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

A reactivity control and reactivity technology, applied in the control of nuclear reactions, reactor fuel materials, reactors, etc., to increase the absorption area, improve flexibility and operational safety, and reduce the effect of neutron absorption capacity

Active Publication Date: 2021-02-26
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

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Embodiment 1

[0031] The invention provides a method for controlling the reactivity of particulate combustible poisons, comprising:

[0032] By setting the residual reactivity and lifetime at the beginning of the core life, and inputting the residual reactivity and lifetime at the beginning of the core life into the core reactivity and burnup change model, the parameters of the particulate burnable poison are obtained; the particulate burnable poison The parameters include particle type, particle diameter, particle volume fraction, particle doping ratio, and particle porosity; based on the particle burnable poison parameters, the target particle burnable poison is selected to add to the core.

[0033] Among them, the particulate burnable poison refers to the burnable poison existing in the form of particles. Compared with the conventional uniformly distributed form of burnable poison, the burnable poison in the form of particles can increase the space self-shielding effect of the burnable p...

Embodiment 2

[0038] Such as figure 1 and figure 2 As shown, the target particle combustible poison in the form of particles is uniformly and randomly dispersed in the fuel matrix. According to the residual reactivity at the beginning of the core life and the length of life, the fuel enrichment degree of the matrix in this embodiment is 4.45%, and the particle type is B 4 C. The particle diameter is 100 μm, the particle volume fraction is 5%, the particle doping rate and particle porosity are 0% to realize the control of reactivity, and the neutron absorption of the particle is gradually released through the space self-shielding effect of the particle combustible poison , the poison burnup rate is effectively controlled, so that the reactivity of the core during its entire life is effectively controlled.

[0039] Specifically, dispersing the target particle burnable poison in the fuel matrix does not occupy the position of the fuel cell, and at the same time, it does not cause serious pow...

Embodiment 3

[0041] Such as image 3As shown, the target particle burnable poison can not only be dispersed in the fuel matrix, but also can be used to form a separate burnable poison to form burnable poison pellets, and then use the burnable poison pellets to form a burnable poison plate. In this embodiment, Er2O3 pellets are used in the separated burnable poison plate. The diameter of the burnable poison pellets is 500 μm, the particle volume fraction is 45%, and the particle doping rate is 20%. The base material of the burnable poison plate in this embodiment is doped with zirconium, and the particle porosity is 0%.

[0042] Specifically, the separated burnable poison composed of target particle burnable poison not only helps to increase the absorption area of ​​the burnable poison, but also increases the burnup rate of the poison so as to reduce the residual poison at the end of life, and facilitates the division of the poison, which is beneficial to the residual reaction of the reacto...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C3/58G21C7/04
CPCG21C3/58G21C7/04Y02E30/30
Inventor 娄磊柴晓明姚栋王连杰于颖锐李庆彭星杰夏榜样陈长刘同先李满仓陈亮刘晓黎甯忠豪
Owner NUCLEAR POWER INSTITUTE OF CHINA
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