Recovery and restructuring induced by fission energy ions in high burnup nuclear fuel

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:267

Article; Proceedings Paper

Kinoshita, M.^1,2,3  Yasunaga, K.⁴  Sonoda, T.²  Iwase, A.⁵  Ishikawa, N.¹  Sataka, M.¹  Yasuda, K.⁴  Matsumura, S.⁴  Geng, H. Y.³  Chen, Y.³  Kaneta, Y.³  Iwasawa, M.²  Ohnuma, T.²  Nishiura, Y.⁶  Nakamura, J.¹  Matzke, Hj.⁷ 

[1] JAEA Japan Atom Energy Agcy, Tokai, Ibaraki 3191195, Japan

[2] Cent Res Inst Elect Power Ind, Komae, Tokyo 2018511, Japan

[3] Univ Tokyo, Sch Engn, Bunkyo Ku, Tokyo 1138656, Japan

[4] Kyushu Univ, Fac Engn, Nishi Ku, Fukuoka 8190395, Japan

[5] Osaka Prefecture Univ, Dept Mat Sci, Naka Ku, Osaka 5998531, Japan

[6] Hokkaido Univ, RIES, Kita Ku, Sapporo, Hokkaido 0600819, Japan

[7] Commiss European Communities, Joint Res Ctr, Inst Transuranium Elements, Acad Ceram, D-7500 Karlsruhe, Germany

关键词: Nuclear fuel;    Recovery;    Rim structure;    High burnup;    Light water reactor;   

DOI  :  10.1016/j.nimb.2009.02.022

来源: Elsevier

【 摘 要 】

In light water commercial reactors, extensive change of grain structure was found at high burnup ceramic fuels. The mechanism is driven by bombardment of fission energy fragments and studies were conducted by combining accelerator based experiments and computer-science. Specimen of CeO2 was used as simulation material of fuel ceramics. With swift heavy ion (Xe) irradiation on CeO2, with 210 MeV, change of valence charge and lattice deviation of cations were observed by XPS and XRD. Combined irradiations of Xe implantation and swift heavy ion irradiation successfully produced sub-micrometer sized sub-grains, similar as that observed in commercial fuels. Studying components of mechanism scenarios, with first principle calculations using the VASP code, we found stable hyper-stoichiometric defect structures of UO2+x. Molecular dynamics studies revealed stability of Xe planar defects and also found rapid transport mode of oxygen-vacancy clusters. (C) 2009 Published by Elsevier B.V.

【 授权许可】

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