HJ-Control building HVAC

Question 1

What is the purpose of the HJ system?

Answer 1

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 2

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

Answer 2

5 Rem

Question 3

How does HJ supports operations during a Station Blackout?

Answer 3

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

Question 4

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

Answer 4

Air Handling Equipment Rooms A and B

Question 5

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

Answer 5

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

Question 6

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

Answer 6

Lower Cable Spreading Room
Inverter Room and Communication Equipment room
Corridor

Question 7

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

Answer 7

Upper Cable Spreading Room
Microwave Room
Lobby

Question 8

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

Answer 8

Domestic Water

air washer pump

Question 9

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

Answer 9

74’ level Control Building

Question 10

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

Answer 10

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 11

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

Answer 11

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

74’ control building

Question 12

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

Answer 12

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

Question 13

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

Answer 13

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

74’ control building

Question 14

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

Answer 14

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

Question 15

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

Answer 15

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

Question 16

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

Answer 16

SIAS or LOP

high D/P

Question 17

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 17

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

locally

Question 18

What does WC do for HJ?

Answer 18

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

Question 19

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

Answer 19

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

Question 20

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

Answer 20

SIAS, LOP, CREFAS or CRVIAS

Question 21

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

Answer 21

120’, 140’

Question 22

When would the Battery Room Normal Exhaust fans auto stop?

Answer 22

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 23

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

Answer 23

Align a suction path

Question 24

How many levels can I align the Smoke Removal to?

Answer 24

One at a time

Question 25

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

Answer 25

140’

Question 26

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

Answer 26

100’

Question 27

What does EC do for the HJ system?

Answer 27

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

Question 28

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

Answer 28

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

Question 29

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

Answer 29

outside air intake plenum

Question 30

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

Answer 30

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