Irradiation device for researching chemical diffusion effect among materials

Abstract

The invention discloses an irradiation device for researching a chemical diffusion effect among materials. The irradiation device comprises a sleeve, a first end plug, a second end plug, at least onediffusion coupling unit and an elastic buffer piece, wherein the first end plug and the second end plug are arranged at the two opposite ends of the sleeve; the at least one diffusion coupling unit isarranged in the sleeve and abuts against the second end plug; and the elastic buffer piece abuts against the position between the first end plug and the diffusion coupling unit; the diffusion coupling unit comprises a unit base, and a first material piece and a second material piece which are made of to-be-researched materials; and the first material piece and the second material piece are laminated in the unit base. The irradiation device is used for researching the chemical diffusion effect among different materials in an irradiation environment. In the diffusion coupling unit, the materialpieces are arranged in the unit base, the material pieces are prevented from making direct contact with the sleeve to conduct radial heat transfer, the shielding effect of the sleeve on radial heat transfer of the diffusion coupling unit is improved, the temperature control precision of the material piece interface is improved, and the purpose of precise experiment temperature control is achieved.

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 the fission products of nuclear fuel on the pellet-cladding interface, the mechanism of chemical diffusion of pellet-cladding 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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