Ø            Light Water Graphite Moderated Reactor

In a light water graphite moderated reactor, enriched nuclear fuel undergoes nuclear fission inside a bundle of pressure tubes containing light water for cooling.  The tube bundle is placed inside a graphite structure which provides moderation.  The water which has cooled the nuclear fuel is collected in steam drums, to produce steam for the turbine-generator.  The nuclear fuel in a pressure tube can be replaced when the reactor is operating.