K setting approach through semi-quantitative estimation procedures and thermodynamic sorption models; A Case study for Horonobe URL conditions

Tachi, Yukio  ; Ochs, M.*; Suyama, Tadahiro; Trudel, D.*

Sorption of radionuclides (K) in host rocks depends critically on relevant geochemical conditions, need to correspond to the specific performance assessment (PA) conditions. The integrated approaches for site-specific K setting have been developed focusing two transferring procedures, semi-quantitative estimation procedures and thermodynamic sorption models. The present paper focused on illustrating the derivation of K values and their uncertainties of Cs, Ni, Am and Th for geochemical conditions from the Horonobe URL. These K-setting results were compared with the measured K values, indicating that the magnitude of sorption can be quantitatively evaluated when adequate data and models were available. These comparative discussions between transferring procedures and measured data are effective to enhance the reliability of K setting, and the careful selections from transferred results are needed according to the situation in the existing data and process understanding.