Comparison of the thermodynamic databases for radioactive elements in application to the calculation of the solubilities in the porewater

Doi, Reisuke  ; Shibata, Masahiro 

To calculate the solubility of radioactive elements which is the important parameter for assessing performances in geological environments, the thermodynamic database must be reliable and based on the latest information. In this research, we compared the solubilities of the representative radioactive elements in the porewater compositions of the compacted bentonite which were set up in the second progress report (H12). The solubility was calculated with the thermodynamic databases of JAEA, OECD/NEA, Nagra/PSI. And we investigated the causes of the differences among three thermodynamic databases.