Power Systems
Gas coolled reactor

 use CO2. or helium as coolant and graphite the moderator.
 use coolant at pressure of 14-28 Kg/cm2 and at temperature of 700°-800° c.
  both B and C.
 use heavy water as coolant as well as moderator.

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Power Systems
A CANDU reactor uses

 only fertile materials.
 enriched uranium as fuel and ordinary water as moderator and cooler.
 highly enriched uranium as fuel and water as moderator and coolant.
  natural uranium as fuel and heavy water as moderator and coolant.

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