Power Systems
In a pressurized water reactor

 heavy water is used as both coolant and moderator.
  both B and C.
 the coolant water boils in the reactor core.
 water is used at high pressure so that it is available is liquid from at about 280° C.

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Power Systems
Gas coolled reactor

  both B and C.
 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.
 use heavy water as coolant as well as moderator.

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