大块板状样品中子核数据宏观基准检验研究

项目名称： 大块板状样品中子核数据宏观基准检验研究

项目编号： No.11505297

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 聂阳波

作者单位： 中国原子能科学研究院

项目金额： 22万元

中文摘要： 评价中子核数据是中子学计算的基础数据，它的可靠性和精准度直接影响核工程设计中子学计算结果的质量，甚至关系到成败。宏观基准检验是检验评价数据可靠性的重要手段。目前，加速器驱动次临界系统(ADS)、第四代反应堆（如钍基熔盐堆）以及可控核聚变等已成为国际上新型核能系统研究的热点，这些新型核能系统和传统核反应堆相比，其工作原理和结构设计有较大区别，一些关键核数据存在精度不高甚至部分核素数据缺失的情况。因此，需补充和更新很多核数据库中的数据，比如：①与ADS相关的靶材料核素Bi和Pb；②与钍基熔盐堆相关的Th；③结构材料元素，如Al、Cu等；④屏蔽材料元素，如Si、Fe等。本研究的目的是基于中国原子能科学研究院现有的实验设备，建立一套大体积样品核数据宏观基准检验实验系统。利用标准样品法完成系统检验，为将来开展其他重要核素的基准检验奠定基础，为建立相对完善的核燃料增殖与嬗变相关数据库提供实验数据支持。

中文关键词： 基准检验；评价中子核数据；飞行时间；泄漏中子谱；氘氚中子

英文摘要： Evaluated nuclear data is the basic data of the neutronics calculation. Its reliability and accuracy affect the design of nuclear engineering directly. Benchmark experiment is an important means to validate the accuracy of the evaluated nuclear data. At present, the Accelerator Driven sub-critical System (ADS), the fourth generation reactors (such as thorium-based molten salt reactor) and fusion reactor attract more and more interests in the world as new type of nuclear systems. Compared to traditional nuclear reactor, its working principle and structure design are different, the accuracy of some corresponding nuclear data are not good enough and some nuclear data are even missing. Therefore, these data need to be renewed or complemented. For example, 1) the nuclear data of Bi and Pb, associated with the ADS target material; 2) the nuclear data of Th, which related with Thorium-based molten salt reactor; 3) the structure material such as Al and Cu;4) the shielding material such as Si and Fe. The purpose of this study is to build a benchmarking experimental system with large slab sample. System test using standard sample method will be performed, and more experiments will be done in the future for benchmarking of other important nuclear data. This work will provide experimental data to support the establishment of the database related to fuel proliferation and waste transmutation.

英文关键词： benchmarking experiment;evaluated nuclear data;time of flight;neutron leakage spectrum;D-T neutron