Compactification of geological disposal system based on dynamics of groundwater saturation processes

2015 Fiscal Year Final Research Report

• Project/Area Number: 25630425
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Nuclear engineering
• Research Institution: Tohoku University
• Principal Investigator: Niibori Yuichi 東北大学, 工学(系)研究科(研究院), 教授 (90180562)
• Co-Investigator(Kenkyū-buntansha): CHIDA TAIJI 東北大学, 大学院工学研究科, 助教 (30415880)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 地層処分 / 放射性廃棄物 / 原子力エネルギー / 不飽和帯 / 冠水過程

Outline of Final Research Achievements

This study examined the groundwater saturation processes,in order to compact the geological disposal system, by using the micro-flow cell and the packed bed. Here, high alkaline groundwater due to cement utilization was also considered. As the result, the saturation processes depended on not the mass transfer rate of gas component from gas phase to liquid phase but the diffusion of dissolved gas in groundwater and/or the mixing of the groundwater itself. Besides, considering the permeability distribution due to residual gas, this study calculated the underground area required for the disposal of vitrified radioactive waste, by using a numerical model. The results suggested a compacted case 10% smaller than the area of the present design. Furthermore, the future issues were also discussed.

Free Research Field

工学