Power Systems
In boiler water reactor (BWR)

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

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Power Systems
A CANDU reactor uses

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

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