Calculation method of resonance self-shielding based on equivalent one-dimensional plate model for plate-shaped fuel

Abstract

The invention discloses a resonance self-shielding calculation method by aiming at plate type fuel on the basis of an equivalent one-dimensional plate model. The method comprises the following steps that: 1: for the resonance self-shielding calculation problem of the plate type fuel, adopting a neutron current method to calculate each section of Dancoff correction factor of each piece of plate type fuel; 2: according to a function relationship between the Dancoff correction factor and one-dimensional moderator thickness, under a situation of a known Dancoff correction factor, adopting a binary search method to obtain the moderator thickness; and 3: adopting a subgroup method or a superfine group method to calculate an equivalent one-dimensional fuel plate to obtain the effective self-shielding section of each layer of the fuel plate. Compared with a traditional resonance self-shielding calculation method, the resonance self-shielding calculation method disclosed by the invention is characterized in that the problem of plate type fuel subjected to complex arrangement can be calculated, the method is higher in calculation efficiency, and the effective self-shielding section related to space can be obtained.

Description

technical field [0001] The invention relates to the technical field of nuclear reactor core design and safety, in particular to a resonance self-shielding calculation method based on an equivalent plate-plate model for plate-shaped fuel. Background technique [0002] The plate-shaped fuel core has the characteristics of complex layout, so the geometry of the problem is non-structural geometry, and the resonant self-shielding calculation method is required to be able to deal with this complex geometry. At the same time, the calculation of the high-fidelity one-step method requires no homogenization of the space, and only one-step calculation of the entire core to obtain the effective value-added factor and power distribution. Therefore, the calculation amount is very large, and the resonance self-screen calculation is required to have very high calculation efficiency. . The traditional burnup calculation only calculates the average nucleon density of the plate, and the calcu...

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Problems solved by technology

However, the calculation amount of the ultrafine group is very large, and it cannot be directly used for the resonance self-shielding calculation of the whole stack of the plate-shaped fuel core.

[0004] Therefore, none of the existing three methods can be directly used for the resonance self-shielding calculation of the full stack of the plate-shaped fuel core. It is necessary to study a new resonance self-shielding calculation method to solve the challenges brought by the plate-shaped fuel core.

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