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Report No.
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Development of JAEA sorption database (JAEA-SDB); Update of sorption/QA data in FY2017

Sugiura, Yuki  ; Suyama, Tadahiro*; Tachi, Yukio  

Sorption and diffusion of radionuclides in buffer materials (bentonites), rocks and cementitious materials are the key processes in the safe geological disposal of radioactive waste, because migration of radionuclides in these barrier materials is expected to be diffusion-controlled and retarded by sorption processes. It is therefore necessary to understand the sorption and diffusion processes and develop databases compiling reliable data and mechanistic/predictive models, so that reliable parameters can be set under a variety of geochemical conditions relevant to performance assessment (PA). The present report focuses on updating of the sorption database (JAEA-SDB) as basis of integrated approach for PA-related K$$_{d}$$ setting and mechanistic sorption model development. This includes an overview of database structure and contents. K$$_{d}$$ data and their QA results are updated by focusing our recent activities on the K$$_{d}$$ setting and mechanistic model development. As a result, 4,256 K$$_{d}$$ data from 30 references were added, total number of K$$_{d}$$ values in the JAEA-SDB reached about 63,000. The QA/classified K$$_{d}$$ data reached about 69% for all K$$_{d}$$ data in JAEA-SDB. The updated JAEA-SDB is expected to make it possible to obtain quick overview of the available data, and to have suitable access to the respective data for PA-related K$$_{d}$$ setting in effective, traceable and transparent manner.

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