Experimental system and method for ultra-high temperature corrosion of structural materials under severe nuclear reactor accidents

Abstract

The ultra-high temperature corrosion experimental system and method of structural materials under severe nuclear reactor accidents, the system includes a gas supply system, a vacuum system, an experimental section, a cooling system and an exhaust gas analysis system; the gas supply system can prepare corrosive gases with different water vapor contents; the experimental section It is composed of high-temperature radiation furnace, low-temperature radiation furnace, ceramic reaction tube, heating wire, air-cooled copper tube and insulation cotton. Two quartz glass windows are set on the side wall of the high-temperature radiation furnace, and a high-speed camera and an infrared temperature measuring probe are respectively placed; the cooling system It can provide necessary cooling for key equipment; the tail gas analysis system can measure the concentration of each component of the corrosion reaction tail gas online, and realize the high-precision continuous measurement of reaction kinetics; the experimental system also includes a power distribution system, a numerical control system, and a data measurement and acquisition system; The invention also provides an experiment method; the invention provides key data for nuclear reactor safety design by carrying out ultra-high temperature corrosion experiments of structural materials under severe nuclear reactor accident environments.

Description

technical field [0001] The invention relates to the technical field of ultra-high-temperature corrosion performance testing of materials, in particular to an ultra-high-temperature corrosion experimental system and method for structural materials under severe nuclear reactor accidents. Background technique [0002] In severe accidents of nuclear reactors, structural materials such as fuel elements, positioning grids, and grid plates are exposed to high-temperature water vapor due to the loss of coolant in the primary circuit, and the temperature can reach more than 2000 °C. At this time, the corrosion behavior of structural materials in the core will have a great impact on the course of severe accidents. With the introduction of the concept of Accident Tolerant Fuel (ATF) in the world, the ultra-high temperature corrosion behavior of new structural materials under severe accidents deserves more and more attention. At present, there are usually two methods for studying the h...

AI Technical Summary

Problems solved by technology

At present, the maximum temperature of the synchronous thermal analyzer on sale for a long time in the water vapor environment can only reach 1750°C; due to the limitation of the heating element and the performance of the furnace tube, the muffle furnace is difficult to operate for a long time above 1700°C

Up to now, there is no suitable instrument and equipment that can be applied to the water vapor environment above 1750°C for long-term and continuous reaction kinetics measurement of materials, and the current equipment cannot visually observe material deformation, cracking, oxide layer shedding, Phenomena such as melting have hindered further understanding of the mechanism of severe accident phenomena

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