Research on Nuclear Data Target Accuracy Assessment Based on Subspace Method
According to the target uncertainty limit of reactor physics response calculation,target accuracy assessment solves a problem which identifies the demands for nuclear data uncertainties,which is of great significance for guiding the research direction of nuclear data and improving the economy and safety of reactors.Target accuracy assessment is a nonlinear constrained optimization problem in mathematics.Due to the ultra-large amount of nuclear data,solving the optimization problem in full-space is impossible.Subspace method is an efficient dimensionality reduction method.Through matrix transformation defined by subspace,a high-dimensional problem can be transformed into a low-dimensional problem,while the high-dimensional information is mostly retained,and the stability of numerical calculation is enhanced.Research on ZPPR-9 nuclear data target accuracy assessment based on subspace method shows that,with the 0.3%target uncertainty limit of effective multiplication factor,computational dimension can be reduced from 1170 to 71.The numerical method presented in this paper can be used in future target accuracy assessment calculations.
万方数据
维普
