Power Systems
A CANDU reactor uses

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

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Power Systems
A thermal power station needs space

 less than that required by a gas turbine power plant of same output.
 less than that required by the diesel power station of same output.
 less than that required by atomic power station of the same output.
  less than that required by hydro-power station of same capacity.

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