What is the thermal efficiency of the nuclear process for generating electricity and how does it matter?

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The new General Electric 9H and the Siemens competitive equivalent gas turbines are claiming a 60% efficiency by using combined gas and steam generation to scavenge as much energy as possible from the input gas.
Similar figures might be obtained from closed cycle gas nuclear systems, but to date have not been recorded. Work with 35% to 45% at the moment.

It is important in that much of the energy in a generating station is wasted, and simply heats up the local atmosphere. There is a financial cost, and with conventionally fuelled power stations, a big pollution cost. Nuclear stations are much cleaner.
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