Ядерна фізика та енергетика Nuclear Physics and Atomic Energy   ISSN: 1818-331X (Print), 2074-0565 (Online)   Publisher: Institute for Nuclear Research of the National Academy of Sciences of Ukraine   Languages: Ukrainian, English   Periodicity: 4 times per year   Open access peer reviewed journal

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V. L. Dyemokhin, O. V. Gritzenko, V. N. Bukanov, S. M. Pugach

Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, Ukraine

Abstract: To investigate the influence of fissile nuclide concentrations in the core of WWER-1000 type reactor on calculation outcomes of RPV radiation exposure, the series of calculation tests were done. The representation of the neutron spectra parameters was carried out under various approximations of the nuclear fuel burn-up accounting down to pin-to-pin at other things being equal. To define the spectra it was applied a specially designed procedure, where the contributions of various fissile nuclide spectra are determined depending on fuel sorts and burn-up depths. It was shown that neutron spectra change due to burn-up is necessary to account under an assembly approximation to determine the radiation exposure correctly.

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