Power Systems
A sodium graphite reactors use

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

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Power Systems
In a pressurized water reactor

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

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