Subgroup optimization method and system for multi-resonance nuclide resonance simulation of reactor components

Abstract

The invention discloses a resonance simulation subgroup optimization method, comprising the following steps: classifying resonance nuclides; establishing resonance energy groups, and unifying the resonance energy groups into combined energy groups; constructing neutron transport equations; independently obtaining each combined The energy group represents the equivalent macroscopic cross-section and source item information of the nuclide; obtains the subgroup flux of the combined energy group representing the nuclide; obtains the subgroup escape cross section of the combined energy group; obtains the equivalent microscopic background cross section; obtains the equivalent absorption cross-section and equivalent generation cross-section; perform multi-resonant nuclide resonance simulations of reactor components. The invention also discloses a multi-resonance nuclide resonance simulation subgroup optimization system for reactor components. The present invention is used for the multi-resonance nuclide resonance simulation subgroup optimization method and system of reactor components. On the premise of not affecting the accuracy, the resonant nuclides in the problem are divided into categories, and only the representatives of the same type of resonant nuclides are used. The nuclide is used to solve the subgroup flux, which reduces the calculation time of the characteristic line method, thereby improving the calculation efficiency.

Description

technical field [0001] The invention relates to the technical field of nuclear reactor core design, in particular to a subgroup optimization method and system for multi-resonance nuclide resonance simulation of reactor components. Background technique [0002] When making a multi-group cross-section library, in the resonance energy region, because the absorption cross-section of the resonance nuclide changes drastically, it is impossible to know the flux distribution (that is, the energy spectrum, which is related to the specific problem) in the energy group region in advance, so Information such as the multi-group microscopic absorption cross sections of resonant nuclides in the resonant energy region cannot be directly given in the database. Among them, the subgroup method converts the information contained in the effective resonance integral table into relevant subgroup information (that is, subgroup parameters, including subgroup cross-section and subgroup probability), ...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that in the prior art, the number of grids is large, the number of resonance energy groups is large, and the number of resonance nuclides is large. The traditional method takes a long time to solve the subgroup flux in the characteristic line method, resulting in The calculation time cannot meet the engineering needs, and the purpose is to provide a subgroup optimization method and system for multi-resonance nuclide resonance simulation of reactor components to solve the above problems

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