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一维快装置中心反应率模拟计算的灵敏度和不确定度分析
Sensitivity and Uncertainty Analysis of Reaction Rates Ratio for 1-D Fast Critical Benchmarking Facilities
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摘要: 采用广义微扰理论和离散纵标输运计算方法,推导了中心反应率比值对重要核反应参数的灵敏度的计算公式.以一维快基准装置Jezebel-Pu239为例,计算了其中心反应率比值对关键核数据的灵敏度,并结合多群协方差数据,分析了其中心反应率比值计算中由于核数据的不确定度所引入的不确定度及其来源.根据计算结果以及评价数据的协方差信息,建议对Pu-239的非弹截面数据进行更精细的评价,以期降低反应率比的模拟计算不确定度.Abstract: On the base of the generalized perturbation theory and SN method,the theoretical model for calculating the sensitivity and uncertainty of reaction rates ratio (RRR) versus nuclear data is developed.Taking Jezebel-Pu239 critical benchmarking facility as an example,the sensitivity of F49/F25 ratio versus important nuclear data is calculated,as well as the uncertainty arising from the nuclear data.Basing on the sensitivity and uncertainty analysis as well as the covariance information of input evaluated data,refined evaluation of the inelastic data of Pu-239 is considered as a feasible measure to reduce the uncertainty of reaction rates ratios.
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