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.

报告了在BN-600的10个实验FA中辐照至最大燃耗7.5％ha后从混合氮化物燃料释放裂变气体的研究结果。结果表明，气体释放从燃耗> 2％ha开始，并随着燃耗的增加而增加。混合和氮化铀燃料的气体释放对燃耗的依赖性非常吻合。燃料棒包壳下方的裂变气体由三个基本成分组成：氙，氦和k。剩余气体（N ₂，Ar，O ₂，CO _2）的含量）不超过百分之一的十分之一。氙具有最高的比释放，其次是氦和and。氦气具有最高的相对释放率（> 40％）。对于大多数研究的燃料棒，氙气和k气具有几乎相同的释放率，但不超过20％。裂变气体的更高释放与燃料温度的升高（> 1500°C）或燃料微结构的特征有关。