Resonance self-shielding calculation method by aiming at light-water reactor on the basis of equivalent one-dimensional rod model

Abstract

The invention discloses a resonance self-shielding calculation method by aiming at a light-water reactor on the basis of an equivalent one-dimensional rod model. The method comprises the following steps that: 1: for the resonance self-shielding calculation problem of the light-water reactor l, adopting a neutron current method to calculate each section of Dancoff correction factor of each fuel rod; 2: according to a function relationship between the Dancoff correction factor and a one-dimensional moderator external diameter, under a situation of a known Dancoff correction factor, adopting a binary search method to obtain the moderator external diameter; and 3: adopting a subgroup method or a superfine group method to calculate an equivalent one-dimensional fuel rod to obtain the effective self-shielding section of each circle of the fuel rod. 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 complex geometry 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 one-dimensional rod model for a light water reactor. Background technique [0002] Traditional light water reactor core fuel management calculation generally adopts a two-step method, that is, firstly, the minority group constant is obtained through component calculation, and then the core reactivity, critical boron concentration, etc., and power distribution data are obtained through core calculation. However, this method will introduce problems such as spatial homogenization errors and history effects, so the high-fidelity calculation of the whole core one-step method has been paid more attention in recent years. The one-step method means that without spatial homogenization, data such as reactivity, critical boron concentration, and power distribution are obtained directly throug...

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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-screen calculation of the whole stack.

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

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