The shotclay method is construction method of the high density bentonite engineered barrier by spraying method. Using this method, the dry density of 1.6 Mg/m3, which was considered impossible with the spray method, is achieved. In this study, the applicability of the shotclay method to HLW bentonite-engineered barriers was confirmed experimentally. In the tests, an actual scale vertical-type HLW bentonite-engineered barrier was constructed. This was a bentonite-engineered barrier with a diameter of 2.22 m and a height of 3.13 m. The material used was bentonite with 30% silica sand, and water content was adjusted by mixing chilled bentonite with powdered ice before thawing. Work progress was 11.2 m3 and the weight was 21.7 Mg. The dry density of the entire buffer was 1.62 Mg/m3, and construction time was approximately 8 hours per unit. After the formworks were removed, the core and block of the actual scale HLW bentonite-engineered barrier were sampled to confirm homogeneity. As a result, homogeneity was confirmed, and no gaps were observed between the formwork and the buffer material and between the simulated waste and the buffer material. The applicability to HLW of the shotclay method has been confirmed through this examination.
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ASME 2010 13th International Conference on Environmental Remediation and Radioactive Waste Management
October 3–7, 2010
Tsukuba, Japan
Conference Sponsors:
- Nuclear Engineering Division and Environmental Engineering Division
ISBN:
978-0-7918-5453-2
PROCEEDINGS PAPER
Design Options for HLW Repository Operation Technology: Part IV—Shotclay Technique for Seamless Construction of EBS
Ichizo Kobayashi,
Ichizo Kobayashi
Kajima Corporation, Chofu, Tokyo, Japan
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Soh Fujisawa,
Soh Fujisawa
Kajima Corporation, Chofu, Tokyo, Japan
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Makoto Nakajima,
Makoto Nakajima
Kajima Corporation, Chofu, Tokyo, Japan
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Masaru Toida,
Masaru Toida
Kajima Corporation, Chofu, Tokyo, Japan
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Hitoshi Nakashima,
Hitoshi Nakashima
Radioactive Waste Management Funding and Research Center, Tokyo, Japan
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Hidekazu Asano
Hidekazu Asano
Radioactive Waste Management Funding and Research Center, Tokyo, Japan
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Ichizo Kobayashi
Kajima Corporation, Chofu, Tokyo, Japan
Soh Fujisawa
Kajima Corporation, Chofu, Tokyo, Japan
Makoto Nakajima
Kajima Corporation, Chofu, Tokyo, Japan
Masaru Toida
Kajima Corporation, Chofu, Tokyo, Japan
Hitoshi Nakashima
Radioactive Waste Management Funding and Research Center, Tokyo, Japan
Hidekazu Asano
Radioactive Waste Management Funding and Research Center, Tokyo, Japan
Paper No:
ICEM2010-40236, pp. 451-458; 8 pages
Published Online:
April 5, 2011
Citation
Kobayashi, I, Fujisawa, S, Nakajima, M, Toida, M, Nakashima, H, & Asano, H. "Design Options for HLW Repository Operation Technology: Part IV—Shotclay Technique for Seamless Construction of EBS." Proceedings of the ASME 2010 13th International Conference on Environmental Remediation and Radioactive Waste Management. ASME 2010 13th International Conference on Environmental Remediation and Radioactive Waste Management, Volume 2. Tsukuba, Japan. October 3–7, 2010. pp. 451-458. ASME. https://doi.org/10.1115/ICEM2010-40236
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