Testing system and method for interaction study of melt and liquid metals

Abstract

The invention discloses a testing system and a testing method for interaction study of melt and liquid metals. The system comprises a test vessel, wherein a heating furnace is mounted inside the test vessel; materials are heated and molten through electromagnetic induction heating so as to obtain high-temperature melt; high-purity metal sodium in the test vessel is provided by a sodium storage tank connected with the bottom of the test vessel, impurity-containing metal sodium discharged by the test vessel is received by a depositing tank and purified by a filtering device on a pipeline, and the purified metal sodium is discharged into the sodium storage tank again; and the testing system comprises an argon circuit and a vacuum pump, and air in the testing system is removed in vacuumizing and argon filling manners so as to provide inert environmental protection for the testing system. In addition, flow of the liquid metal in the testing system is realized by virtue of differential pressure between the gravity and the vessel. The experiment for interaction between the melt and the liquid metal is carried out, so that the fracture behavior characteristic of the melt in a coolant is disclosed, and assessments are provided for safety design of liquid metal reactors.

Description

technical field [0001] The invention relates to the technical field of the research on the interaction between the core melt and the coolant under severe reactor accident conditions, in particular to a test system and method for the research on the interaction between the melt and the liquid metal. Background technique [0002] When a severe accident occurs in a sodium-cooled fast reactor, the fragmentation process of the high-temperature core melt in the coolant is quite complex and critical. A large amount of knowledge and theory about core damage accidents have been accumulated in the past few decades, which will help to increase the experimental Basis and computer program upgrades. However, there are only some qualitative conclusions about the fragmentation mechanism of the core melt in the coolant, and there is a lack of complete data and mathematical physical models about the fragmentation characteristics of the core melt. During the contact process between the core m...

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Problems solved by technology

[0003] For example, literature (Zhi-Gang Zhang, Ken-Ichiro Sugiyama. Fragmentation of asingle molten metal droplet penetrating into sodium pool. IV. Thermal and hydrodynamic effects on fragmentation in copper [J]. Journal of Nuclear Science and Technology, 2012, 49 (6) : 602-609) discloses a test device for the interaction between molten matter and liquid metal sodium, adopts the electromagnetic induction heating method to obtain the molten matter, and releases the melted material by lifting the alumina sleeve to conduct research on the melting of the molten matter Behavioral characteristics in liquid metal sodium and physical characteristics of fragments; however, the amount of molten material in this experimental device is only on the order of grams, which is very different from the real reactor operating conditions; in addition, graphite crucibles at high temperatures, due to The diffusion characteristics of the molten material will introduce impurities to the molten material, which will affect the test results; and it is impossible to study the influence of the liquid column diameter of the molten material on the fragmentation characteristics of the molten material in liquid metal sodium

[0004] For example, literature (Satoshi Nishimura, Zhi-Gang Zhang, Ken-Ichiro Sugiyama, et al. Transformation and fragmentation behavior of molten metal drop in sodium pool [J]. Nuclear Engineering and Design, 2007, 237: 2201-2209) also discloses a An experimental device for the interaction between melt and liquid metal sodium, which uses electric heating to obtain high-temperature melt, and pours the melt into liquid metal sodium by rotating the crucible of a furnace; but the device requires the crucible to rotate Extremely high, and it is impossible to form a melt liquid column with a certain diameter, and it is impossible to study the influence of the melt liquid column diameter on the fragmentation characteristics of the melt in liquid metal sodium

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