The neutronic properties of UO₂-BeO fuel with various claddings are investigated through the Monte Carlo method and the Linear Reactivity Model. A second order polynomial function is suggested to describe the relationship between the difference of the reactivity at the End of Cycle and two factors, the uranium enrichment and the volume fraction of BeO in the UO₂-BeO fuel. The uranium enrichment is determined to ensure the same cycle length for each BeO fraction with zircaloy, FeCrAl, and SiC claddings. Similar neutronic properties are observed between the zircaloy and SiC claddings for a given BeO fraction, including the infinite multiplication factor, the gas release, the power distribution, and the isotopic concentrations. An important feature of UO₂-BeO fuel is the production of ⁴He, which is significant compared with current UO₂ fuel. Lower production rates of xenon and krypton are found in the case of the UO₂-BeO-FeCrAl fuel-cladding system, while those in the UO₂-BeO-zircaloy and UO₂-BeO-SiC systems are quite similar to the current UO₂-zircaloy system. The power distribution in an assembly and in a fuel pellet is flatter for a higher BeO fraction with the same cladding. Higher peak power is found in fuel assemblies with FeCrAl compared to the other two claddings, while the radial power distribution is quite similar for the three claddings.

通过蒙特卡罗方法和线性反应模型研究了具有各种包壳的UO ₂ -BeO燃料的中子学性质。建议使用二阶多项式函数来描述循环结束时反应性差异与UO ₂ -BeO燃料中铀富集度和BeO体积分数这两个因素之间的关系。确定铀富集以确保使用锆合金，FeCrAl和SiC包层的每个BeO馏分具有相同的循环长度。对于给定的BeO分数，在锆合金和SiC覆层之间观察到类似的中子性质，包括无限倍增系数，气体释放，功率分布和同位素浓度。UO ₂的重要功能-BeO燃料可产生⁴ He，与当前的UO ₂燃料相比，意义重大。在UO ₂ -BeO-FeCrAl燃料包覆系统中，氙和k的生产率较低，而在UO ₂ -BeO-锆合金和UO ₂ -BeO-SiC系统中的氙和production的生产率与当前的UO非常相似_2-锆合金系统。对于具有相同包层的更高的BeO分数，组件和燃料芯块中的功率分布更平坦。与其他两个包层相比，含FeCrAl的燃料组件的峰值功率更高，而三个包层的径向功率分布却非常相似。