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Sugiura, Yuki; Suyama, Tadahiro*; Tachi, Yukio
JAEA-Data/Code 2021-017, 58 Pages, 2022/03
JAEA-Data-Code-2021-017.pdf:1.98MB
Sorption behavior of radionuclides (RNs) in buffer materials (bentonites), rocks and cementitious materials is one of the key processes in a safe geological disposal of radioactive waste because RNs migration in these materials is expected to be retarded by the sorption process. Therefore, it is necessary to understand the sorption process and develop a database compiling reliable data and mechanistic/predictive models so that reliable parameters can be set under a variety of geochemical conditions relevant to a performance assessment (PA). For this purpose, Japan Atomic Energy Agency (JAEA) has developed the database of sorption parameters in bentonites, rocks and cementitious materials. This sorption database (SDB) was firstly developed as an important basis for the H12 PA of a high-level radioactive waste disposal, and have been provided through the Web. JAEA has continued to improve and update the SDB in the view of potential future needs of data focusing on assuring the desired quality level and testing the usefulness of the databases for possible applications to the PA-related parameter setting. This report focuses on updating of the sorption database (JAEA-SDB) as a basis of integrated approach for the PA-related distribution coefficient (Kd) setting and development of mechanistic sorption models. This report also includes an overview of the database structure and contents. Kd data and their quality assurance (QA) results were updated from literature collected with wider ranges. As a result, 8,503 Kd data from 70 references related to the above-mentioned systems were added and the total number of Kd values in JAEA-SDB reached 79,072. The QA/classified Kd data reached about 75.4% for all Kd data in JAEA-SDB. The updated JAEA-SDB is expected to make it possible to give a basis for the next-step PA-related Kd setting.
Mei, H.; Aoyagi, Noboru; Saito, Takumi*; Kozai, Naofumi; Sugiura, Yuki; Tachi, Yukio
Applied Geochemistry, 136, p.105178_1 - 105178_8, 2022/01
Times Cited Count：11 Percentile：90.47(Geochemistry & Geophysics)Sugiura, Yuki; Ishidera, Takamitsu; Tachi, Yukio
Applied Clay Science, 200, p.105910_1 - 105910_10, 2021/01
Times Cited Count：8 Percentile：56.97(Chemistry, Physical)Sugiura, Yuki; Tomura, Tsutomu*; Ishidera, Takamitsu; Doi, Reisuke; Francisco, P. C. M.; Shiwaku, Hideaki; Kobayashi, Toru; Matsumura, Daiju; Takahashi, Yoshio*; Tachi, Yukio
Journal of Radioanalytical and Nuclear Chemistry, 324(2), p.615 - 622, 2020/05
Times Cited Count：4 Percentile：44.4(Chemistry, Analytical)Sugiura, Yuki; Suyama, Tadahiro*; Tachi, Yukio
JAEA-Data/Code 2019-022, 40 Pages, 2020/03
JAEA-Data-Code-2019-022.pdf:2.22MB
Sorption behavior of radionuclides (RNs) in buffer materials, rocks and cementitious materials is one of the key processes in a safe geological disposal. This report focuses on updating of JAEA sorption database (JAEA-SDB) as a basis of integrated approach for the performance assessment (PA)-related distribution coefficient (K
) setting and development of mechanistic sorption models. K data and their quality assurance (QA) results were updated by focusing on the following systems as potential needs extracted from our recent activities on the K setting and development of mechanistic models, i.e., clay minerals, sedimentary rocks and cementitious materials. As a result, 6,702 K data from 60 references were added and the total number of K values in JAEA-SDB reached 69,679. The QA/classified K data reached about 72% for all K data in JAEA-SDB.
Sugiura, Yuki; Suyama, Tadahiro*; Tachi, Yukio
JAEA-Data/Code 2017-016, 54 Pages, 2018/03
JAEA-Data-Code-2017-016.pdf:2.06MB
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
setting and mechanistic sorption model development. This includes an overview of database structure and contents. K data and their QA results are updated by focusing our recent activities on the K setting and mechanistic model development. As a result, 4,256 K data from 30 references were added, total number of K values in the JAEA-SDB reached about 63,000. The QA/classified K data reached about 69% for all K 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 setting in effective, traceable and transparent manner.
Sugiura, Yuki; Tomura, Tsutomu*; Doi, Reisuke; Ishidera, Takamitsu; Tachi, Yukio
no journal, ,
Sugiura, Yuki; Tachi, Yukio; Suyama, Tadahiro*; Hamamoto, Takafumi*
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no abstracts in English
Sugiura, Yuki; Ishidera, Takamitsu; Suyama, Tadahiro*; Okazaki, Mitsuhiro*; Hamamoto, Takafumi*; Ishida, Keisuke*; Tachi, Yukio
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Sugiura, Yuki; Ishidera, Takamitsu; Tachi, Yukio
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Dei, Shuntaro; Miyakawa, Kazuya; Sasamoto, Hiroshi; Tachi, Yukio; Amano, Yuki; Francisco, P. C. M.; Sugiura, Yuki; Takahashi, Yoshio*
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no abstracts in English
Matsui, Naoki*; Okubo, Takahiro*; Tachi, Yukio; Sugiura, Yuki; Yotsuji, Kenji*
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no abstracts in English
Mei, H.; Aoyagi, Noboru; Saito, Takumi*; Kozai, Naofumi; Sugiura, Yuki; Tachi, Yukio
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Matsui, Naoki*; Okubo, Takahiro*; Tachi, Yukio; Yotsuji, Kenji*; Sugiura, Yuki
no journal, ,
no abstracts in English
Dei, Shuntaro; Tachi, Yukio; Amano, Yuki; Francisco, P. C. M.; Sugiura, Yuki; Takahashi, Yoshio*
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no abstracts in English
Tachi, Yukio; Yotsuji, Kenji*; Fukatsu, Yuta; Sugiura, Yuki; Okubo, Takahiro*
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Understanding the radionuclide migration in clay minerals contained in the buffer material bentonite and rocks is important for the safety assessment of geological disposal of radioactive waste. The pore structures and the electrostatic interactions at the surface, formed by the clay mineral with a layered structure, are key components for developing the radionuclide migration model in clay minerals. In this study, in order to evaluate the influence of alteration from Na- to Ca-montmorillonite on radionuclide migration, the diffusion and sorption model was developed by considering the effects of both pore structures and electrostatic interactions in the compacted montmorillonite.
Sugiura, Yuki; Ishidera, Takamitsu; Aoyagi, Noboru; Mei, H.; Saito, Takumi*; Tachi, Yukio
no journal, ,
Dei, Shuntaro; Tachi, Yukio; Amano, Yuki; Sugiura, Yuki; Francisco, P. C. M.; Takahashi, Yoshio*
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Mei, H.; Aoyagi, Noboru; Saito, Takumi*; Sugiura, Yuki; Ishidera, Takamitsu; Tanaka, Kazuya; Tachi, Yukio
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