Application of the sorption database to K-setting for Horonobe rocks

Ochs, M.*; Kunze, S.*; Saito, Yoshihiko; Kitamura, Akira  ; Tachi, Yukio  ; Yui, Mikazu

In the present report, a first test and illustration was performed regarding the applicability of the JNC-SDB to the derivation of K-values for Th, Np, Cs, and Se valid for Horonobe rocks. The original experimental data selected from the JNC-SDB were converted to the application conditions using the semi-quantitative scaling procedures. To illustrate the effect of the scaling procedures, and of related uncertainties, on the magnitude of the derived K-values, scaling procedures taking into account mineralogy as well as surface and solution speciation were applied sequentially, and all results were discussed in detail. This K-setting exercise allowed to predict the magnitude of K values under the in-situ conditions, however the availability of experimental data that closely match the application conditions is limited for some reasons.