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A nuclear-power station with a life of 25 yr produces 750 MW/yr as useful energy.The energy cost is as follows: 150 MW lost in distribution 20 MW needed to mine

the fuel 50 MW needed to enrich the fuel 80 MW (spread over 25 yr) to build the plant 290 MW lost as heat What is the efficiency of the plant? What is the efficiency of the system (including distribution losses)?

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