Power Systems
In a pressurized water reactor

 heavy water is used as both coolant and moderator.
 the coolant water boils in the reactor core.
 water is used at high pressure so that it is available is liquid from at about 280° C.
  both B and C.

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Power Systems
The factor affecting run off are

 amount of vegetation and weather condition in the catchment area.
 the topography and nature of soil in the catchment area.
  all of above.
 rain fall pattern, shape and size of catchment area.

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