Calculation of Isotope Composition of WWER- 440 Spent Fuel Assembly by the NESSEL-NUKO Code System on the Basis of the ISTS Burn-Up Credit Project Data

R. Prodanova / INRNE / Bulgaria (paper only)

16th Symposium of AER on VVER Reactor Physics and Reactor Safety (2006, Bratislava, Slovakia)
Physical Problems of Spent Fuel Decommissioning and Radwaste


Aiming at validation of depletion codes against WWER-440 spent fuel data some calculations of isotope composition of WWER-440 spent fuel assembly have been carried out by the NESSEL-NUKO code system. The initial data and data for the comparisons were taken from the ISTS burn up credit project data, recently published in the ISTC report ”Radiochemical Assays of Irradiated WWER-440 Fuel for Use in Spent Fuel Burnup Credit Activities.
The specific work scope included the destructive assay (DA) of spent fuel assembly rod segments with an ~38.5 MWd/KgU burn up from a single WWER-440 fuel assembly from the Novovorenezh reactor in Russia.

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