Fuel rod fission product release simulation device and using method thereof

Abstract

The invention discloses a fuel rod fission product release simulation device and a using method thereof. The simulation device comprises a heating furnace, a crucible and a fuel rod simulator, whereinthe fuel rod simulator is used for simulating a cladding and a pellet of a prototype fuel element; the crucible is used for supporting the fuel rod simulator and providing a gas circulation flow channel at the same time, the crucible can contain liquid melt when the fuel rod simulator is molten, and the melt is prevented from damaging the heating furnace; and the heating furnace is used for heating the fuel rod simulator. The invention provides a fission product release characteristic experimental device which does not contain radioactive isotopes and has a structure similar to that of a realfuel rod in physical and chemical processes for a fission product release characteristic experiment, and the fission product release characteristic experimental device can be used for researching release characteristics of various fission products with different reactor types and different serious burnup accidents.

Description

technical field [0001] The invention belongs to the technical field of severe accident experimental equipment, and in particular relates to a fuel rod fission product release simulation device applied under severe accident conditions and a use method thereof. Background technique [0002] Under normal operating conditions of a nuclear reactor, after neutron irradiation, fission products will gradually accumulate in the uranium dioxide grains in the fuel rods, and the fission gases will continue to diffuse to the grain boundaries and gradually accumulate between the fuel pellets and the cladding. in the air gap between. When a serious accident occurs in a nuclear reactor, the cladding of the fuel rod is ruptured, part of the fission gas is released to the outside of the fuel rod through the breach, and most of the fission products are still contained in the fuel pellets. As the temperature of the fuel rod continues to rise, the volatile fission products dissolved in the matr...

AI Technical Summary

Problems solved by technology

After investigation, the current international experimental devices for the study of the release characteristics of fission products in severe accidents mainly use irradiated real materials or simulated materials for research. It is carried out in the laboratory, which makes the experimental process and measurement very difficult, and at the same time leads to high experimental costs

However, it is difficult to accurately simulate the complex physical and chemical phenomena in the release process of fission products by using isotopes to simulate the release characteristics of fission products.

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