Multi-resonance nuclide resonance simulation subgroup optimization method and system for reactor assembly

Abstract

The invention discloses a resonance simulation subgroup optimization method. The method comprises the following steps: classifying resonance nuclides; establishing a resonance energy group, and unifying the resonance energy group into a combined energy group; constructing a neutron transport equation; independently obtaining an equivalent macroscopic cross section and source item information of each combined energy group representative nuclide; obtaining the sub-group flux of the combined energy group representative nuclide; obtaining sub-group escape sections of the combined energy groups; obtaining an equivalent microscopic background section; obtaining an equivalent absorption section and an equivalent generation section; and carrying out multi-resonance nuclide resonance simulation onthe reactor assembly. The invention further discloses a multi-resonance nuclide resonance simulation subgroup optimization system for the reactor assembly. According to the multi-resonance nuclide resonance simulation subgroup optimization method and system for the reactor assembly, resonance nuclides in a problem are classified according to classes on the premise of not influencing precision, subgroup flux solving is only carried out on representative nuclides of the resonance nuclides of the same class, the calculation time of a characteristic line method is shortened, and therefore the calculation efficiency is improved.

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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