A BURNUP CREDIT CALCULATION METHODOLOGY FOR PWR SPENT FUEL TRANSPORTATION

A bumup credit calculation methodology for PWR spent fuel transportation has been developed and validated in CEA/Saclay. To perform the calculation, the spent fuel compositions are first determined by the PEPIN-2 depletion analysis. Secondly the most important actinides and fission product poisons are automatically selected in PEPIN-2 according to the reactivity worth and the bumup for criticality consideration. Then the 30 Monte Carlo criticality code TRIMARAN-2 is used to examine the subcriticality. All the resonance self-shielded cross sections used in this calculation system are prepared with the APOLL0-2 lattice cell code. The bumup credit calculation methodology and related PWR spent fuel transportation benchmark results are reported and discussed.