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研究堆中水平辐照孔道用以从堆芯附近引出高能中子流。由于水平辐照孔道的几何形状比较复杂 ,采用两维输运计算模型将会引入较大的误差 ;同时 ,在计算过程中由于粒子穿行的距离比较长 ,所需的计算时间也是很大的。讨论了如何用 Monte Carlo方法的 MCNP程序进行水平孔道的屏蔽计算 ,引入了分段 -衔接计算方法 ,着重介绍了与 MC-NP的接口和表面源的设置问题。计算结果表明 ,分段 -衔接的 MCNP方法能够大大的改善 Monte Carlo方法的抽样 ,很好地解决水平辐照孔道的屏蔽计算问题
The horizontal irradiation tunnels in the research reactor are used to draw high-energy neutron flux from near the core. Due to the complex geometry of the horizontal irradiation aperture, the two-dimensional transport calculation model will introduce a large error; at the same time, the computational time is also very large due to the longer distance the particles travel. This paper discusses how to use MCNP program of Monte Carlo to calculate the shielding of horizontal channels, and introduces the segmentation-jointing method. The interface with MC-NP and the setting of surface source are emphatically introduced. The results show that the segmented-coherent MCNP method can greatly improve the sampling of the Monte Carlo method, and can well solve the problem of shielding calculation of horizontal irradiation holes