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Evaluating the long...
Evaluating the long-term barrier performance of fractured granite for nuclear waste disposal: Impact of fast water-conducting path
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- Hu, Yingtao (author)
- School of Engineering, Hangzhou City University, Hangzhou, 310015, China; Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province, Hangzhou City University, Hangzhou, 310015, China; MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou, 310058, China
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- Xu, Wenjie (author)
- MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou, 310058, China
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- Zou, Liangchao, 1987- (author)
- KTH,Vatten- och miljöteknik
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- Zhan, Liangtong (author)
- MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou, 310058, China
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- Chen, Yunmin (author)
- MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou, 310058, China
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- Wang, Ju (author)
- CNNC Key Laboratory on Geological Disposal of High-level Radioactive Waste, Beijing Research Institute of Uranium Geology, Beijing, 100029, China
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- Dai, Zhenxue (author)
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266520, China
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(creator_code:org_t)
- Elsevier B.V. 2024
- 2024
- English.
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In: Engineering Geology. - : Elsevier B.V.. - 0013-7952 .- 1872-6917. ; 337
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Granite has relatively low-permeability and it has been considered as one of favorable geological formation for final disposal of high-level radioactive waste (HLW). However, the granite is often fractured and characterized as complex discrete fracture-matrix systems with considerable degree of uncertainties in its physical and geometrical properties. Prediction of nuclide migration in fractured granite at large spatial and long temporal scales is important for safety assessment of HLW disposal. In the present study, parametric studies are performed to evaluate the long-term barrier performance of fractured granite using the Beishan granite barrier as an illustration example. As the distance between the fast water-conducting path (FWCP) and the disposal pit decreased from 80 m to 0, the nuclides' arrival time (Tt) in the biosphere decreased from 9000 to approximately 2000 years when the effects of the fault and the FWCP are considered. The maximum nuclide concentration (Cmax) increases from 0.0019 (350,000 years) to 0.0121 mSv/y (150,000 years), exceeding the limit of 0.01 mSv/y. In addition, as the permeability (equivalent hydraulic aperture) of the FWCP increased from 5.0 × 10−5 m to 1.0 × 10−4 m, the Tt of Cs-135 further decreases to about 15,000 years, and the Cmax increases to 0.0256 mSv/y (100,000 years), suggesting a significant reduction in the long-term performance of the geological barrier. These findings are helpful for site assessment of HLW repositories built in fractured granite.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Naturresursteknik -- Geofysisk teknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Environmental Engineering -- Geophysical Engineering (hsv//eng)
Keyword
- Fast water-conducting path
- Fracture-matrix system
- Geological disposal
- Long-term performance
- Nuclide migration
Publication and Content Type
- ref (subject category)
- art (subject category)
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