Temperature accelerated dynamics study of migration process of oxygen defects in UO2

Takashi Ichinomiya, Blas P. Uberuaga, Kurt E. Sickafus, Yasumasa Nishiura, Mitsuhiro Itakura, Ying Chen, Yasunori Kaneta, Motoyasu Kinoshita

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

We studied the migration dynamics of oxygen point defects in UO2 which is the primary ceramic fuel for light-water reactors. Temperature accelerated dynamics simulations are performed for several initial conditions. Though the migration of the single interstitial is much slower than that of the vacancy, clustered interstitial shows faster migration than those. This observation gives us important insight on the formation mechanism of high-burnup restructuring, including planar defects and grain sub-division (the rim structure), found in UO2.

Original languageEnglish
Pages (from-to)315-321
Number of pages7
JournalJournal of Nuclear Materials
Volume384
Issue number3
DOIs
Publication statusPublished - 2009 Feb 28

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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