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超热中子计算在压水堆的物理计算中占有重要地位。本文是用蒙特卡罗方法计算压水堆燃料组件内的超热中子谱及其空间分布。在计算中,由于对燃料组件的非均匀布置和共振截面都没有作简化,因而可以得到准确度较高的计算结果。本方法考虑了燃料棒的自屏及互屏效应,可以精确地计算出丹可夫因子,避免了引进各种近似所带来的误差。
The calculation of superheat neutrons occupies an important position in the physical calculation of PWR. In this paper, the Monte Carlo method is used to calculate the superheated neutron spectrum and its spatial distribution in PWR fuel assemblies. In the calculation, the non-uniform arrangement of the fuel assembly and the resonance cross-section are not simplified, so that the calculation result with high accuracy can be obtained. The method takes into account the self-screen and cross-screen effect of the fuel rods, can calculate the Dankoff factor accurately, and avoids the error caused by the introduction of various approximations.