TMSR-SF高温下多群核数据库的研究  

Study on multigroup nuclear cross section library for TMSR-SF at high temperature

作　　者：周雪梅[1,2] 王小鹤[1,2,3] 

机构地区：[1]中国科学院上海应用物理研究所嘉定园区,上海201800 [2]中国科学院核辐射与核能技术重点实验室,上海201800 [3]中国科学院大学,北京100049

出　　处：《核技术》2014年第12期47-51,共5页Nuclear Techniques

基　　金：中国科学院战略性先导研究项目(No.XDA02001003)资助

摘　　要：基于最新发布的评价核数据库ENDF/B-VII.1,简要介绍了利用标准程序NJOY加工固态燃料钍基熔盐堆(Thorium Molten Salt Reactor-Solid Fuel,TMSR-SF)中子能谱测量所需温度下多群截面库的过程。详细分析了两个典型的核素加工所得核反应道的多群截面与温度的关系,并将不同温度下的截面库用于中子能谱测量,分析了中子能谱测量结果的误差与温度所引起截面库变化的关系。结果表明,不同类型核反应道的截面所受温度影响不同,特别是核素对超热中子的截面存在共振峰问题受温度影响最大,这是由于多普勒效应影响,所以中子能谱测量结果受核反应道选择的影响符合物理规律,加工所得873 K下的核截面库可用于TMSR-SF相关中子能谱测量。Background and Purpose： Thorium Molten Salt Reactor-Solid Fuel （TMSR-SF） is a new type reactor. The neutron energy spectrum, an important parameter for TMSR-SF, needs to be measured, although the environment temperature is very high. The needed libraries for the measurement must be processed due to the special measurement environment. Therefore, the processes and the accuracy for the cross section library are important to the measurement result. Methods： Based on the recently released ENDF/B-VII.1 library, the process of using NJOY to obtain multigroup cross section needed by the neutron energy spectrum measurement of TMSR-SF at certain temperature is introduced. The relationship between multigroup cross section for two typical nuclear reactions and the temperature is analyzed. Homemade libraries at different temperatures are used in the neutron energy spectrum measurement. The difference of the results for neutron energy spectrum with different libraries is shown. Results： Analysis results indicate that the temperature will affect the cross sections of nuclear reactions, especially on the nuclide section of epithermal neutron with resonance peaks due to Doppler effect. The result of neutron energy spectrum measurement is influenced by the selected nuclear reaction. The result accords with the relevant physical laws. Conclusion： The homemade library in 873 K can be used in the neutron energy spectrum calculation for TMSR-SF.

关 键 词：ENDF/B-VII.1 中子能谱 多群核截面加工 TMSR—SF反应堆 

分 类 号：TL329[核科学技术—核技术及应用]