# 有效增殖因子对少群宏观截面参数的灵敏度分析Analysis of Sensitivity of keff on the Few-Group of Macroscopic Cross Section Parameters

Abstract: This paper derives sensitivity calculation formulas of thermal neutron reactor effective multiplication factor to the few-group macroscopic cross section, which is based on the perturbation theory, and develops the program PETMUS to calculate sensitivity. This program PETMUS couples the core diffusion program to calculate the sensitivity of keff to the few-group macroscopic cross section. We apply the method of direct perturbation to test and verify the sensitivity of Σa, vΣf, Σs and D. It shows that the research method is correct and that it can be used for the uncertainty analysis of the core physics calculation in the later period.

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