Kinetic simulation of uranium migration in granite fissure media of beishan, gansu, China: A case study based on the Laplace transform and inverse transform methods
Deep geological disposal is currently considered the most practical and feasible method for disposing high-level radioactive wastes (HLWs). One of its key scientific issues is the migration of nuclides in fissure media. However, studies on the migration of nuclides like U-238 are relatively limited....
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Elsevier
2025-02-01
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| Series: | Nuclear Engineering and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1738573324004534 |
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| author | Xianzhe Duan Cong Du Nan Li Jiaxin Duan Zhenping Tang |
| author_facet | Xianzhe Duan Cong Du Nan Li Jiaxin Duan Zhenping Tang |
| author_sort | Xianzhe Duan |
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| description | Deep geological disposal is currently considered the most practical and feasible method for disposing high-level radioactive wastes (HLWs). One of its key scientific issues is the migration of nuclides in fissure media. However, studies on the migration of nuclides like U-238 are relatively limited. In this study, the granite rock masses in Beishan, Gansu were selected to construct a physical and mathematical model of U-238 migration using the Laplace transform and inverse transform methods. Based on the numerical methods, the kinetic migration of nuclide U-238 in the fissure media of granite was simulated, and the effects of parameters such as fissure width, hydraulic gradient, diffusible area ratio and rock porosity on the migration of U-238 were investigated. The following insights were obtained: (1) After 100,000 years, U-238 has a very limited diffusion depth in the matrix domain, with a diffusion range of only a few tens of millimeters, whereas it migrates relatively quickly in the fissure domain, with a maximum migration distance of about 1500 m. (2) Under the same migration time and distance, the relative concentration of nuclide U-238 in the fissure domain increases with larger gap width, hydraulic gradient, and diffusible area ratio, but decreases with higher rock porosity. (3) In the same time range, the rock masses with larger gap widths, hydraulic gradients, and diffusible area ratios have larger migration ranges, while those with higher porosities have smaller migration ranges. (4) While selecting a site for diposal of HLWs, it is recommended to choose rock masses in the granite area of Beishan with no fissures or few fissures; additionally, areas with smaller fissure widths, hydraulic gradients, and diffusible area ratios but higher rock porosity should be prioritized. This study can provide important theoretical support for understanding nuclide migration in the future geological disposal of HLWs. |
| format | Article |
| id | doaj-art-4e34cad896484a5b885b937601053abf |
| institution | Kabale University |
| issn | 1738-5733 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Elsevier |
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| series | Nuclear Engineering and Technology |
| spelling | doaj-art-4e34cad896484a5b885b937601053abf2025-01-31T05:11:07ZengElsevierNuclear Engineering and Technology1738-57332025-02-01572103205Kinetic simulation of uranium migration in granite fissure media of beishan, gansu, China: A case study based on the Laplace transform and inverse transform methodsXianzhe Duan0Cong Du1Nan Li2Jiaxin Duan3Zhenping Tang4School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, China; Hunan Key Laboratory of the Rare Metal Minerals Exploitation and Geological Disposal of Waste, Hengyang 421001, ChinaSchool of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, ChinaHunan Key Laboratory of the Rare Metal Minerals Exploitation and Geological Disposal of Waste, Hengyang 421001, China; School of Chemical Engineering, University of South China, Hengyang 421001, China; Corresponding author. Hunan Key Laboratory of the Rare Metal Minerals Exploitation and Geological Disposal of Waste, Hengyang 421001, China.School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, ChinaSchool of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, China; Hunan Key Laboratory of the Rare Metal Minerals Exploitation and Geological Disposal of Waste, Hengyang 421001, China; Corresponding author. Hunan Key Laboratory of the Rare Metal Minerals Exploitation and Geological Disposal of Waste, Hengyang 421001, China.Deep geological disposal is currently considered the most practical and feasible method for disposing high-level radioactive wastes (HLWs). One of its key scientific issues is the migration of nuclides in fissure media. However, studies on the migration of nuclides like U-238 are relatively limited. In this study, the granite rock masses in Beishan, Gansu were selected to construct a physical and mathematical model of U-238 migration using the Laplace transform and inverse transform methods. Based on the numerical methods, the kinetic migration of nuclide U-238 in the fissure media of granite was simulated, and the effects of parameters such as fissure width, hydraulic gradient, diffusible area ratio and rock porosity on the migration of U-238 were investigated. The following insights were obtained: (1) After 100,000 years, U-238 has a very limited diffusion depth in the matrix domain, with a diffusion range of only a few tens of millimeters, whereas it migrates relatively quickly in the fissure domain, with a maximum migration distance of about 1500 m. (2) Under the same migration time and distance, the relative concentration of nuclide U-238 in the fissure domain increases with larger gap width, hydraulic gradient, and diffusible area ratio, but decreases with higher rock porosity. (3) In the same time range, the rock masses with larger gap widths, hydraulic gradients, and diffusible area ratios have larger migration ranges, while those with higher porosities have smaller migration ranges. (4) While selecting a site for diposal of HLWs, it is recommended to choose rock masses in the granite area of Beishan with no fissures or few fissures; additionally, areas with smaller fissure widths, hydraulic gradients, and diffusible area ratios but higher rock porosity should be prioritized. This study can provide important theoretical support for understanding nuclide migration in the future geological disposal of HLWs.http://www.sciencedirect.com/science/article/pii/S1738573324004534Disposal of high-level radioactive wastes (HLWs)Granite from beishanFissure domainNuclide migrationKinetic simulation |
| spellingShingle | Xianzhe Duan Cong Du Nan Li Jiaxin Duan Zhenping Tang Kinetic simulation of uranium migration in granite fissure media of beishan, gansu, China: A case study based on the Laplace transform and inverse transform methods Nuclear Engineering and Technology Disposal of high-level radioactive wastes (HLWs) Granite from beishan Fissure domain Nuclide migration Kinetic simulation |
| title | Kinetic simulation of uranium migration in granite fissure media of beishan, gansu, China: A case study based on the Laplace transform and inverse transform methods |
| title_full | Kinetic simulation of uranium migration in granite fissure media of beishan, gansu, China: A case study based on the Laplace transform and inverse transform methods |
| title_fullStr | Kinetic simulation of uranium migration in granite fissure media of beishan, gansu, China: A case study based on the Laplace transform and inverse transform methods |
| title_full_unstemmed | Kinetic simulation of uranium migration in granite fissure media of beishan, gansu, China: A case study based on the Laplace transform and inverse transform methods |
| title_short | Kinetic simulation of uranium migration in granite fissure media of beishan, gansu, China: A case study based on the Laplace transform and inverse transform methods |
| title_sort | kinetic simulation of uranium migration in granite fissure media of beishan gansu china a case study based on the laplace transform and inverse transform methods |
| topic | Disposal of high-level radioactive wastes (HLWs) Granite from beishan Fissure domain Nuclide migration Kinetic simulation |
| url | http://www.sciencedirect.com/science/article/pii/S1738573324004534 |
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