基于首次碰撞源方法的多维S<sub><i>N</i></sub>射线效应研究

基于首次碰撞源方法的多维S_N射线效应研究

摘要: 通过半解析法求解由孤立点源产生的未碰撞中子源项，进而求出首次碰撞源分布，以将孤立的源分布到更广的范围中，从而减轻由离散纵标法计算产生的射线效应。编制了适应于三维离散纵标计算程序CTDOS的射线效应减轻程序REM3D，与Kobayashi三维基准题的结果进行比对，证明了射线效应减弱的正确性与本程序的可行性。

Abstract: The uncollision neutron source was calculated from isolated source by semi-analytic method, and distribution of first collision source for the models was achieved. In this way, the theory to mitigate ray effect of S_N theory by distributing the isolated source into range area was established, and the corresponding code REM3D for three-dimensional discrete ordinate code CTDOS was also developed. The results on Kobayashi benchmark indicate that this theory is appropriate and this program is correct.