Reactor Building - CANDU Reactor 

This model illustrates the internal structure of the Canadian CANDU reactor design. The Reactor, or Calandria, is mounted horizontally. The horizontal tubes contain either Fuel or Reactor Coolant Water. Heavy water, or deuterated water,  is circulated through the reactor for removing heat. Heavy water is also located around the tubes and within the shell area of the calandria. The heavy water is used as a moderator, which causes the neutrons released from the fuel during the fission process to lose their energy.

Reactor coolant or recirculation pumps are used to circulate the water through the reactor to remove the heat. 

The water is directed to the Steam Generators where the water passes on the inside of tubes. Water passing on the outside of the tubes in the steam generator is heated to steam. This steam then passes to the turbine.

More on CANDU reactors....

Copyright 1996-2004.  Joseph Gonyeau, P.E.. The Virtual Nuclear Tourist. All rights reserved. Revised: March 15, 2001.