Control Building HVAC

Question 0

What does the air washer in the OSA AHU do?

Answer 0

Uses a fine spray of water to cool incoming air to both the control room and the control building normal AHUs.

Question 1

What is the radiation exposure limit that the HJ system is designed to limit?

Answer 1

Exposure in the control room complex to 5 REM whole body or it’s equivalent during the duration of the event.

Question 2

When does the air washer pump start?

Answer 2

When either Normal AHU starts.

Question 3

Where does makeup for the OSA AHU come from?

Answer 3

DS system water

Question 4

What areas does the control room normal AHU supply?

Answer 4

120’ communications room
Inverter room
140’ level (control room complex)

Question 5

What areas does the control building normal AHU supply?

Answer 5

Throughout the control building
Communications room
Inverter room

Question 6

What will start the control room essential AHUs?

Answer 6

SIAS
CSAS
CRVIAS
CREFAS
LOP
To supply conditioned air to the control room complex.

Question 7

What starts the ESF switchgear essential AHUs?

Answer 7

SIAS
LOP

Furnish air to switchgear rooms, battery rooms, and remote shutdown rooms

Question 8

What starts the ventilation essential exhaust fans?

Answer 8

SIAS or LOP

Question 9

What starts the control building normal smoke exhaust fan?

Answer 9

The RO aligns the suction path and starts the fan.

Question 10

What happens to the control room toilet and kitchen exhaust fans on a LOP, SIAS, CREFAS, or CRVIAS?

Answer 10

Discharge dampers close and fan stays running

Question 11

What does the SQ system affect in the HJ system?

Answer 11

Rad monitors supply the CREFAS signal on high high radiation levels

Question 12

What happens to the smoke removal system on a SIAS or LOP?

Answer 12

It is disabled

Question 13

What interlocks are associated with the Control Room Normal AHU?

Answer 13

the ahu won’t start unless both discharge dampers are open and if either damper closes, the ahu will trip.
The dampers closing on the SIAS, LOP, CREFAS, or CRVIAS are what trips the AHU.

Question 14

What components make up the ESF switchgear Normal AHU?

Answer 14

a cooling coil supplied by WC and a fan. A temperature controller regulates WC flow based on AHU outlet temperature

Question 15

What will isolate the ESF Switchgear Normal AHU?

Answer 15

SIAS or LOP will close the dampers.

Question 16

What rooms are supplied by the ESF Switchgear normal AHU?

Answer 16

ESF Switchgear rooms A & B
Remote shutdown rooms
Equipment rooms A-D
Battery rooms A-D

Question 17

What will start the Control Room Essential AHUs?

Answer 17

sequencer start signal from BOP-ESFAS on:
SIAS/CSAS
CREFAS
CRVIAS
LOP

Question 18

What rooms are supplied by the ESF Switchgear Room Essential AHUs?

Answer 18

Battery room A&C
ESF Switchgear room A
Battery rooms B&D
ESF Switchgear room B

Question 19

What will start the ESF switchgear room essential AHUS?

Answer 19

SIAS or LOP

Question 20

What will start the ESF Equipment room essential AHUs?

Answer 20

SIAS or LOP

Question 21

What normally supplies conditioned air to the battery rooms?

Answer 21

Control building normal AHU and the ESF Switchgear rooms normal AHU

Question 22

Why are Normal Exhaust fans supplied for the battery room?

Answer 22

removal of hydrogen to prevent build up

Question 23

What will cause the battery room normal exhaust fans to stop?

Answer 23

the room’s CO2 flood system actuates or a high D/P across the essential exhaust fan is sensed (the fan starts)

Question 24

What will cause the battery room essential exhaust fans to start?

Answer 24

LOP or SIAS

Question 25

What will trip the battery room essential exhaust fans?

Answer 25

high D/P in the discharge duct

Question 26

How many floors of the control building can the Smoke Removal fan be aligned to at a time?

Answer 26

one floor only

Question 27

Can smoke be removed from the control room on a LOP, SIAS, CREVIAS, or CREFAS?

Answer 27

no. ducts isolate the control room and won’t allow for smoke removal.
LOP or SIAS also isolates the 100ft of the control building from smoke removal.