A large-scale nuclear reactor fusion pool natural convection heat transfer test system and method

Abstract

A large-scale nuclear reactor molten pool natural convection heat transfer test system and method, the system includes a large molten pool natural convection heat transfer test piece, a molten salt heating furnace that provides high-temperature molten matter, a nitrogen source connected to the test piece and the molten salt furnace, And the cooling water circuit; the test system also includes supporting power distribution equipment, instrument control equipment and data measurement and acquisition equipment; in the cooling water circuit, the centrifugal pump drives the water in the cooling water tank to take away the decay heat source through the cooling channel of the test piece The cooling water returns to the cooling water tank after returning to the initial water temperature through the plate heat exchanger and the cooling tower; the test ends when the temperature of the melting pool reaches a steady state, and the waste liquid in the test piece is discharged into the waste liquid pool; The test method is provided; the invention carries out the natural convection heat transfer test of the melting pool of a large-scale nuclear reactor, and obtains the heat transfer data of the melting pool under severe accident conditions of the reactor for safety design.

Description

Technical field [0001] The invention relates to the technical field of research on the natural convection heat transfer characteristics of a melting pool under severe accident conditions of a reactor, and in particular relates to a large-scale nuclear reactor melting pool natural convection heat transfer test system and method. Background technique [0002] If the reactor core of a nuclear power plant is not sufficiently cooled under severe accident conditions, the continuous accumulation of decay heat will cause the core to rapidly heat up and melt, and the melted core melt will gradually migrate downwards and melt through the support plate. Fall into the lower head to form a fragment bed melting pool structure. Corresponding to the extreme conditions of full core melting, the melting pool in the lower head generates high Rayleigh number natural convection under the action of the internal heat source, and transfers heat to the wall of the lower head. If the forced cooling of th...

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Problems solved by technology

However, due to the small volume of the test section, the Rayleigh number of the molten pool is smaller than that of the reactor. The molten salt furnace uses the pouring method to pour the high-temperature molten salt into the test piece. This method is used for large-scale high-temperature tests. There is a certain risk in it and it is not feasible

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