多群核截面协方差矩阵转群方法研究  

Study of the Transform Method of Multi-Group Nuclear Cross Section Covariance Matrix

作　　者：王冬勇 郝琛 赵强 吴宗佩 吴宏春[2] 李富[3] 

机构地区：[1]哈尔滨工程大学核安全与仿真技术国防重点学科实验室,哈尔滨150001 [2]西安交通大学核科学与技术学院,西安710049 [3]清华大学核能与新能源技术研究院,北京100084

出　　处：《核动力工程》2016年第2期1-6,共6页Nuclear Power Engineering

基　　金：国家自然科学基金资助项目(11505038;11505102);数字化反应堆关键技术研究课题资助项目(GK1150400009);IAEA CRP I3102;HTGR Reactor Physics;Thermal-Hydraulics and Depletion Uncertainty Analysis

摘　　要：分析多群核截面协方差矩阵信息特点,采用平源近似研究多群核截面协方差矩阵转群方法并自主开发核截面协方差矩阵转群通用程序T-COCCO。以SCALE6.1程序自带44群核截面协方差矩阵信息为基础,通过T-COCCO对235U、238U、239Pu等核素的不同核反应进行核截面协方差矩阵能群结构转换,分别得到33群、47群和70群核截面协方差矩阵,并与NJOY程序制作的响应能群核截面协方差矩阵信息进行对比。对比研究及分析矩阵特性参数信息可知:在能群结构差异不大时(能群数目的变化在两倍以内),本文研究的转群方法是合理的,开发的程序可以方便、快捷、高效获得所需能群结构的核截面协方差矩阵信息,该信息可以用于开展核数据计算不确定性和敏感性分析。Through the analysis of the characteristics of the nuclear cross section covariance matrix, the method of transforming the nuclear cross section covariance matrix in multi-group form into the users＇ group structures has been studied and a general code T-COCCO based on the method has been developed. The nuclear cross section covariance matrix built-in SCALE6.1 is applied and 235U, 238U, the nuclear cross section covariance matrix of some nuclides such as and 239pu in 44 groups structures has been expended or collapsed into different users defined group structures, such as 33 groups, 47 groups and 70 groups. At the same time, the corresponding covariance matrix has been produced by using N JOY for comparison and the matrix eigenvalue and rank has been also studied for verification. The analysis indicates that the method studied in this paper is reasonable and T-COCCO code is convenient friendly and efficient for users to gain the desired multi-group nuclear cross section covariance matrix, which can be applied to uncertainty and sensitivity analysis of nuclear data and physical calculation.

关 键 词：核截面 协方差矩阵 能群结构 转换方法 

分 类 号：TP29[自动化与计算机技术—检测技术与自动化装置]