Auxiliary Building (PWR) or Reactor Building (BWR)


The PWR Auxiliary Building (graphic) or BWR Reactor Building is an enclosed reinforced concrete building that houses:

The PWR steel containment is connected to the Auxiliary Building. The Reactor Building surrounds the steel drywell in the case of the BWR design.

Systems and major components usually located in the Auxiliary  Building (PWR) or Reactor Buuilding (BWR) are listed below:

Component Name PWR BWR
Normal Water Makeup and Chemical Purification of Reactor Coolant System Chemical & Volume Control (CVCS) Reactor Water Cleanup (RWCU)
Pumps Charging Pumps (Centrifugal or Positive Displacement) RWCU Pump
Ion Exchangers Cation Exchanger, Deborating Ion Exchanger, Mixed Bed Demineralizer RWCU Ion Exchanger

Heat Exchangers (HX)

Letdown, Seal Water HX RWCU Nongenerative HX

Filters

Letdown, Seal Water Injection, Reactor Coolant RWCU, Seal Water Injection

Tank

Volume Control Tank  
Emergency Core Cooling - High Pressure High Pressure Safety Injection (HPSI) High Pressure Core Spray (HPCS)

Pumps

HPSI Pumps HPCS Pump

Supply Tank

Refueling Water Storage Tank Condensate Storage Tank or Suppression Pool
Emergency Core Cooling - Low Pressure Residual Heat Removal (RHR) or Low Pressure Safety Injection (LPSI) Residual Heat Removal (RHR) or Low Pressure Safety Injection (LPSI) or Low Pressure Core Spray (LPCS)

Pumps

RHR or LPSI Pumps RHR or LPSI or LPCS Pumps

Supply Tank

Refueling Water Storage Tank Condensate Storage Tank or Suppression Pool

Heat Exchangers

RHR HX RHR HX
Emergency Core Cooling - Neutron Poison Boric Acid (BA) Storage and Makeup Standby Liquid Control (SLC)

Pumps

BAST Pumps SLC Pumps

Supply Tank

BA Storage Tank SLC Tank
Containment Spray Containment Spray Drywell Spray / Suppression Pool Spray

Pumps

CS Pumps DW Spray Pumps

Supply Tank

Refueling Water Storage Tank and Caustic Standpipe Condensate Storage Tank or Suppression Pool
Emergency Cooling Component Cooling Reactor Building Closed Cooling
Heat Exchangers    
Pumps    
 Tanks    
Other Systems    

Main Steam

Main Steam Isolation Valves, Safety Valves, Steam Dump Main Steam Isolation Valves and Safety Valves
Ventilation Control Room Control Room
  Auxiliary Building Normal Reactor Building Normal
  Auxiliary Building Special and Shield Building Standby Gas Treatment
Electrical Load Centers 4160, 480 Volt AC 4160, 480 Volt AC
  125 Volt DC 125 Volt DC
Chiller & Chiller Surge Tank Pumps    
Penetration Room    
Hot Machine Shop    
Sampling System Area    
Main feedwater Pipes    
Remote Shutdown Panel Room    
Personnel Hatch (Access to Reactor Containment Building)    

Copyright 1996-2005.  Joseph Gonyeau, P.E.. The Virtual Nuclear Tourist. All rights reserved. Revised: April 24, 2004.