适用于ADS组件计算的HELIOS程序多群数据库制作研究

针对HELIOS程序用于加速器驱动次临界系统（ADS）组件计算时，程序自带多群数据库核素不全的问题，研究制作了一套适用于ADS组件计算的HELIOS程序多群数据库。基于ENDF/B VII.0，按照HELIOS程序多群数据库制作流程，针对程序自带数据库已有核素16O，重新制作45群数据库并进行微观、宏观检验，结果初步验证了多群数据库制作方法的正确性。针对自带数据库没有的核素，扩充了HELIOS程序自带112群数据库核素，并用栅元规模进行了验证，结果进一步表明多群数据库制作方法正确。针对HELIOS计算结果与MCNP基准值相对偏差较大的问题，提出了基于小背景截面的多群数据库修正方法，并对该方法进行了数值验证，结果表明该方法对计算结果有明显改进。 

Study on Processing Methods of HELIOS Format Multi-Group Library Applicable for ADS Assembly Calculation

The HELIOS program built-in multi-group library does not include all the nuclides in the accelerator driven subcritical system(ADS) when it is applied in ADS assembly calculation. To solve this problem, the generating HELIOS format multi-group library method applicable for ADS assembly transportation calculation is studied. Based on ENDF/B VII.0, following the flow scheme of multi-group library generation, a new 45 groups library is generated for 16O that included in HELLIOS program built-in multi-group library, and examined at micro and macro levels. The results indicate that the method of generating multi-group library is correct. For nuclides that are not in the built-in multi-group library, HELLIOS program built-in 112 groups library is expanded and numerically validated by ADS cell. The results further indicate that the method of generating multi-group library is correct. Since the results calculated by HELIOS have large deviation from that by MCNP, the method to improve a multi-group library is proposed and numerically validated. The results indicate the relative deviation is obviously reduced after improvement compared to the original one.