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NLO - Systems > HA- Aux. building HVAC > Flashcards

HA- Aux. building HVAC Flashcards

1
Q

What areas are provided with recirculation air handling units the Aux Building?

A

CEDM cabinet room/MG set room

Charging Pump rooms

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2
Q

Areas below what level in the Aux Building are isolated from the normal HVAC system on a receipt of a SIAS?

A

100’

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3
Q

What system provides cooling to the HA Essential System ACUs?

A

Essential Chilled Water

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4
Q

How does HA and EW interact?

A

EW provides start/stop signals to HA ACUs when the EW pump is started/stopped
HA ACUs provide cooling and ventilation in the rooms in which EW system pumps are located

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5
Q

What system provides the motive force for various HA dampers?

A

Instrument Air

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6
Q

What components of the HA system are powered by NG?

A

Aux Building AHU Outside Air Heater, Access Control Area Normal AHU heating coil

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7
Q

During normal operations, what is the status of the HA Essential HVAC room coolers?

A

Standby

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8
Q

What maintains the lower levels of the Aux Building under a slight negative pressure after a SIAS?

A

Fuel Building/Aux Building Exhaust Essential AFUs

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9
Q

What is the capacity of the HA Outside Air Normal Supply AHUs?

A

50% each

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10
Q

Which Units have had its ‘A’ HA Outside Air Normal Supply AHU OIC replaced with filter media? Which AHUs still have the oil impingement cleaners?

A

Unit 1 and 2 ‘A’ units have filter media

all others have OIC

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11
Q

What is the purpose of the electric timer utilized in the OIC on the OSA Normal AHUs in the aux. building?

A

Controls a motor which intermittently rotates the filtering curtain through an oil bath

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12
Q

What situation would have us bypass the HA OSA normal AHU OIC timer and where can this switch be operated?

A

High dust loading conditions

operated from the control room

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13
Q

What provides cooling to the HA Outside Air Normal Supply AHUs?

A

Normal Chilled Water

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14
Q

What is the purpose of the HA Outside Air Normal Supply AHU interlock?

A

To ensure that the number of running AHUs are equal to or less than the number of running exhaust normal AFUs, which will maintain the Aux Building at a slightly negative pressure

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15
Q

What could be an adverse effect of air flow imbalances?

A

Fire dampers not being able to close in response to an actuation

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16
Q

Concerning the Access Control Area Ventilation system, what is meant by a dual duct AHU?

A

It takes suction from a single supply duct and distributes air to two distribution ducts

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17
Q

What provides the necessary heating for the hot duct in the Access Control Area Ventilation system?

A

Electric heating coil located in parallel with the cooling coil within the AHU

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18
Q

In regards to the Access Control Area Ventilation system, what provides the cooling water through the coil? What does the system provide conditioned air for?

A

Normal Chilled Water

RP island, labs, and RP locker rooms

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19
Q

What prevents Access Control Area Ventilation system normal heater operation when the AHU fan is not in operation?

A

A flow switch

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20
Q

What is the purpose of the mixing boxes in the Access Control Area Ventilation system? How many zones are associated with the system?

A

Controls air temperature by using pneumatic dampers to control air volume from the hot duct, cold duct air flow is not modulated and is full open

7 zones

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21
Q

How many Charging Pump Room Normal ACUs are there? What controls cooling flow through the unit?

A

Three ACUs (one per room)

auto flow regulating valve

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22
Q

When do the Charging Pump Room Normal ACUs start and stop?

A

On a receipt of a pump running signal

When the signal clears, a time delay actuates and maintains the ACU running for 5 minutes

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23
Q

What is the capacity of the CEDMCS Room Normal ACUs and what do they cool?

A

Two 100% capacity redundant ACUs

circulate air in the CEDM cabinet and MG Set rooms

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24
Q

How are the normal ACUs for the CEDM cabinet and MG set rooms operated? When are they normally in operation?

A

Manually operated by a local hand switches near the ACUs (120’ aux building)

Whenever the CEA drive mechanisms are energized

25
Q

What is the purpose of the Fume Hood Normal Exhaust Fans?

A

Provide a positive means of exhausting air from areas where chemicals are used or potential radioactive gasses may be present

26
Q

What are the various Fume Hood Normal Exhaust fans and where are they located?

A

2 Hot Lab
1 Cold lab
1 A. A. Spectrophotometer
1 Sample Room

All on the 140’ of the Aux Building

27
Q

What is the capacity of the HA Normal Exhaust AFUs? What do they consist of?

A

Two 50% capacity units

30 high efficiency filters
2 banks of 30 HEPA filters
charcoal filter
30k cfm fan

28
Q

What is the fan rated for in the HA Normal Exhaust Air Filtration unit? Where does it exhaust to?

A

30,000 cfm

plant vent

29
Q

When are the D/P detectors that monitor HA AFU filters set to alarm on High D/P?

A

8.2” H2O

30
Q

What happens if HA AFU filter D/P lowers to 1.5” H20?

A

Trips the opposite supply fan to ensure that the number of running supply fans do not exceed the number of running exhaust fans

31
Q

Concerning the HA AFU filters, what could be caused by a perceptible drop in D/P?

A

Damage to or deterioration of filter media or gaskets

32
Q

Concerning the HA AFUs, why is there a high temperature control assembly mounted downstream of the carbon adsorber?

A

Monitors the air temperature as it leaves the adsorber, alarming and illuminating a local yellow light when the airstream reaches 265F

At 310F a local red detection alarm is indicated

Should the thermistor cable be damaged, the device also provides a fault alarm and a local white light

33
Q

What is the purpose of the water deluge system in the adsorber section of the HA AFU?

A

Connected to the Fire Protection system water supply of 100 psig in case of excessive adsorber temperature
Saturates the carbon in 3.5 minutes

34
Q

What happens when water is applied to activated carbon filters?

A

Will cause all adsorbed materials to be released

35
Q

When would I ever connect the water deluge system in the aux building HVAC system?

A

Excessive temperature levels to prevent reaching the ignition point of activated charcoal of 625F

36
Q

What is the purpose of the HA normal exhaust AFU adsorber’s eight sample canisters?

A

They see the same air flow as the main beds, so we can test these canisters to determine the remaining adsorbency

37
Q

When you start the Aux Building Normal Exhaust fan, what else occurs?

A

Also opens the Exhaust unit inlet damper and allows the associated suction damper to modulate open to control the negative pressure in the Aux Building

38
Q

Why is the AFU fan’s suction damper limited to 60,000 cfm?

A

Prevent damage to the filters

39
Q

What essential ACUs are part of the HA system?

A

HPSI Pump Room, LPSI Pump Room, CS Pump Room, EW Pump Room, AF Pump Rooms, and ESF Electrical Penetration Rooms

40
Q

What happens with the ESF Electrical Penetration Room ACUs when a SIAS or LOP is generated?

A

ACUs will auto start and have to be manually secured at their MCC after the SIAS or LOP are secured

41
Q

How long after the supply valves go closed will the Aux Feedwater Pump AHUs auto stop?

A

5 minutes

42
Q

Where can the Aux Feedwater Pump AHU be started manually? How can the fans be stopped?

A

At the associated MCC breakers

If started manually, the fans will have to be stopped manually

43
Q

All Auxiliary Building ACUs have a Temperature Switch High Alarm set at what value? Basis?

A

101F, it is an early warning of excessive room temperature rise

44
Q

What is the maximum room temperature of all aux. building rooms?

A

120F

45
Q

If a high temperature for AFP ‘A’ is due to a steam leak, what actions must be taken?

A

AFP ‘A’ room must be isolated from Room B within 1 hour to prevent degradation of both trains of aux feed due to high temperature

46
Q

If any of the Essential ACUs lose an individual room cooler, it will make that rooms equipment inoperable. How long do I have to restore it?

A

72 hours

47
Q

What does RU-8 monitor? (140’ East Pen)

A

The Exhaust duct for radiation before the air is treated in the normal exhaust AFUs

48
Q

What does RU-9 monitor? (100’ East End)

A

Exhaust flow from the 100’ level and below, which helps us to detect leakage associated with various systems

49
Q

What does RU-10 monitor? (120’ East End)

A

Monitors 120’ and above, which helps us to detect leakage associated with various auxiliary systems

50
Q

How does HF interact with HA during a SIAS?

A

Upon a receipt of a SIAS, Essential HA system supply and exhaust dampers shut, isolating the Aux Building below the 100’ level, thus permitting exhaust into the fuel building via an interconnecting tunnel

Additionally, HF Essential AFUs fuel building inlet dampers close and the auxiliary building dampers open to align the fuel building essential AFUs to receive Aux Building Exhaust

51
Q

How is HA affected by a loss of Instrument Air?

A

Normal AHUs discharge dampers fail close, causing the AHU fans to be dead-headed (Room temps will start to elevate due to no supply air)

Exhaust Normal AFU dampers on the suction side fail closed, causing the AFUs to run with a closed suction path that will cause the associated AHU to trip on low DP across the AFU

Access Control area AHU continues to run, taking suction on the HA supply header and may result in contamination of the 140’ spaces supplied by this AHU.

Hot air to the mixing boxes is stopped, causing the discharge to be in full cooling mode

WC flow to the charging pump room ACUs fails open

52
Q

How is HA affected by a loss of Class 125 VDC?

A

HA system pump room supply and exhaust isolation dampers

-Isolation dampers that isolate below 100’ level of the Aux Building will fail closed

53
Q

What is the purpose of the aux. building HVAC system?

A

ventilate and control the release of airborne radioactivity from the aux. building during normal plant operation

maintain the required thermal environment for the ESF equipment rooms during emergency situations

control the release of the airborne radioactivity caused by leakage from an area below the 100’ of the aux. building post LOCA

54
Q

What does the HA system provide in the case a High Energy Line Break (HELB) occurs?

A

atmospheric vent path through the exhaust duct to the plant vent stack

55
Q

When does the steam driven Aux feedwater pump AHU auto start? When will it stop?

A

when either of the two steam supply valves go open

5 minutes after both steam supply valves are closed

56
Q

In the HA system, what is powered by NH?

A

non class fan motors, space heaters and fume exhaust fans

57
Q

How is the HA system affected by a loss of the NK system?

A

HA normal AHU discharge dampers and normal AFU suction dampers are lost due to NK powering solenoids

58
Q

How does the HA system interface with WC?

A

cooling water to the normal HA AHUs, access control ACU, CEDMCS room ACUs and charging pump room ACUs

NLO - Systems (70 decks)

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