The results of an investigation of the release of the radioactive fission products 85Kr and 137Cs from dioxide and mononitride nuclear fuel irradiated in the BN-600 and BR-10 fast reactors are presented. The investigation of highly active fuel samples was performed on a remote experimental setup placed in a hot chamber. It is shown that for almost the same annealing temperatures and times of the irradiated samples the release of both fission products – 85Kr and volatile fission product 137Cs – from dioxide fuel is approximately 2 times higher than from mononitride fuel. The 85Kr and 137Cs are released from irradiated uranium dioxide in three thermally activated stages, which for 137Cs are shifted by 89–330°С toward lower temperatures with respect to 85Kr.
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Translated from Atomnaya Énergiya, Vol. 130, No. 2, pp. 74–78, February, 2021.
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Porollo, S.I., Moseev, L.I. & Konobeev, Y.V. Investigation of Fission Product Release from Irradiated Oxide and Nitride Nuclear Fuel on High-Temperature Heating in Helium Flow. At Energy 130, 76–81 (2021). https://doi.org/10.1007/s10512-021-00777-w
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DOI: https://doi.org/10.1007/s10512-021-00777-w