超级均匀化方法在压水堆堆芯Pin-by-pin计算中的应用与研究

在压水堆堆芯Pin-by-pin计算中，采用超级均匀化（SPH）方法作为均匀化技术，对燃料组件传统SPH因子进行计算，生成了Pin-by-pin等效均匀化参数。针对存在中子泄漏现象的反射层组件，研究了与空间泄漏相关的SPH方法，在保证反应率守恒的基础上，同时保证各栅元各能群的中子泄漏率守恒，解决了存在中子泄漏时SPH因子迭代计算的不收敛问题，生成了反射层组件的等效均匀化参数。基于KAIST基准题，分析了压水堆堆芯Pin-by-pin计算中应用SPH因子的堆芯计算精度。数值结果表明，与传统组件均匀化计算方法相比，应用SPH方法的压水堆堆芯Pin-by-pin计算的计算精度更高。

Application and Research of Super Homogenization Method for PWR Core Pin-by-pin Calculation

Super homogenization (SPH) method was used as the homogenization technique of PWR core Pin-by-pin calculation. For the fuel assembly, the traditional SPH method was used to generate the group constants. For the reflector-assembly, the spatial leakage dependent SPH method was evaluated. The problem of non-convergence in the iteration of SPH factors calculation was solved by improved SPH method which can keep the neutron leakage and reaction activity conserved. Based on KAIST benchmark, the performance of the SPH method applied in PWR core Pin-by-pin calculation was evaluated. Numerical results demonstrate that compared with the results of traditional assembly-homogenized calculation, the Pin-by-pin calculations have the higher accuracy.