Migration behavior of plutonium affected by ferrous ion in compacted bentonite by using electrochemical technique

Daisuke Akiyama, Kazuya Idemitsu, Yaohiro Inagaki, Tatsumi Arima, Kenji Konashi, Shinichi Koyama

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

抄録

The migration behavior of plutonium is expected to be affected by the corrosion products of carbon steel in compacted bentonite at high-level waste repositories. Electrochemical experiments were carried out to simulate the reducing environment created by ferrous iron ions in equilibrium with anoxic corrosion products of iron. The concentration profiles of plutonium could be described by the convection -dispersion equation to obtain two migration parameters: apparent migration velocity Va and apparent dispersion coefficient Da. The apparent migration velocity was evaluated within 1 nm/s and was found to be independent of the experiment duration and the dry density of bentonite in the interval 0.8-1.4 Mg/m3. The apparent dispersion coefficient increased with the experiment duration at a dry density of 1.4 Mg/m3. The results for other dry densities also showed the same trend. These findings indicate that plutonium migration likely starts after ferrous ions reach the plutonium, in other words, the reducing environment due to ferrous ions could change the chemical form of plutonium and/or the characteristics of compacted bentonite. The apparent diffusion coefficient was estimated to be around 0.5 to 2.2 um2/s and increased with decreasing the dry density of bentonite.

本文言語英語
ホスト出版物のタイトルScientific Basis for Nuclear Waste Management XXXVII
編集者Lara Duro, Javier Gimenez, Ignasi Casas, Joan de Pablo
出版社Materials Research Society
ページ79-84
ページ数6
ISBN(電子版)9781605116426
DOI
出版ステータス出版済み - 2014
イベント37th International Symposium on the Scientific Basis for Nuclear Waste Management - Barcelona, スペイン
継続期間: 9 29 201310 3 2013

出版物シリーズ

名前Materials Research Society Symposium Proceedings
1665
ISSN(印刷版)0272-9172

その他

その他37th International Symposium on the Scientific Basis for Nuclear Waste Management
国/地域スペイン
CityBarcelona
Period9/29/1310/3/13

All Science Journal Classification (ASJC) codes

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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