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What is the difference between burnup and depletion calculations?

  1. Mar 7, 2008 #1
    What is the difference between burnup calculations and depletion calculations?
  2. jcsd
  3. Mar 7, 2008 #2


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    Staff: Mentor

    They are the same. Burnup refers to the energy produced per unit mass of fuel, usually in MWd/kgU or GWd/tU, although the Canadians like to use MWh/kgU, the Belgians and some others used to use MWd/kgUO2[/sup], and for a long time GE (GNF) used GWd/stU (st = short ton). In MOX cores, the burnup may expressed in GWd/tHM (HM=Heavy Metal, U+Pu). Finally some folks used FIMA, or fissions per initial metal atom, with a rough equivalence of 1% FIMA = 9.75 GWd/tU.

    The term depletion refers to the reduction or depletion of enrichment of the fuel. When fuel is irradiated, most of the fission event occur in U-235 until sufficient Pu-239/Pu-240/Pu-241 build up to compete with the U-235 for neutrons.

    Using a code like SIMULATE, one does core depletion calculations which basic simulate the fission process in the core during a cycle of operation.
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