FHBV

Question 1

Describe basic lineup and description of FHBV

Answer 1

Two supply fans, one running, one stby (S-1, S-2)

mode dampers

loads

three exhaust fans, E-4 normally running (no charcoal filter)

E-5 and 6 iodine removal fans (have charcoal filters)

all exhaust fans have roughing and hepa filters

Question 2

what will happen to FHBV if RE-58 or 59 alarm on Hi Radiation?

Answer 2

E-4 will shutdown

E-5 or 6 will start (whichever one is selected)

Mode dampers will reposition

Question 3

What are the different ways to put FHBV in iodine removal mode?

Answer 3

select iodine removal mode on VB-4

Hi-Rad on RE-58 or 59

depress iodine removal mode pushbutton on SFP deck

Question 4

what is the apppximate flowrate of the FHBV supply fans when compared to the exhaust fans? Why?

Answer 4

supply ~ 23,000 cfm

exhuast ~ 35,000cfm

normally one of each running, keeping a negative pressure on FHB

Question 5

FHBV supply fan trips

FHBV exhaust fan trips

Answer 5

Supply

• flow < 90%
• loss control power to POV (125 vdc)
• fan reset pushed
• no exhaust fan running
• mode damper not fully open

exhaust

• flow < 90%
• loss control power to POV (125 vdc)
• fan reset pushed
• mode damper not fully open
• normal mode (E-5 or 6)
• iodine mode (E-4)

Question 6

Power Supplies to FHBV fans

Answer 6

S-1 G (ghost)

S-2 H (house)

E-4 (non-vit, 12N)

E-5 F (freaky)

E-6 H (hallway)