A Small Size Ring Heating Rod with High Heating Power

Abstract

The invention relates to a small-sized annular heating rod with high heating power, comprising a heating rod inner casing, a heating rod outer casing and a ceramic insulating ring; the heating rod outer casing is covered outside the heating rod inner casing; the ceramic insulating ring is set Between the inner and outer shells of the heating rod to support the inner shell of the heating rod and the outer shell of the heating rod; the ceramic insulating ring is also provided with a plurality of heating holes distributed along the circumferential direction; the heating holes are provided with capillaries Heating wire. The beneficial effects of the present invention are as follows: the present invention can realize the simulation of fuel elements outside the pile, insert the heating wire into the ceramic insulating ring with a plurality of small holes, and change the previous heating wire, magnesium oxide insulation, stainless steel cladding, oxidation The four-layer structure design of the aluminum core block only uses the double-layer structure of the heating wire and the ceramic insulating ring to meet the requirements of heating and insulation in a small space and achieve a high heat flux density.

Description

technical field [0001] The invention belongs to the field of nuclear industry, and in particular relates to a small-sized annular heating rod with high heating power. Background technique [0002] In nuclear industry-related tests, in order to simulate the heating of nuclear fuel under reactor loss of water accident conditions, simulated fuel rods are usually used to simulate the heating of fuel rods in the actual nuclear industry. [0003] The heat generated by the fission of the fuel rod pellets is transferred to the inner and outer cladding of the fuel rod (ordinary fuel rods are solid, so there is no fuel rod inner cladding), so that the surface of the cladding reaches a higher temperature, so as to study the safety of cladding materials at high temperatures. performance. [0004] The cross-section of the fuel rods currently used in pressurized water reactors is as follows: figure 2 As shown, it is mainly composed of pellets and fuel rod outer cladding; while the simul...

AI Technical Summary

Problems solved by technology

This design makes the electric heating wire tightly wound between the inner and outer tubes, which adds additional constraints to the inner and outer tubes, which affects the results of material mechanical performance tests. There is no cavity that can be filled with inert gas, so it is not suitable for off-pile test

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