压水堆离散纵标屏蔽设计多群参数库的开发与初步验证

利用最新发布的评价数据库ENDF/B-VIII.0制作了压水堆输运计算所需的多群参数库。多群参数库的制作通过NJOY、PUFF-IV和SCALE6.1程序实现，首先由NJOY核数据处理系统将ENDF格式的中光子截面文件加工成精细群参数库，再由PUFF-IV程序中的SMILER模块转换成AMPX格式供SCALE6.1程序中BONAMI模块进行共振自屏修正计算，最后通过并群计算以及格式转换模块生成适合离散纵标（SN）程序使用的ANISN格式的47群中子-20群光子的多群截面库。通过与OECD/NEA发布基准题的验证比较，证明了此参数库加工方法以及所制作参数库是正确的，满足屏蔽计算工程需求。 

Development and Preliminary Verifiation of Multi-Group Cross Section Libraries for PWR Shielding Design Using Discrete Ordinate Method

A broad-group coupled neutron/photon (47n+20γ) cross section library, formatted in ANISN format, dedicated to PWR shielding design, were generated based on the latest evaluation library ENDF/B-VIII.0. The broad-group library was produced by the NJOY, PUFF-IV and SCALE6.1 program. Firstly, a fine-group library was produced using the NJOY99 nuclear data processing system for the generation of the nuclide cross section data files in GENDF format, and then the SMILER module of PUFF-IV was used for the conversion of GENDF format into the AMPX format. Secondly, the neutron resonance self-shielding and temperature effects of the fine-group library are treated using the Bondarenko method by the BONAMI module of SCALE6.1. Finally, the broad-group library was generated by collapsing the fine-group library through the MALOCS and ALPO module of SCALE6.1. The OECD/NEA PWR benchmark was used to validate the new library processed in this paper. Calculation results show that the processing method for the multi-group library proposed in this paper and the multi-group library developed in this paper are correct, which meets the engineering requirement of shield design.