Fuel rod fission product release simulation device and using method thereof

A technology for simulating devices and fission products, used in nuclear power generation, climate sustainability, sealing, etc., can solve the problems of experimental process and measurement difficulty, high experimental cost, and difficulty in accurately simulating physical and chemical phenomena, etc., to improve the laser absorption rate. , Accurate experimental results, ensure the effect of uniform distribution

Active Publication Date: 2020-12-04
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Fuel rod fission product release simulation device and using method thereof
  • Fuel rod fission product release simulation device and using method thereof
  • Fuel rod fission product release simulation device and using method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0054] This embodiment proposes a fuel rod fission product release simulation device. Such as figure 1 As shown, the simulation device of this embodiment is mainly composed of three parts: a heating furnace 1 , a crucible 2 , and a fuel rod simulation body 3 .

[0055] Such as figure 2 As shown, the heating furnace 1 of the present embodiment is composed of a heating furnace cover 1-2 and a heating furnace body 1-4.

[0056] The interior of the heating furnace body 1-4 is arranged with graphite barrel heaters 1-5, and the exterior is a composite insulation layer composed of hard felt and soft felt. A gas inlet 1-6 is provided at the bottom of the heating furnace body 1-4, and gas sampling ports 1-3 are arranged at different heights on the side wall.

[0057] The external gas circulation system constructs the internal heating atmosphere of the heating furnace body 1-4 through the gas inlet 1-6, and the elements released into the gas space by the fuel rod simulation body can...

Embodiment 2

[0065] In this embodiment, the simulation device proposed in the above-mentioned embodiment 1 is applied to the experimental research on the release characteristics of fuel rod fission products under severe accident conditions of different reactor types and different burn-up nuclear reactors.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C17/00G21C1/00
CPCG21C17/001G21C1/00Y02E30/30
Inventor 胡钰文宫厚军杨祖毛李朋洲卓文彬昝元锋李勇黎阳
Owner NUCLEAR POWER INSTITUTE OF CHINA
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