Study on the residence time of deep groundwater for high-level radioactive waste geological disposal |
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| Authors: | ZHOU Zhi-chao WANG Ju SU Rui GUO Yong-hai LI Jie-biao JI Rui-li ZHANG Ming DONG Jian-nan |
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| Institution: | 1Beijing Research Institute of Uranium Geology, Beijing 100029, China.2CNNC Key Laboratory on Geological Disposal of High-level Radioactive Waste, Beijing 100029, China. 2Key Laboratory of Surficial Geochemistry, Ministry of Education; Department of Hydrosciences, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China. 3East China Geological Exploration Bureau of Nonferrous Metals, Jiangsu Province, Nanjing 210007, China. |
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| Abstract: | Residence time of deep groundwater is one of the most important parameters in safety and performance assessment for high-level radioactive waste geological disposal. In this study, we collected the deep groundwater samples of Jijicao in Gansu Beishan pre-selected region. The deep groundwater residence time at two depths estimated by Helium-4 accumulation method were 3.8 ka and 5.0 ka respectively upon measurement and calculation, which indicates that the deep groundwater is not derived from the deep crust circulation process. Hence, deep groundwater is featured with long residence time as well as slow circulation and update rate, and such features are conductive to the safe disposal of high-level radioactive waste. |
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| Keywords: | Deep groundwater High-level radioactive waste 4He Geological disposal |
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