Abstract
Deep geological disposal of high-level radioactive waste is a feasible method for solving the problem of spent fuel storage in China. High-level radioactive waste releases heat during the decay process, which increases the temperature of the surrounding rock in the repository, resulting in a significant increase in radon concentration. In this study, the surrounding rock (granite) of a high-level radioactive waste repository was taken as the research object and, based on the similarity principle, an orthogonal test designed. Similar materials of uranium-containing granite were prepared in the laboratory and the physical and mechanical properties and cumulative radon concentration of granite samples assessed under different temperatures (25, 50, 100, 150, and 200 °C). The results showed that, with increased temperature, the compressive and tensile strengths of samples gradually increased and their pore volume gradually decreased. After heat treatment, the longitudinal wave velocity and thermal conductivity of samples decreased linearly with increased temperature. The radon exhalation rate first increased and then decreased, with the rate reaching a maximum at 100 °C. The radon exhalation rate of single-sided and double-sided samples was 0.00914 and 0.00460 Bq·m−2·s−1, respectively. When the temperature was 25–100 °C, the dominant stage was pore water. The radon exhalation rates of samples were positively correlated with compressive and tensile strengths and negatively correlated with pore volume, longitudinal wave velocity, and thermal conductivity. The temperature of 100–200 °C was range of the dominant stage of pore structure. The conclusions obtained in this study can provide theoretical support for radon reduction and radon control of granite in high temperature environments.
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Funding
This research was supported by the Hunan Provincial Natural Science Foundation of China (grant nos. 2021JJ30572 and 2021JJ30206), the Research Foundation of Education Bureau of Hunan Province, China (grant no. 20A422), Hunan Provincial Innovation Foundation for Postgraduate, China (grant no. CX20210924), the Open Fund Project of Hunan Engineering Research Center for Uranium Exploration Technology (grant no. 2021HSKFJJ045), and the Innovation and Entrepreneurship Training Program for College Students in China (grant no. 202211528113) and the Innovation and Entrepreneurship Training Program for College Students in Hunan Province, China (grant no. S202211528055).
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Fuliang Jiang put forward the experimental scheme, guided the experiment, and guided the writing of the thesis. Yuying Hao carried out the field the experiments and completed the draft paper. Biao Tan, Chao Zhang, Mian Zhang, Haoyu Li and Xiaotong Yang participated in the field experiment. Yixiang Mo, Tao Hu, Shiyan Li and Huiting He participated in the discussion of the draft paper. All authors contributed to the writing of the manuscript and approved the final manuscript.
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Hao, Y., Jiang, F., Tan, B. et al. Study on damage evolution and radon exhalation of uranium-bearing granite under high temperature. Environ Sci Pollut Res 30, 35223–35237 (2023). https://doi.org/10.1007/s11356-022-24740-9
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DOI: https://doi.org/10.1007/s11356-022-24740-9