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My NLIT > HF-Fuel Building HVAC > Flashcards

HF-Fuel Building HVAC Flashcards

1
Q

What is the purpose of the Fuel Building HVAC?

A

provides a controlled temperature environment to ensure personnel comfort and safety and to ensure equipment integrity

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2
Q

What are the two separate HVAC subsystems in the Fuel Building?

A

Normal- during normal plant operation only
Essential-only in the event of a fuel handling accident or LOCA

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3
Q

Why do we keep Fuel Building HVAC at a negative pressure?

A

to avoid a potential unmonitored release to the environment

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4
Q

What does the fuel building provide negative pressure to during a SIAS?

A

Auxiliary Building below the 100’ elevation

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5
Q

What is the function of the normal fuel building HVAC?

A

Ensure the operability of Fuel Building equipment
Provide the required ventilation to maintain the level of airborne radioactivity

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6
Q

What is the function of the fuel building essential HVAC?

A

Limit the potential release of radioactive iodine
Function during and after an Safe Shutdown Earthquake
Not allow any single failure in the subsystem to impair the system’s ability to comply with safety design bases one and two

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7
Q

What is the normal op path of the fuel building HVAC?

A

outside air is filtered, adiabatically cooled or heated by ACU then supplied to the different areas of the fuel building

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8
Q

What is the flow path of the NORMAL fuel building exhaust air?

A

Exhaust air is Exhausted by Fans

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9
Q

What is the Fuel Building HVAC line up during a FBEVAS?

A

normal supply AHUs and exhaust Fans are stopped
Fuel Building is automatically isolated by dampers
Air in build exhausted through the Essential AFUs to atmosphere.
Makeup air is drawn in through gaps in the build.

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10
Q

What is the Fuel Build HVAC line up during a SIAS or SIAS/FBEVAS?

A

Essential Exhaust AFUs automatically start
air intake dampers below 100’ Aux Build open
intake air damper from the Fuel Building close
Essential Exhaust AFUs maintain a slightly negative pressure

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11
Q

What takes precedence over a FBEVAS?

A

SIAS

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12
Q

How is the fuel building normal HVAC effected during a SIAS?

A

It is not. It runs normally

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13
Q

What powers the Fuel Building AFU heaters?

A

NG-480 VAC LC

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14
Q

What powers the Fuel Building HVAC system components (fans, pumps, etc.)?

A

NH-480 VAC MCC

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15
Q

What powers Normal Fuel Building duct heater control circuits?

A

NK-125VDC

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16
Q

What powers Essential Fuel Building AFU system components? (Fans, heaters, dampers, etc..)

A

PH- Class 480 MCC

17
Q

What powers safety related dampers in the normal supply lines?

A

PK-Class 125 VDC

18
Q

What is the Essential standby power source for the Fuel Building HVAC system?

A

DG/PE- (PE is the designator for the electrical side of the DG)

19
Q

What CH system tanks vent to the Fuel Building Normal HVAC discharge system?

A

The Refueling Water Tank and CVCS Holdup Tank (HUT)

20
Q

What is the water source for the Fuel Building Normal AHU Air Washer?

A

Domestic Water DS

21
Q

What Appendix R safe shutdown features does Fuel Building HVAC have?

A

Fire dampeners and Essential AFU have water hook-ups to deluge fire extinguishing nozzles in the charcoal bed.

22
Q

What is the safety related function for the fuel building HVAC?

A

It allows exhaust and filtration for aux bldg below 100’

23
Q

What operates the 8 safety-related pneumatically operated isolation dampers?

A

Instrument Air

24
Q

How to we prepare for freezing in the fuel building HVAC system?

A

water supply to the Fuel Building Air Washer is shut off, the Air Washer Water Pump is stopped, and the Air Washer basin is drained.

25
Q

What happens in the Fuel Building when a SIAS occurs?

A

Selected HF fans, dampers are actuated
HF Essential Exhaust AFU fan Starts
HF Essential Exhaust AFU dampers reposition to take suction from the Auxiliary Building below the 100’ elevation

26
Q

What happens in the Fuel Building when a FBEVAS occurs?

A

HF Normal Supply AHU Stops
HF Normal Supply Dampers Close
HF Normal Exhaust Fan Stops
HF Normal Exhaust Dampers Close
HF Essential Exhaust AFU fan Starts
HF Essential Exhaust Dampers align to take suction from the Fuel Building

27
Q

Which radiation monitors are in the fuel building HVAC system upper levels?

A

RU-146

28
Q

Which radiation monitors in the fuel building HVAC can actuate a FBEVAS?

A

RU-31
RU-145

29
Q

Which radiation monitor is in the fuel building vent exhaust?

A

RU-145

30
Q

Which radiation monitor is in the fuel pool area?

A

RU-31

31
Q

What is a FBEVAS?

A

It actuates when there is high radiation levels in the air of the fuel building, ventilation or fuel pool.

32
Q

What is the design of the normal fuel building HVAC?

A

two 50% capacity AHUs
two 50% normal exhaust fans
Normal plant operation, both supply AHUs and both exhaust fans running
Exhaust fans discharge more air than the Supply fans intake

33
Q

What is the line up of the fuel building HVAC dampers?

A

Each exhaust header has a set of two safety-related, Class 1E powered (solenoid actuator), pneumatically operated isolation dampers, in series.

34
Q

Where do the CVCS HUT and RWT vent to?

A

Fuel Building Normal HVAC exhaust

35
Q

What are the ‘A’ and ‘B’ train radiation monitors in the fuel building HVAC system?

A

A- RU31 fuel pool area
B- RU145 fuel building vent exhaust

36
Q

What is the design of the the Essential HVAC exhaust system?

A

Two 100% cap exhaust charcoal filters to min release of radioactive iodine to the environment
Vent to the same outlet of the normal HVAC system
Also connected to the Aux Build ESF Equipment Rooms
Only functions during fuel handling accident, LOCA, or required testing

37
Q

What does each Essential Exhaust AFUs contain?

A
  • Filter Unit Housing
  • Two inlet dampers
  • Heater Element
  • High Efficiency Pre-Filter
  • Upstream High Efficiency Particulate Air (HEPA) Filter
  • Charcoal Adsorber
  • Downstream High Efficiency Particulate Air (HEPA) Filter
  • Exhaust Fan
38
Q

What is imporant about Fuel Building Essential AFU doors?

A

May affect equipment operability
Doors may be opened for a short duration, BUT you must be in communication with the CR to close if needed AND door remains functional

39
Q

What are the lights on the charcoal temperature detection panel?

A

Green-system normal
Yellow-Hi alarm in CR
Red- Hi Hi Alarm in CR
White- detector failure

My NLIT (18 decks)

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