Power Systems
In which power plant, the thermal efficiency is quite low

  Hydro power plant.
  Steam power plant.
  Nuclear power plant.
  Diesel power plant.

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Power Systems
In boiler water reactor (BWR)

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

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