一种基于蒙卡的氦氙小型堆精确截面均匀化方法，基于蒙特卡洛计算方法对氦氙冷却小型反应堆进行二维全堆芯建模以描述堆芯的几何和材料分布，并根据核反应率守恒原理统计不同材料区域的少群均匀化截面；基于含铍材料区的(n，xn)截面对少群均匀化截面进行修正，以考虑铍反射层的中子学特性；再通过循环计算超级均匀化因子并迭代更新少群均匀化截面，实现进一步修正。本发明能够显著降低氦氙冷却小型反应堆的截面均匀化的误差，对于开展氦氙冷却小型反应堆的堆芯物理计算具有重要作用。

A Monte Carlo-based method for accurate cross-section homogenisation of helium-xenon small reactors, based on Monte Carlo calculations for two-dimensional full-core modelling of helium-xenon-cooled small reactors to characterise the geometrical and material distributions of the core, and counting of the few-group homogenised cross sections in different material regions according to the principle of nuclear reaction rate conservation; correcting the few-group homogenised cross sections based on the (n, xn) cross sections in the beryllium-containing material region to take into account beryllium reflective layers' neutronics properties of the beryllium reflective layer; and further corrections are achieved by cyclically calculating the super homogenisation factor and iteratively updating the few-group homogenisation cross section. The present invention can significantly reduce the error of cross-section homogenisation for helium-xenon-cooled small reactors, which is important for core physics calculations of helium-xenon-cooled small reactors.