Experimental device for assessing performance of nuclear fuel cladding pipe under simulated LOCA working condition

Abstract

The invention relates to an experimental device for assessing performance of a nuclear fuel cladding pipe under the simulated LOCA working condition. The experimental device comprises a mold cavity, an upper seal head, a lower seal head and a heating device; the mold cavity comprises vacuum cavities and a quenching cavity which are formed through dividing of sealing parts, the nuclear fuel cladding pipe at least comprises two sections, every two sections are connected with each other through a connecting part in a sealing mode, the two ends of each connecting part can be slidably arranged in the nuclear fuel cladding pipe, and an experimental pipe can freely telescope after being subjected to heating expansion; the heating device comprises a heating body, and the heating body is insulated from the inner wall of the nuclear fuel cladding pipe through the upper seal head, the lower seal head and the connecting parts. According to the experimental device, the fuel cladding pipe can freely expand and telescope in the pipe heating process, the expansion bending phenomenon in the nuclear fuel cladding pipe heating process can be prevented from occurring due to the fact that every two adjacent nuclear fuel cladding pipe sections are movably arranged in a sealed mode through one connecting part, and therefore the performance of the nuclear fuel cladding pipe can be accurately assessed.

Description

technical field [0001] The invention relates to an experimental device for evaluating the performance of nuclear fuel cladding tubes under simulating LOCA working conditions, in particular to an experimental device for evaluating the performance of nuclear fuel cladding tubes in high-temperature water vapor oxidation and quenching when simulating LOCA working conditions. Background technique [0002] The nuclear fuel cladding tube is a protective layer outside the nuclear fuel pellet, which protects the fuel pellet from the erosion of the coolant, prevents the leakage of fission products in the fuel, keeps the coolant from contamination, and maintains the geometry of the fuel element Shape and make it have sufficient rigidity and mechanical strength. The cladding is an important part of the most severe working conditions in the reactor. Its working condition is that it contains nuclear fuel, withstands high temperature and pressure and strong neutron radiation, is subject t...

AI Technical Summary

Problems solved by technology

At present, there are few devices for simulating cladding behavior under LOCA working conditions, and most of them use external heating to facilitate temperature control. This method does not conform to the real working conditions of LOCA, and cannot more realistically respond to the behavior of materials under working conditions. performance

At the same time, the nuclear fuel cladding tube of some experimental devices cannot expand freely during the heating process, so the fuel nuclear fuel cladding tube bears a certain external force during the whole test process, which will have a certain impact on the test results and cannot accurately reflect the material. Real performance, there is also a part of the experimental device that the nuclear fuel cladding tube can expand freely during the heating process, but it has the problem of bending after expansion, which cannot make the cladding tube free to expand and contract, and more accurately test the performance of the material

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