Power Systems
The essential requirement(s) for power plants to be operated as peak load plants are

 Quick response to load variation.
 Low capital cost.
All of these
 Capability of quick starts.

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Power Systems
In a pressurized water reactor

 heavy water is used as both coolant and moderator.
  both B and C.
 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.

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