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Speciation on the reaction of uranium and zirconium oxides treated under oxidizing and reducing atmospheres
https://repo.qst.go.jp/records/84931
https://repo.qst.go.jp/records/8493131274e4d-869f-48d3-8cdc-2b031310a82c
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2022-01-12 | |||||
| タイトル | ||||||
| タイトル | Speciation on the reaction of uranium and zirconium oxides treated under oxidizing and reducing atmospheres | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Akihiro, Uehara
× Akihiro, Uehara× Daisuke, Akiyama× Ikeda-Ohno, Atsushi× Chiya, Numako× Yasuko, Terada× Kiyofumi, Nitta× Toshiaki, Ina× Shino, Takeda× Akira, Kirishima× Nobuaki, Sato× Akihiro, Uehara× Shino, Takeda |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Characterization of the fuel debris has been required for decommissioning Fukushima Daiichi Nuclear Power Station. To understand the reaction mechanisms involved for mixed UO 2 –ZrO 2 compounds, these materials were treated at high temperatures (1473 to 1873 K) under oxidizing, inert, and reducing atmo- spheres. The reaction products were analysed by a combination of powder X-ray diffraction (PXRD) and X-ray absorption spectroscopic measurements of the U L III - and Zr K-edges. Principal component analysis of the X-ray absorption near edge structure and extended X-ray absorption fine structure of U L III - and Zr K-edges provided a breakdown of the composition of each species within the products, these results were further supported by PXRD. Under an oxidizing atmosphere, the formation of U 3 O 8 and U 2 Zr 5 O 15 was observed in equilibrium with UO 2 , monoclinic-ZrO 2 , and tetragonal-ZrO 2 . However, when O 2 gas was purged through the reaction tube during the cooling process to room temperature, pentavalent U in ZrU 2 O 7 was produced by the oxidation of solid solution UO 2 formed at > 1774 K during the tempera- ture dropped at < 1473 K. Under the inert atmosphere, mixed oxides of uranium were found to form at > 1673 K due to a low concentration of O 2 impurity with the Ar gas. Although the oxidized UO 2 was able to form in such a system, tetravalent UO 2 and its solid solution were instead present throughout the whole temperature range examined under a reducing atmosphere (H 2 gas). This study can pave the way for understanding the interaction between the nuclear fuels and the cladding materials in damaged reactors enabling further simulation of possible decontamination procedures. | |||||
| 書誌情報 |
Journal of Nuclear Materials 巻 559, p. 153422, 発行日 2021-11 |
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| 出版者 | ||||||
| 出版者 | Elsevier | |||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 0022-3115 | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1016/j.jnucmat.2021.153422 | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://www.sciencedirect.com/science/article/pii/S0022311521006425 | |||||
