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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Power Systems
In boiler water reactor (BWR)

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

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