Development of realistic nuclide migration model using reactive transport / particle tracking simulations for TRU waste geological repository

TRU廃棄物の地層処分における反応輸送及び粒子追跡線解析を用いた現実的な核種移行モデルの開発

小池 彩華*; 吉田 芙美子*; 三原 守弘  

Koike, Ayaka*; Yoshida, Fumiko*; Mihara, Morihiro

NUMO developed a near-field radionuclide migration model for assessing the safety of a deep geological repository (DGR) for TRU waste. Previous models conservatively represented the region inside the disposal tunnel structure as a high-permeability porous medium due to uncertainties regarding long-term cementitious material evolution. In this study, NUMO updated these models to represent the long-term evolution of cementitious materials filled within / between waste packages more realistically. This means that the importance of realistically evaluating the evolution of cementitious materials to demonstrate the confidence in the safety of DGR.