Power Systems
Gas coolled reactor

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

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Power Systems
A sodium graphite reactors use

  sodium as coolant and graphite as moderator.
 sodium as moderator and graphite as coolant.
 a mixture of sodium and graphite as coolant.
 a mixture of sodium and graphite as moderator.

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Power Systems
In boiler water reactor (BWR)

 enriched uranium is used as fuel.
 there is danger of radioactive contamination of steam.
  all of above.
 the feed water acts both coolant and a moderator.

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