グリムゼル花崗閃緑岩の単一割れ目中の核種移行特性評価,3; 解析評価

Radionuclide migration in single fracture of granodiorite at Grimsel Test Site, 3; Modelling

伊藤 剛志; 舘 幸男  

Ito, Tsuyoshi; Tachi, Yukio

花崗岩割れ目中における核種移行モデルの確証に資するため、スイスグリムゼル原位置試験場から採取した単一割れ目を含む花崗閃緑岩試料を対象に実施した定流量通液試験結果について、拡散試験等から得られた収着・拡散特性、割れ目及びその近傍の鉱物・間隙分析の情報をもとに、割れ目からマトリクスにかけての不均質構造や割れ目中の流れの不均質性等を考慮したモデル解釈を試みた。

To validate radionuclide migration model in single fracture in crystalline rocks, the migration behaviors of tracers including HDO, Cs, I measured by flow-through experiment using the granodiorite sample with single fracture from the Grimsel Test Site in Switzerland were modelled. The model was developed considering the heterogeneous distribution of minerals and pores near fracture surface and heterogeneous flow in fracture, based on sorption and diffusion properties obtained by the diffusion experiments and quantitative analysis of minerals and pore distribution in fracture and matrix parts.