ABVS

Question 1

L/U for building only (ABVS)?

Answer 1

• selected fan (S-31 or S-32) running
• Supplied
  
  • buildings AB
  • CCP 1-3 room
• exh
  
  • ECCS pump rooms
  • buildings AB
  • CCP 1-3
  • CCW pump rooms
• exh - roughing filter (E-2) - x conn to E-1

Question 2

L/U for buildings and safeguards (ABVS)?

Answer 2

both fans (S-31 & S-32) on

• supply
  
  • most buildings
  • eccs pump rooms
  • CCP 1-3 pump room
  • CCW pump room
  • RHR hx room
• exh
  
  • most building
  • eccs pump rooms
  • CCP 1-3 pump room
  • CCW pump room
  • RHR hx
  • CS

through roughing & hepa filters (E-2)

disch (E-1 & E-2) via x-conn

Question 3

L/U for safeguards only (ABVS)?

Answer 3

selected fan (S-31 or S-32)

• supply
  
  • eccs pump room
  • CCP 1-3 pump room
  • CCW pump room
  • RHR hx room
• exh
  
  • eccs pump room
  • rhr hx room
  • CS pump room
  • CCW pump room

through roughing & HEPA filter in E-2

disch selected fan (E-2 or E-1, via x-conn)

Question 4

Difference between buildings & safeguards w/S signal vs. w/o S signal?

Answer 4

S signal

• disch of eccs, CS, ccw, RHR hx room put through charcoal filter and HEPA via E-1
• rest of loads still go through roughing and HEPA on E-2 via E-2 (some bldg, CCP 1-3)

No S signal

• all loads go through roughing and HEPA on E-2 via E-1 & 2(x-conn)

Question 5

Difference between safeguards only w/S signal vs. w/o S signal?

Answer 5

S signal

• all loads go through charcoal filter on E-1, via selected fan

No S signal

• all loads go though roughing and HEPA on E-2 via selected fan

Question 6

What does POV-1 & 2 do?

Answer 6

Provide control logic for FHB and ABVS

Question 7

What does status reset switch do?

Answer 7

Causes logic circuits to reset….. - switch positions - selected equipment - selected mode - current conditions

Question 8

What will fan reset button do if pressed?

Answer 8

All fans will stop Modes will have to be reset (If eccs pump running, fan will not stop and system will op in B & S mode)

Question 9

What will selecting S signal test do if selected? If take switch to reset?

Answer 9

Place ABVS in B & S mode w/ S signal Place ABVS in B & S mode

Question 10

How can you tell if damper or fan out of position per mode?

Answer 10

POV-1 & 2, HMI (VB-4), VB-4 status panel

Question 11

If ABVS in B & S mode…..E-1 trips….what happens?

Answer 11

Shifts to SGO mode

Question 12

If in BO mode what will shift ABVS-> BSG mode? If signal goes away, will ABVS shift back automatically?

Answer 12

• SI signal - any eccs pump starts (RHR, CCP, SI, CS) - manually selected (VB-4) - S signal test switch Yes, to whatever mode is selected

Question 13

Required conditions for supply fan start? What will start non selected fan?

Answer 13

Disch damper open Inlet damper closed Exh fan running Selected fan fails….30 sec low flow

Question 14

What will S/d supply fan in ABVS?

Answer 14

• low flow < 90% ( > 90 sec after start) - loss control power - fan reset ( unless eccs pump on) - disch damper not fully open - exh fan trips …..after 30 sec delay

Question 15

Auto S/d of exh fans in ABVS?

Answer 15

• low flow < 90% (> 90 sec after start) - loss control power - fan reset pushed ( unless eccs pump on) - associated mode dampers not in req positions

Question 16

What is the logic between having some dampeners in parallel vs. series?

Answer 16

Dampeners in series need to close Dampeners in parallel need to open