Development of realistic glass dissolution model; Coupling chemical reaction and diffusive transport near the glass surface

松原 竜太*; 石黒 勝彦*; 石田 圭輔*; 稲垣 八穂広*; 大窪 貴洋*; 岩田 孟 

Matsubara, Ryuta*; Ishiguro, Katsuhiko*; Ishida, Keisuke*; Inagaki, Yaohiro*; Okubo, Takahiro*; Iwata, Hajime

NUMO has been developing a more realistic glass dissolution model incorporating the coupling of chemical reaction in groundwater and ionic transport through the alteration layer were implemented by using GoldSim and PhreeqC codes. NUMO has been conducting three joint studies with universities and Japan Atomic Energy Agency to further develop the model. Molecular Dynamics simulations are employed to understand the formation mechanisms of the alteration layer and ionic transport within the layer. Micro-Channel Flow Through (MCFT) tests have been performed to comprehend the relationships between the characteristics of the alteration layer, solution conditions (composition, pH, temperature) and the glass dissolution rate. Long-term (up to ca. 10 years) immersion tests have also been conducted to validate our realistic model. In this presentation, we will explain the progress of model development with the recent results of the joint studies.