Experimental system and experimental method for combined measurement of convection and dispersion of overburden pore permeability nuclides
An experimental system and nuclide technology, applied in the field of nuclide migration and diffusion measurement experimental system, can solve problems such as difficulty, fragmentation, and poor integrity
Pending Publication Date: 2022-04-05
XI AN JIAOTONG UNIV
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[0004] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide an experimental system and experimental method for joint measurement of nuclide convection and dispersion in overburden pores. ; and when the nuclide diffuses in the simulated medium, it is affected by the complex thermal-hydraulic-mechanical-chemical multi-field coupling factors in the nuclear leakage environment, which makes the design of a complete experimental system encounter difficult technical problems
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Embodiment 1
[0082] Firstly, a sodium chloride aqueous solution with a concentration of 0.05mol / L was prepared as a solution for simulating groundwater, and the core specification was a low-permeability clay rock sample with a length of 90-100 mm and a diameter of 50 mm. Through the vacuum saturation system, use the vacuum pump 18 to evacuate the liquid in the core holder 5 of the simulated formation method. When the pressure gauge shows that the pressure inside the holder is below 0.1MPa, the system has reached a vacuum state. The vacuuming lasts for 24 hours and the confining pressure is the maximum. Increase the pressure to 20MPa and continue to pressurize for 8 hours to saturate the core; first, measure the diffusion parameters by simulating the dispersion situation through the experimental module of the penetrating diffusion method, and then measure the permeability parameters by simulating the convection situation through the experimental module of the simulated formation method. Afte...
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Abstract
The invention discloses an experiment system and an experiment method for combined measurement of convection and dispersion of overburden pore permeability nuclides. The experiment system is mainly divided into a penetration diffusion method experiment module and a stratum simulation method experiment module. The penetration diffusion method experiment module drives a solution to form liquid films at the two ends of a rock core through a multi-channel micro peristaltic pump, the dispersion condition is simulated, a collection bottle is replaced regularly, and the diffusion coefficient and the capacity factor are calculated by fitting the nuclide concentration in the collection bottle; the simulated formation method experiment module is used for vacuumizing and saturating a rock core through a vacuum pump, measuring the mass before and after saturation, calculating the porosity, driving a solution to one end of a clamp holder under simulated formation temperature and pressure conditions, and measuring the liquid outlet amount at an outlet end, so as to obtain permeability data; therefore, a complete nuclide migration rule experimental measurement and experimental research system is formed, and experimental data support is provided for comprehensive analysis of migration rules and characteristics of key nuclides in a geological environment. And meanwhile, reference is provided for factors such as nuclear safety rating of the high-level radioactive repository.
Description
technical field [0001] The invention belongs to the technical field of an experimental system for measuring nuclide migration and diffusion, and in particular relates to an experimental system and an experimental method for joint measurement of nuclide convection and dispersion in overburden pores. Background technique [0002] At present, the amount of radioactive waste produced by the operation of nuclear power plants is increasing day by day. Whether it can be safely and effectively disposed of is related to the future of environmental protection and human health, and has become one of the important factors restricting the sustainable development of the nuclear industry. High-level radioactive waste is usually processed into a solidified body by the nuclear industry and defense departments, put into special storage tanks, and then buried hundreds of meters underground, using multiple barrier systems to block the migration of nuclides. Although the shielding time scale of ...
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IPC IPC(8): G01N13/00G09B25/00
CPCY02E30/30
Inventor 张清民朱浩然蔡梓麒朱康甫邵壮李家明桑耀东陈海铮郭昊轩
Owner XI AN JIAOTONG UNIV