Method for acquiring nuclear fuel assembly resonance parameters

Abstract

Disclosed is a method for acquiring nuclear fuel assembly resonance parameters. The method includes the following steps: building a commonly-used nuclide multi-group database and a changing curve of resonance peaks along with energy; distinguishing isolated peaks and dense peaks, wherein the interval where the isolated peaks are located is a resonance energy region low energy section with obvious resonance interference, and the interval where the dense peaks are located is a resonance energy region high energy section without obvious resonance interference; solving a subgroup total cross section, a subgroup partial cross section, subgroup probability and corresponding multi-group data coupling in the resonance energy region high energy section by using a subgroup method; coupling calculation of the resonance energy region high energy section and calculation of the resonance energy region low energy section through inter-group scattering from the high energy section to the low energy section, acquiring the resonance parameters of the high energy section, and then calculating a scattering source and a fission source from the high energy section to the low energy section; acquiring a multi-group neutron energy spectrum in a low energy region by using a wavelet expansion method; and merging and continuing the total cross section and the partial cross section by using the multi-group neutron energy spectrum of the resonance region low energy section to acquire the nuclear fuel resonance parameters of the low energy section. By means of the method, resonance parameters of nuclear fuel assemblies with any resonance material composition, any geometry and any quantity of resonance regions can be effectively acquired.

Description

technical field [0001] The invention belongs to the technical field of reactor physical design, and in particular relates to a method for obtaining resonance parameters of nuclear fuel assemblies. Background technique [0002] Acquisition of nuclear fuel assembly resonance parameters is accompanied by the emergence of energy multi-group processing methods in reactor physical design. Obtaining resonance parameters of nuclear fuel assemblies is the basis of reactor assembly design, core design and fuel management, and its accuracy directly affects the accuracy of subsequent calculations. The main purpose of the resonance calculation is to calculate the resonance parameters of the actual nuclear fuel assembly using the multi-group section and resonance integral data of the multi-group database. [0003] All kinds of nuclear fuel assembly resonance parameter acquisition methods based on determinism are mostly limited by the assumptions and approximations of their theoretical mo...

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Problems solved by technology

[0005] In order to solve the above problems, the present invention provides a method for obtaining the resonance parameters of nuclear fuel assemblies, which can effectively obtain the resonance parameters of nuclear fuel assemblies composed of any resonance material, any geometry, and any number of resonance zones; efficiently process the nuclear fuel resonance parameters in the process of obtaining Non-uniform layout, irregular geometry of cells and components, elastic scattering resonance problems

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