Large nuclear reactor molten pool natural-convection heat transfer test system and method

Abstract

The invention relates to a large nuclear reactor molten pool natural-convection heat transfer test system and method. The system comprises a large molten pool natural-convection heat transfer test piece, a molten salt heating furnace supplying high temperature melt, a nitrogen source connected to the test piece and the molten salt furnace, and a cooling water loop. The test system also includes supporting power distribution equipment, instrument control equipment and data measurement and acquisition equipment. In the cooling water loop, a centrifugal water pump drives water in a cooling water tank to take away a decay heat source through a cooling channel of the test piece, heated cooling water restores to an initial water temperature through a plate heat exchanger and a cooling tower and then returns to the cooling water tank. When the molten pool temperature reaches a steady state, the test ends, and the waste liquid in the test piece is discharged into a waste liquid pool. The invention also provides a test method. By means of the large nuclear reactor molten pool natural-convection heat transfer test, molten pool heat transfer data under a reactor serious accident condition can be acquired for safety design.

Description

technical field [0001] The invention relates to the technical field of research on natural convection heat transfer characteristics of melting pools under serious accident conditions of reactors, and in particular to a natural convection heat transfer test system and method for melting pools of large nuclear reactors. Background technique [0002] If the reactor core of a nuclear power plant cannot be cooled sufficiently under severe accident conditions, the continuous accumulation of decay heat will cause the core to heat up sharply and melt, and the melted core melt will gradually migrate downward and melt through the support plate. Falling into the lower head to form a debris bed molten pool structure. Corresponding to the extreme condition of full core melting, the melting pool in the lower head generates natural convection with high Rayleigh number under the action of the internal heat source, and transfers heat to the wall of the lower head. If the forced cooling of t...

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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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