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Recovery and restructuring induced by fission energy ions in high burnup nuclear fuel |
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| Authors: | M. Kinoshita K. Yasunaga A. Iwase M. Sataka S. Matsumura T. Ichinomiya Y. Kaneta T. Ohnuma J. Nakamura |
| Affiliation: | a JAEA Japan Atomic Energy Agency, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195, Japan b Central Research Institute of Electric Power Industry, 2-11-1 Iwadokita, Komae-shi, Tokyo 201-8511, Japan c School of Engineering, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan d Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka-shi 819-0395, Japan e Dept. of Material Science, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Osaka 599-8531, Japan f Research Institute for Electronic Science (RIES), Hokkaido University, Kitaku, Sapporo City 060-0819, Japan g Academy of Ceramics, Institute of Trans-Uranium Elements, Karlsruhe, Germany |
| Abstract: | 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. |
| Keywords: | 25.70 28.41.Bm |
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