Computation method for obtaining high-fidelity resonating group constant of nuclear reactor

Abstract

The invention discloses a computation method for obtaining a high-fidelity resonating group constant of a nuclear reactor. According to the method, a background section of target resonating nuclides on a target energy group is obtained based on high-efficiency iterative computation of an ESSM method, equivalent lattice cell dimensions are obtained according to the background section obtained after heterogeneous resonance integral table fitting and a lattice cell dimension relation formula, the geometry, materials and temperature of fuel, jackets, etc. are kept unchanged, and equivalent 2-D lattice cells are established; and a neutron moderation equation for a relevant superfine group is solved to obtain the high-fidelity resonating group constant. Compared with a non-deterministic theory method, computation efficiency can be remarkably improved, and economical efficiency is improved; meanwhile, compared with a method based on directly solving a problem-related moderation equation, collision probability computing time can be remarkably shortened, computation efficiency is improved, and meanwhile the defect of huge storage capacity is avoided; compared with a resonance computation method based on a resonance integral table, resonant interference, spatial self-shielding and a temperature distribution effect can be precisely treated by solving the neutron moderation equation of the 2-D lattice cells, and the high-fidelity resonating group constant of fine distribution in each part of fuel is obtained.

Description

technical field [0001] The invention relates to the nuclear reactor core and the field of nuclear reactor physical calculations, in particular to a calculation method for obtaining high-fidelity resonance group constants of nuclear reactors. Background technique [0002] In the traditional two-step PWR neutronics calculation, the resonance calculation is required to provide the average multi-group resonance cross section in each fuel zone. The development of full-core high-fidelity neutronics calculations requires the provision of precise resonance group constants that are finely distributed in each fuel region in the full-core, which has become a new goal for resonance calculations, which cannot be met by traditional resonance calculation methods. [0003] High-fidelity resonance calculations not only need to deal with the macroscopic inhomogeneity caused by the layout of different types of cells, but also need to deal with the inhomogeneity and local inhomogeneity caused b...

AI Technical Summary

Problems solved by technology

Although the method of directly solving the large-scale neutron moderation equation can accurately deal with local inhomogeneity and give finely distributed resonance group constants, the data storage capacity is huge and the calculation efficiency is low, which cannot be adapted to fuel consumption calculations, etc.

The resonance calculation method based on the resonance integral table, such as the embedded resonance calculation method (ESSM method), has high calculation efficiency for macroscopic non-uniformity, but cannot accurately deal with local non-uniformity, and cannot meet the requirements of high-fidelity resonance calculation.

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