Power Systems
The function of moderator in a nuclear reactor is

 to increase the energy of the neutrons.
All of these
  to slow down the neutrons.
 to absorb the excess.

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Power Systems
In boiler water reactor (BWR)

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

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