蒙特卡罗方法在快堆组件参数计算中的应用

Application of Monte Carlo Method in Fast Reactor Assembly Homogeneous Constant Calculation

在快中子反应堆中,中等核素的散射共振现象以及空间耦合效应较为明显。为解决此问题,使用基于蒙特卡罗方法的Open MC程序产生少群快堆组件参数,传递给基于确定论方法的堆芯程序进行混合计算。采用二维径向-轴向坐标几何的等效堆芯作为产生组件参数的计算模型。数值结果表明,该方法很好地解决了结构材料在高能区的散射共振现象;同时混合计算的相对误差均小于1%,可应用于快堆的稳态计算。

In the fast reactors, the scattering resonance of intermediate weight nuclide and the space-coupling effects are significant. To solve these problems, this study uses Open MC based on Monte Carlo method to generate the few group constants and combines the deterministic method to do the core calculation. For this analysis, 2D R-Z homogeneous core model was used for the generation of the constants. The assembly calculation shows that the scattering resonance in high energy region can be well dealt with. Both keff and power distribution have a discrepancy of less than 1% from the reference solution. Therefore, this hybrid method is suitable for the fast reactor analysis.