Aside from the above situations, thermal efficiency makes up the bulk of the difference in operational efficiiency. How much heat needs to be discharged into the environment vs. how much can be used by the plant is usually a matter of operating temperature in the steam generators. In a coal or gas fired plant, the internal boilers may be run at a higher temperature than plants containing precisely engineered nuclear fuel assemblies which could be damaged by excess heat. This consideration will be taken into advisement at the time of designing such power plants so that the most optimal conditions are present for the most efficient running of the plant during normal operations.
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