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In nuclear power technology, burnup is a measure of how much energy is extracted from a given amount of nuclear fuel[1]. It may be measured as the fraction of fuel atoms that underwent fission in %FIMA (fissions per initial heavy metal atom)[2] or %FIFA (fissions per initial fissile atom)[3] as well as the actual energy released per mass of initial fuel in gigawatt-days/metric ton of heavy metal (GWd/tHM), or similar units. The amount of initial fuel in the denominator is defined as all uranium, plutonium, and thorium isotopes, not including alloying or other chemical compounds or mixtures in the fuel charge[1].