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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。
The covariance matrix information characteristics of multi-group nuclear cross-sections were analyzed. The flat-source approximation was used to study the multi-group cross-section covariance matrix group transformation method and the self-developed nuclear cross-section covariance matrix transformation group general procedure T-COCCO. Based on the information of covariance matrix of 44 kernels in SCALE6.1 program, we can transform the energy group structure of covariance matrix of nuclear cross section by T-COCCO for different nuclear reactions of 235U, 238U, 239Pu and other radionuclides, and obtain 33 groups, 47 and 70 groups of nuclear cross-section covariance matrix, and NJOY program produced by the response energy cluster nuclear cross-section covariance matrix information were compared. Compared with the information of matrix characteristic parameters, we can see that when the difference of energy group structure is small (the number of energy groups changes less than twice), the method of group transfer is reasonable, and the developed program can be conveniently, quickly and efficiently obtained The information of the covariance matrix of the nuclear cross section of the required group structure can be used to carry out the nuclear data calculation uncertainty and sensitivity analysis.