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Fuel usage (referred to as 'burnup') in a nuclear reactor is generally quoted in units of Megawatt.days per tonne (metric ton = 1000kg). For typical lightwater reactors it is 40,000 MWd/T, after that the fuel is discharged, though it is not possible to ensure that all the fuel reaches this level before discharge. Anyway, taking 40,000 MWd/T as the figure, this means that for 50 kg which is 1/20 of a tonne, the energy produced will be 2,000 MWd. Note this is for typical fuel at about 4 to 5 percent U-235. It is only the U-235 that contributes but the weight of the fuel is taken as the total weight of uranium. The energy figure given is the thermal energy produced by the reactor, not the electrical energy produced which is about 1/3 of this, the rest being rejected to ambient.

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