Flashcards in Control Building HVAC Deck (28)
What is the radiation exposure limit that the HJ system is designed to limit?
Exposure in the control room complex to 5 REM whole body or it's equivalent during the duration of the event.
What does the air washer in the OSA AHU do?
Uses a fine spray of water to cool incoming air to both the control room and the control building normal AHUs.
When does the air washer pump start?
When either Normal AHU starts.
Where does makeup for the OSA AHU come from?
DS system water
What areas does the control room normal AHU supply?
120' communications room
140' level (control room complex)
What areas does the control building normal AHU supply?
Throughout the control building
What will start the control room essential AHUs?
To supply conditioned air to the control room complex.
What starts the ESF switchgear essential AHUs?
Furnish air to switchgear rooms, battery rooms, and remote shutdown rooms
What starts the ventilation essential exhaust fans?
SIAS or LOP
What starts the control building normal smoke exhaust fan?
The RO aligns the suction path and starts the fan.
What happens to the control room toilet and kitchen exhaust fans on a LOP, SIAS, CREFAS, or CRVIAS?
Discharge dampers close and fan stays running
What does the SQ system affect in the HJ system?
Rad monitors supply the CREFAS signal on high high radiation levels
What happens to the smoke removal system on a SIAS or LOP?
It is disabled
What interlocks are associated with the Control Room Normal AHU?
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.
What components make up the ESF switchgear Normal AHU?
a cooling coil supplied by WC and a fan. A temperature controller regulates WC flow based on AHU outlet temperature
What will isolate the ESF Switchgear Normal AHU?
SIAS or LOP will close the dampers.
What rooms are supplied by the ESF Switchgear normal AHU?
ESF Switchgear rooms A & B
Remote shutdown rooms
Equipment rooms A-D
Battery rooms A-D
What will start the Control Room Essential AHUs?
sequencer start signal from BOP-ESFAS on:
What rooms are supplied by the ESF Switchgear Room Essential AHUs?
Battery room A&C
ESF Switchgear room A
Battery rooms B&D
ESF Switchgear room B
What will start the ESF switchgear room essential AHUS?
SIAS or LOP
What will start the ESF Equipment room essential AHUs?
SIAS or LOP
What normally supplies conditioned air to the battery rooms?
Control building normal AHU and the ESF Switchgear rooms normal AHU
Why are Normal Exhaust fans supplied for the battery room?
removal of hydrogen to prevent build up
What will cause the battery room normal exhaust fans to stop?
the room's CO2 flood system actuates or a high D/P across the essential exhaust fan is sensed (the fan starts)
What will cause the battery room essential exhaust fans to start?
LOP or SIAS
What will trip the battery room essential exhaust fans?
high D/P in the discharge duct
How many floors of the control building can the Smoke Removal fan be aligned to at a time?
one floor only