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- Material Type
- 規格・テクニカルリポート類
- Author/Editor
- 棚井 憲治山本 幹彦関 義孝
- Publication Date
- 2007-07
- Publication Date (W3CDTF)
- 2007
- Alternative Title
- Sensitivity analysis on gas migration in underground repository system for TRU waste
- Periodical title
- JAEA-Research 2007-057
- Target Audience
- 一般
- Note (General)
- 出版タイプ： NA放射性廃棄物処分場内では金属の腐食等によって発生するガスにより、処分場内の地下水が排出される、あるいは処分場内の圧力が上昇する可能性が指摘されている。これにより、生物圏に至るバリア中での放射性核種の移行や人工バリア又は岩盤の構造力学的安定性に影響を与える可能性があり、長期的な処分の安全性に及ぼす影響が懸念される。このような問題点を踏まえて、今後のモデル開発及びデータ取得計画に資するために、気液2相流モデルを用いて処分システム中のガス移行について感度解析を行い、各パラメータの影響度に関する検討を行った。その結果、廃棄体/充填材(セメント系材料)に対しては、絶対透過係数及び残留間隙水飽和度の影響が大きく、緩衝材に対してはガスの絶対透過係数,毛管排除圧及び残留間隙水飽和度の影響が大きいことが明らかになった。In underground repositories for radioactive waste, significant quantities of gases may be generated as a result of metal corrosion. These gases may migrate through the engineered barrier system and the geological barrier. The potential impact of gas generation, accumulation and migration on the performances of the various barriers such as drainage of contaminated water from the repository and/or damaging of the engineered barriers due to a gas over-pressure should be assessed. The sensitivity analysis was carried out using the modified TOUGH2 model in order to clarify the impact of any input parameters. The following facts became clear as a result of this study. For the cementitious material (waste/cementitious filler), an impact of the absolute permeability and residual pore-water saturation was large. For the buffer material, absolute permeability of gas, capillary exclusion pressure and residual pore-water saturation was large.
- Source
- /JAEA-Research-2007-057.pdf （fulltext）