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

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.