Simulation device for high temperature resistant rod bundle fuel assembly based on diffusion welding

Abstract

The invention discloses a high-temperature-resistant rod bundle fuel assembly simulation device based on diffusion welding. The heating rod bundle simulation body is fixed by the fuel assembly positioning grid simulation body arranged in sequence along the axial direction, and placed in the ceramic flow according to the arrangement of the core rod bundle. In the channel chamber, the outer side of the ceramic flow channel chamber is a pressure-bearing sleeve, and the two ends of the cylinder wall are respectively arranged with an inlet joint and an outlet joint. Connect with the external power supply after bundle sealing the end cap. The diffusion welding method of the present invention enables the temperature of the wall surface of the heating rod bundle simulation body to exceed the melting point of silver brazing, and maintains the temperature of the high-temperature sealing ring below the design standard through the cooling flow channel formed in the rod bundle sealing end cap by diffusion welding, so that The operating condition of the rod bundle fuel assembly simulation body can reach the actual temperature and pressure level of the nuclear reactor, and can be used to accurately simulate the high temperature and high pressure flow and heat transfer state in the rod bundle channel under any axial power distribution during the life of the nuclear reactor.

Description

technical field [0001] The invention relates to the field of high temperature and high pressure thermal hydraulic test simulation devices, in particular to a high temperature resistant rod bundle fuel assembly simulation device based on diffusion welding. Background technique [0002] The vast majority of nuclear power plants in operation in the world use bundle fuel assembly cores. The rod-shaped fuel pellets are wrapped with a zirconium alloy cladding, and the radioactive substances generated during the operation of the core are isolated inside the cladding. At the same time, the heat generated by the fission of the fuel pellets is also transferred to the cooling medium outside the cladding through the cladding. The integrity of the core fuel cladding is the most important layer of multilayer shielding from radioactive material in a nuclear reactor design. Under the operating conditions of the reactor, when the heat flux generated by the fission of the fuel pellet is hig...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a high-temperature resistant rod bundle fuel assembly simulation device based on diffusion welding, so as to solve the problems of short service life in existing simulation body tests and poor performance in high temperature and high pressure working conditions in critical boiling tests.

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