HJ-Control building HVAC

Question 1

To what level of radiation exposure does the HJ system limit personnel to during an event?

Answer 1

5 Rem

Question 2

What rooms does the HJ AHU supply on the 120’ level?

Answer 2

Lower Cable Spreading Room
Inverter Room and Communication Equipment room
Corridor

Question 3

When would the Battery Ventilation Essential Exhaust Fans be used? What trips them?

Answer 3

SIAS or LOP

high D/P

Question 4

Why are there isolation dampers installed in the control building normal ventilation system?

Answer 4

it shares the ductwork with the control building essential units so the dampers isolate the normal and essential units from each other

Question 5

How does HJ supports operations during a Station Blackout?

Answer 5

Provides environment to support equipment operation during the 16 hour coping period following a Station Blackout

Question 6

What rooms does the HJ AHU supply on the 160’ level?

Answer 6

Upper Cable Spreading Room
Microwave Room
Lobby

Question 7

During smoke removal in the control building, where is fresh air drawn in form?

Answer 7

outside air intake plenum

Question 8

What rooms does the HJ AHU supply on the 100’ level?

Answer 8

Train A and B Switchgear Rooms
Class A, B, C, D battery rooms
Remote Shutdown Rooms

Question 9

A LOP or SIAS signal will prevent smoke removal from what level?

Answer 9

100’

Question 10

When would the Control Room Essential AHU be used? Where is it located?

Answer 10

Starts on a SIAS, CSAS, CRVIAS, CREFAS or LOP

74’ control building

Question 11

What is the interlock associated with starting the Control Room Normal AHU?

Answer 11

Will not start unless both discharge dampers are open. A closure of either damper will trip the AHU

Question 12

Where are the HJ Outside Air Normal AHU and Air washer pump located?

Answer 12

74’ level Control Building

Question 13

What would cause the Control Room Normal AHU isolation dampers to close?

Answer 13

SIAS, LOP, CREFAS or CRVIAS

Question 14

What system provides the makeup water for HJ Normal OSA AHU air washer? What provides the spray motive force?

Answer 14

Domestic Water

air washer pump

Question 15

Why are the fire dampers in the class switchgear and battery rooms interlocked with the fire protection system?

Answer 15

if a CO2 discharge takes place, fire dampers are prevented from closing for 3.5 minutes to avoid over pressurization

Question 16

What must be done prior to start the Smoke Removal fan?

Answer 16

Align a suction path

Question 17

What two elevations does the Control Room Normal AHU supply to?

Answer 17

120’, 140’

Question 18

Where does the Control Building AHU take suction from? Where is it located?

Answer 18

The Control Building normal return duct and the outlet of the Control Building OSA Normal AHU

74’ control building

Question 19

What does WC do for HJ?

Answer 19

Provides chilled water for control room normal, control building normal and ESF switch gear room normal (both trains) cooling coils

Question 20

When would the ESF Equipment Room Essential AHU be used and where does it send air to?

Answer 20

SIAS or LOP, will send conditioned air to the DC equipment, ESF switchgear rooms

Question 21

A LOP, SIAS, CRVIAS or CREFAS signal will prevent smoke removal of what level?

Answer 21

140’

Question 22

What does EC do for the HJ system?

Answer 22

chilled water for switch gear and equipment room essential train A and B AHU cooling coils

Question 23

When would the discharge dampers of the Control Room Toilet and Control Room Kitchen Exhaust get isolated? Where are the hand switches controlled from?

Answer 23

Upon a LOP, SIAS, CREFAS, or CRVIAS
Fan will stay running

locally

Question 24

When would the ESF Switchgear Room Essential AHUs be used and where do they send air to?

Answer 24

SIAS or LOP, will send conditioned air to the ESF switchgear rooms, battery rooms, and remote shutdown rooms

Question 25

What rooms does the HJ AHU supply on the 74’ level?

Answer 25

Air Handling Equipment Rooms A and B

Question 26

What is the purpose of the HJ system?

Answer 26

Provides the required environment for personnel occupancy and equipment operation in the Control Building, including the Control and Computer Rooms during normal and emergency plant operation

Also responsible for isolating the Control Room against intrusion of poisonous gases, smoke or airborne radioactivity from the outside

Question 27

When would the Battery Room Normal Exhaust fans auto stop?

Answer 27

When its respective room CO2 flood system actuates or the associated Essential Exhaust fan starts (Sensed by a high D/P across the Essential Fan)

Question 28

Where does the Control Room Normal AHU take suction from and where does it discharge to?

Answer 28

From an intake plenum being fed from:

120’ Communications Room and Inverter Room
140’ level
Control building OSA Normal AHU

Discharges back to the Control Room Complex, Comms Room, and Inverter Room

Question 29

What is the purpose of the ESF Switchgear Room Normal AHU?

Answer 29

Assists the Control Building Normal AHU in cooling the DC equipment and ESF Switchgear rooms

Question 30

How many levels can I align the Smoke Removal to?

Answer 30

One at a time