Irradiation setup for studying chemical diffusion effects between materials

Abstract

The invention discloses an irradiation device for studying chemical diffusion between materials, which comprises a sleeve, a first end plug and a second end plug arranged at opposite ends of the sleeve, arranged in the sleeve and At least one diffusion coupling unit that abuts against the second end plug, abuts against an elastic buffer between the first end plug and the diffusion coupling unit; the diffusion coupling unit includes a unit base, and is composed of A first material piece and a second material piece made of materials; the first material piece and the second material piece are attached and stacked in the unit base. The irradiation device of the present invention is used to study the chemical diffusion between different materials in the irradiation environment. In the diffusion coupling unit, the material parts are arranged in the unit base to avoid direct contact between the material parts and the sleeve for radial Heat transfer, improve the shielding effect of the sleeve on the radial heat transfer of the diffusion coupling unit, improve the temperature control accuracy of the material interface, and achieve the purpose of precise temperature control in the experiment.

Description

technical field [0001] The invention relates to the technical field of nuclear fuel, in particular to an irradiation device for studying chemical diffusion among materials. Background technique [0002] During the development and use of materials, it is necessary to focus on the chemical diffusion between different materials, because chemical diffusion will affect the performance of materials, which may be negative, which in turn will affect the performance of the corresponding products and reduce the safety margin. [0003] In particular, for the development and use of new nuclear fuel materials, it is more necessary to focus on the impact of chemical diffusion on product performance. Because nuclear fuel generally operates in high temperature, high pressure and high neutron flux irradiation environment, the chemical diffusion between the pellet and the cladding is more likely to occur due to the high temperature operating environment, especially in the high neutron flux ra...

AI Technical Summary

Problems solved by technology

Because nuclear fuel generally operates in high temperature, high pressure and high neutron flux irradiation environment, the chemical diffusion between the pellet and the cladding is more likely to occur due to the high temperature operating environment, especially in the high neutron flux radiation environment of the reactor. Under the environment, plus the comprehensive effect of nuclear fuel fission products on the pellet-cladding interface, the mechanism of pellet-cladding chemical diffusion in nuclear fuel is complicated and easy to occur

Currently, it has been documented that chemical diffusion between the pellet and the cladding can cause the cladding to fail at lower stress states, thereby compromising the integrity of the radioactive containment barrier of the fuel system

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