Particulate burnable poison reactivity control method, burnable poison plate and fuel rod

Abstract

The method for controlling the reactivity of particulate combustible poisons, combustible poison plates and fuel rods provided by the present invention is to set the residual reactivity at the beginning of the core life and the length of the lifetime, and input the residual reactivity and the lifetime of the core at the beginning of its life. In the core reactivity and burnup change model, the parameters of the particulate burnable poison are obtained; the parameters of the particulate burnable poison include particle type, particle diameter, particle volume fraction, particle doping rate and particle porosity; the target particles are selected based on the particle burnable poison parameters Burnable poisons are added to the core to increase the rate of poison burnup, reduce the residue of burnable poisons at the end of life, and facilitate the segmentation of burnable poisons, which is beneficial to the control of the remaining reactivity of the core.

Description

technical field [0001] The invention relates to the technical field of nuclear reactor cores, in particular to a method for controlling the reactivity of particulate combustible poisons, a combustible poison board and a fuel rod. Background technique [0002] In the reactor core design, since there is often a large residual reactivity at the beginning of the core life and during the core life, soluble boron, burnable poisons and control rods are generally used to control the residual reactivity of the core. Among them, the combustible poison, as a kind of neutron absorbing material, will have a space self-shielding effect when it exists in the core in the form of particles, so that the material on the outer surface of the particle will absorb neutrons first, resulting in less neutron absorption by the material from the inside to the center of the particle Can't even absorb neutrons. Due to the space self-shielding effect, compared with the combustible poisons in the form of...

AI Technical Summary

Problems solved by technology

However, at present, the effect of the particle type and volume fraction on the residual reactivity of the core when the burnable poison in the form of particles is added to the fuel matrix is ​​only considered from a macroscopic point of view, and no microscopic point of view (such as particle size, particle volume fraction, particle doping ratio, particle porosity) considering the effect of burnable poison in the form of particles on the residual reactivity of the core

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