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

Abstract

The present invention provides a particle burnable poison reactivity control method, a burnable poison plate and a fuel rod provided, wherein particle burnable poison parameters are obtained by setting the initial remaining reactivity and the service life of a reactor core and inputting the initial remaining reactivity and the service life of the reactor core into a reactor core reactivity and burnup change model; the particle burnable poison parameters comprise a particle type, a particle diameter, a particle volume fraction, a particle doping rate and a particle porosity; target particle burnable poison is selected based on particle burnable poison parameters and added into the reactor core, the burnup rate of the poison is increased, burnable poison residues at the end of life are reduced, burnable poison segmentation is facilitated, and control over the residual reactivity of the reactor core is facilitated.

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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