Visual experiment device for melting of nuclear reactor fuel rod and method

Abstract

The invention provides a visual experiment device for melting of a nuclear reactor fuel rod and a method. The visual experiment device comprises a high-temperature melting furnace provided with a plurality of transparent windows, wherein a test article is vertically arranged in the high-temperature melting furnace; rhenium-molybdenum electrodes are arranged at the upper end and the lower end of the test article respectively and connected with copper electrodes penetrating the side wall of the high-temperature melting furnace; the test article comprises the fuel rod; a tungsten-rhenium heatingrod is arranged in the fuel rod; a cooling water circulation system used for cooling the high-temperature melting furnace is arranged outside the high-temperature melting furnace. By means of the cooling water circulation system for the high-temperature melting furnace, the temperature of the outer side of the furnace body is kept in safe limits, an external high-speed camera can work normally, and a core melting process under a severe accident of a reactor can be simulated realistically. Obtained experiment data can provide verification for the traditional numerical simulation method, and uncertainty of the existing severe accident analyzing procedure is reduced.

Description

technical field [0001] The invention relates to a visualization experiment device and method under severe accident conditions, in particular to a nuclear reactor fuel rod melting visualization experiment device and method, and belongs to the field of experiment measurement visualization methods. Background technique [0002] The material in the reactor will melt into a liquid state when it reaches its own melting point. The eutectic effect of different materials will further reduce this melting temperature. These core material melts will flow downward and enter the lower horizontal position of the reactor core, and there is a certain probability that the area of ​​the reactor coolant flow channel will be reduced. With the further development of severe accidents, core melts continue to accumulate in the coolant flow channels, which will lead to blockages in the flow channels between some fuel assemblies, which will further reduce the cooling capacity of the core and make the...

AI Technical Summary

Problems solved by technology

This makes the research and analysis of the phenomenon very difficult, and the traditional severe accident analysis program simulation faces great challenges in this respect

Because the specific process and phenomenon of fuel rod melting inside the reactor cannot be observed in the existing device, the existing severe accident analysis program can only simulate and analyze the macroscopic lumped parameters, and cannot accurately describe the process and mechanism of the severe accident

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