Quantitative accuracy analysis of burnup calculations for BNPP fuel assemblies using FFTBM method

A Fast Fourier Transform Based Method (FFTBM) analysis is carried out to determine the accuracy and validation of burnup calculations for Bushehr Nuclear Power Plant (BNPP), with two different codes. WIMSD5 and ORIGEN-2 are used for burnup calculations. Two types of fuel assembly configurations are modeled in evaluating 14 fission products' (FPs) concentrations during 2 and 3 year fuel cycles. The fission products are selected based on their radiological importance in shielding, the energy of gamma radiation, half life, availability of isotope from WIMS and ORIGEN results and their importance in criticality calculations.Despite different approach of burnup calculations by the two codes, FFTBM quantitative analysis showed very good agreement between the results.