Device and method for high temperature melt growth choking experiment

Abstract

The invention provides a device and method for a high temperature melt growth choking experiment. The device comprises a heating oven which comprises an oven body made of zirconia with a cylindrical structure. A ring of a high temperature heat insulation layer is placed in the oven body around the inner wall. The side wall of the oven body is provided with several transparent windows in which thermal couples are installed. Several test bars are placed vertically at the center of the oven body. Each test bar comprises a tungsten rhenium heating bar located in the center. The outer side of the tungsten rhenium heating bar is an alumina layer. The outer side of the alumina layer is a zirconium 4 alloy layer. A transformer is mounted below the heating oven, and is connected with the tungsten rhenium heating bars. Through the implementation of electrical heating to the tungsten rhenium heating bars, the fuel rod decay heat can be simulated. The maximum heating temperature during experiment can reach 2000 DEG C, therefore, the faithful simulation of the melting of core material and the migration and choking characteristics of the high temperature melts of over 2000 DEG C are achieved. The arrangement of several visualization transparent windows at the side of the oven body can dynamically expound the behavioral mechanism of the melting of core material and the migration of melt.

Description

technical field [0001] The invention belongs to the technical field of experimental devices, and in particular relates to an experimental device and an experimental method for expanding congestion of high-temperature molten matter. Background technique [0002] Severe accidents are a complex physical and chemical process with multiple phases and components. The melting of core fuel assemblies and the expansion and melting process of molten materials in the gaps of the rod bundle channels in the reactor are important early behavior sequences of severe accidents, which have great Large uncertainty and difficult to accurately predict. [0003] The international research on fuel melting and candle melting in severe accidents can be traced back to the 1960s, when the nuclear power industry was just emerging. However, because in the countries using nuclear power at that time, it was not necessary to conduct relevant research to obtain a nuclear power license, so the relevant rese...

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Problems solved by technology

[0005] Based on domestic and foreign studies on the melting of core materials and the migration behavior of melts after severe accidents, it can be found that: 1) Due to the physical and chemical processes involving multi-phase and multi-components, the uncertainty of the melting of core materials and the migration behavior of melts is very large. The research conditions and conclusions of various researchers are quite different; 2) the existing system program models and mechanism analysis models have a large number of simplified assumptions, and the applicability of the existing models is very limited; 3) the conventional numerical It is difficult for simulation methods to handle such complex multiphase multiphysics behavior

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