The research of burnable absorber (BA) is a very important issue, due to BA influence on regulation and control of reactivity in the reactor. Burnable absorbers compensate initial excess reactivity in the reactor and thus allow longer fuel cycle with higher fuel enrichment. This paper deals with the depletion calculation of Evolutionary Power Reactor (EPR) nuclear fuel with different types of BA, and with optimization of the BA. The main objective of this paper is to calculate burnable absorber composed of 2 elements. The distribution of BA in the fuel is here assumed uniform. Based on depletion calculation, elements are divided into two groups, fast and slow BAs. Several combinations of two BA elements are then calculated based on this division. The evaluation of each BA combination is made, and the most appropriate one is selected.

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