The results of an investigation of fission gas release from mixed nitride fuel after irradiation to maximum burnup 7.5% h. a. in 10 experimental FA in BN-600 are reported. It is shown that gas release commences at burnup >2% h.a. and increases with increasing burnup. The burnup dependence of gas release for mixed and uranium nitride fuel coincide quite well. The fission gas beneath the fuel-rod cladding consists of three basic components: xenon, helium, and krypton. The content of the remaining gases (N2, Ar, O2, CO2) does not exceed tenths of a percent. Xenon has the highest specific release, followed by helium and krypton. Helium has the highest relative release (>40%). Xenon and krypton have almost identical release not exceeding 20% for most of the investigated fuel rods. A higher release of fission gas is associated with either an increase of the fuel temperature (>1500°C) or features of fuel microstructure.
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Translated from Atomnaya Énergiya, Vol. 129, No. 2, pp. 111–114, August, 2020.
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Grachev, A.F., Zabud’ko, L.M., Skupov, M.V. et al. Fission Gas Release from Irradiated Uranium-Plutonium Nitride Fuel. At Energy 129, 103–107 (2020). https://doi.org/10.1007/s10512-021-00712-z
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DOI: https://doi.org/10.1007/s10512-021-00712-z