats Aux.Building or Fuel Building HVAC to ensure humidity <70% to not affect Charcoal Adsorbers
-Moisture Elements & Moisture Switch HI located down stream of Heater

39
Q

What’re the High Efficiency Pre-Filters used for ?

A

Filters out large particulate of 85%

40
Q

What’re the HEPA filters used for ?

A

Filters out 99.97% of 0.3 micron

41
Q

What’re the Charcoal Adsorbers used for in the Essential AFU?

A

Filters our methyliodide from Exhaust air with 99% efficiency

42
Q

What is the ignition point for the Essential AFUs charcoal Adsorbers ? What is used as fire protection on the Essential AFUs if Charcoal Adsorbers catch fire ?

A

-625F is ignition point
-Deluge system supplied from fire hose made up by fire department
-Water applied to Charcoal Adsorbers will release adsorbed material

43
Q

What is used to prevent damage to Fuel Building AFU?

A

Welding, painting, & use of solvents in fuel building or any zone communicating with AFUs

44
Q

What is the HEPA filter downstream of the charcoal Adsborber used for ?

A

Filters out loose charcoal particulate from exhaust air to minimize release radioactive iodine

45
Q

What is the exhaust fan used for in the Essential AFU?

A

Draws air through AFU and exhausts it from Fuel Building after FBEVAS, or Aux. Building after SIAS

Systems (62 decks)

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