Power Systems
The load current in short circuit calculations are neglected because

 short circuit currents are greatly out of phase with load currents
 short circuit currents are much larger than load currents
 both 1 and 2
 nether 1 nor 2

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Power Systems
In a pressurized water reactor

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

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