Power Systems
An impulse turbine

 always operates submerged.
  operates by initial complete conversion to kinetic energy.
 makes use of a draft tube.
 is most suited for low head and high discharge power plants.

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Power Systems
A CANDU reactor uses

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

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