Auxiliary Building Ventialation(VA)

Question 1

What is the purpose of the Auxiliary Building Ventilation System?

Answer 1

1. Provide a suitable working environment for personnel and equipment. Air exhausted from contaminated and potentially contaminated areas is monitored for radiation and filtered as required prior to release
2. During accident conditions, Auxiliary Building Ventilation aligns to assure that the ECCS pump rooms are maintained at a negative pressure and air exhausted form these rooms is filtered prior to being released

Question 2

How is flow balanced in the system to prevent the spread of contamination?

Answer 2

System flow is balanced to always have the flow from non-contaminated areas to contaminated ares, and then out via the exhaust fans

Question 3

What is the Auxiliary Building Ventilation normal temperature range?

Answer 3

40F - 110F

Question 4

What systems assist in maintaining temperature in the Auxiliary Building Ventilation System?

Answer 4

1. Heating is provided by the Building Heating System(YH) whenever outside air temp is less than or equal to 50F and when AHU intake is less than or equal to 40F
2. Cooling water is provided by the Containment Chilled Water System(YV), and is supplied to control temperature at 60F

Question 5

What is the capacity and power supply to the Auxiliary Building Ventilation System Supply Units?

Answer 5

1. Two 50% capacity supply units
2. Power supplies:
   A. MXW
   B. MXX

Question 6

What will cause an Auxiliary Building Ventilation Supply Unit to automatically start?

Answer 6

With its control switch in “AUTO”, each supply automatically starts as its associated unfiltered exhaust fan starts with a 1 minute TD to allow dampers to reposition

Question 7

What will cause an Auxiliary Building Ventilation Supply unit to trip automatically?

Answer 7

1. Associated Unfiltered exhaust fan shutdown
2. Motor overload
3. Smoke detectors on the outlet of the AHU(trips both supply fans)

Question 8

What is the capacity and power supply to the Auxiliary Building Ventilation System Unfiltered Exhaust Fans?

Answer 8

1. Two, 50% capacity exhaust fans
2. Power supplies:
   A. MXW
   B. MXX

Question 9

Where do the Unfiltered Exhaust Fans discharge to?

Answer 9

The Unit Vent

Question 10

What will cause an Unfiltered Exhaust Fan to automatically start?

Answer 10

VC/YC taken to local(train related)

Question 11

What will cause an Unfiltered Exhaust Fan to automatically stop?

Answer 11

1. EMF-35, EMF-36 trip 2(train related)
2. Safety Injection Signal(train related)
3. Associated filtered exhaust fan shutdown

Question 12

What is the start permissive required to start an Auxiliary Building Ventilation Unfiltered Exhaust Fan?

Answer 12

The Auxiliary Building Ventilation Unfiltered Exhaust fan receives a start permissive from the Auxiliary Building Filtered Exhaust Fan running

Question 13

What is the capacity and power for the Auxiliary Building Ventilation Filtered Exhaust Fans?

Answer 13

1. There are two 50% capacity filtered exhaust fans
2. Power supplies:
   A. EMXG
   B. EMXH

Question 14

Where do the Auxiliary Building Filtered Exhaust Fans discharge to?

Answer 14

The Unit Vent

Question 15

What will cause an Auxiliary Building Ventilation Filtered Exhaust Fan to automatically start?

Answer 15

1. Safety Injection Signal (train related)
2. Blackout (unit and train related)
3. VC/YC to LOCAL(train related)

Question 16

What will cause an Auxiliary Building Ventilation Filtered Exhaust Fan to automatically stop?

Answer 16

1. Motor overload

2. Tornado actuation

Question 17

How many Auxiliary Building Ventilation Filter Units are there, and what is there status during normal operation?

Answer 17

1. There are two filter units, one for each filtered exhaust fan
2. They are normally bypassed

Question 18

What will automatically place the Auxiliary Building Ventilation Filter Units in the filter mode?

Answer 18

1. 0EMF-41 trip 2 (unit and train independent)
2. 1(2)EMF-35 trip 2 (unit related)
3. Safety Injection Signal (train related)

Question 19

What is the purpose of the Auxiliary Building Ventilation Heater Demisters, and when do they operate, and where are they located?

Answer 19

1. The heater demisters extend the life of the charcoal beds by removing moisture
2. The heater demisters energize when the associated filtered exhaust fan is energized and the associated filter unit return damper is open or intermediate
3. The heater demisters are located in the ductwork coming from each ECCS area located upstream of the filter unit

Question 20

What ventilation fans exhaust to the Auxiliary Building Filtered Exhaust Fans suction?

Answer 20

1. Counting Room Supply Filter Unit
2. Counting Room Supply Unit
3. Radwaste Area AHUs
4. Filter and Demineralizer Room Exhaust Unit
5. Aux Shutdown Panel Supply Units
6. Waste and Recycle Evaporator Cooling Units
7. Restricted Instrument Shop Cooling Unit
8. P.D. Pump Room Cooling Unit
9. Main Steam Doghouse Fans and Heaters
10. Aux Building Electrical Penetration Rooms
11. NM Sample Lab

Question 21

What will automatically start the Auxiliary Shutdown Panel Supply Units?

Answer 21

Blackout (unit and train related)

Question 22

What is the affect of a Safety Injection signal of the Auxiliary Shutdown Panel Supply Units?

Answer 22

1. Safety Injection signal will trip the auxiliary shutdown panel air handling units
2. They will be restarted by the load sequencer

Question 23

What is the Auxiliary Building Ventilation System response to placing VC/VY in LOCAL?

Answer 23

• The following is train related*
  1. The Aux Building Filtered Exhaust Fans start
  2. The Aux Building Unfiltered Exhaust Fans start
  3. The Aux Building Supply Units start

Question 24

What is the Auxiliary Building Exhaust Systems response to a Blackout?

Answer 24

• The following is unit and train related*
  1. The Aux Building Filtered Exhaust Fan trips and restarts
  2. Allows a MANUAL start of the Aux Building Unfiltered Exhaust Fans, and that will start the Aux Building Supply Units if they are in AUTO
  3. The Aux Building Unfiltered Exhaust Fan trips
  4. The Aux Shutdown Panel Supply Unit starts

Question 25

What is the Auxiliary Building Ventilation System response to Safety Injection?

Answer 25

* ***The following is train related**** 1. The Aux Building Filtered Exhaust Fans trip and restart 2. Closes isolation dampers to non-safety portions of the VA system so that only ECCS areas are exhausted 3. The Aux Building Unfiltered Exhaust Fans trip, tripping the Aux Building Supply Units 4. VA Filters are shifted to the Filter Mode 4. The Vortex Dampers on the Filtered Exhuast Fan Suction modulate to control flow at 6450scfm, much lower than normal operation ****The following is unit related**** Filter and Demin Room Fans will trip ****The following is unit and train related**** The Aux Shutdown Panel Supply Units trip then restart

Question 26

What is the purpose of the Auxiliary Radwaste Building Area Chilled Water System, and it’s system designator?

Answer 26

1. Consists of two 50% capacity air cooled chillers 2. Radwaste AHUs are supplied by 1 of 2, 100% capacity chilled water pumps 3. Makeup is from YM 4. System designator is YR

Question 27

What is the purpose of the Auxiliary Building Cooling Water System, and what is the system designator?

Answer 27

1. Provides cooling water to NM sample flow heat exchangers and to HVAC equipment in the Auxiliary Building 2. The system designator is - YN

Question 28

What are the loads on the Auxiliary Building Cooling Water System?

Answer 28

1. S/G Blowdown Sample Heat Exchangers 2. Pressurizer Sample Heat Exchanger 3. ND Sample Heat Exchanger 4. NC Hot Leg Sample Heat Exchangers 5. Restricted Instrument Shop Supply Unit 6. Reciprocating Charging Pump Supply Unit 7. Waste Evaporator Package Supply Unit 8. Recycle Evaporator Package Supply Unit 9. NM Sample Coolers

Question 29

How many chillers and chilled water pumps makeup the Auxiliary Building Cooling Water System?

Answer 29

1. There are three YN pumps, 50% capacity each 2. There are three closed circuit evaporative chillers 3. Normal chilled water flow is 250gpm