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

doi:10.1016/j.jnucmat.2008.12.040

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 journal › Article › peer-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 language	English
Pages (from-to)	315-321
Number of pages	7
Journal	Journal of Nuclear Materials
Volume	384
Issue number	3
DOIs	https://doi.org/10.1016/j.jnucmat.2008.12.040
Publication status	Published - 2009 Feb 28
Externally published	Yes

ASJC Scopus subject areas

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

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10.1016/j.jnucmat.2008.12.040

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title = "Temperature accelerated dynamics study of migration process of oxygen defects in UO2",

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.",

author = "Takashi Ichinomiya and Uberuaga, {Blas P.} and Sickafus, {Kurt E.} and Yasumasa Nishiura and Mitsuhiro Itakura and Ying Chen and Yasunori Kaneta and Motoyasu Kinoshita",

note = "Funding Information: This work is financially supported by the Budget for Nuclear Research of the Ministry of Education, Culture, Sports, Science and Technology of Japan, based on the screening and counseling by the Atomic Energy Commission. Work at LANL was funded by the Office of Science, Office of Basic Energy Sciences. Los Alamos National Laboratory is operated by Los Alamos National Security, LLC, for the National Nuclear Security Administration of the US DOE under contract DE-AC52-06NA25396.",

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AU - Ichinomiya, Takashi

AU - Uberuaga, Blas P.

AU - Sickafus, Kurt E.

AU - Nishiura, Yasumasa

AU - Itakura, Mitsuhiro

AU - Chen, Ying

AU - Kaneta, Yasunori

AU - Kinoshita, Motoyasu

N1 - Funding Information: This work is financially supported by the Budget for Nuclear Research of the Ministry of Education, Culture, Sports, Science and Technology of Japan, based on the screening and counseling by the Atomic Energy Commission. Work at LANL was funded by the Office of Science, Office of Basic Energy Sciences. Los Alamos National Laboratory is operated by Los Alamos National Security, LLC, for the National Nuclear Security Administration of the US DOE under contract DE-AC52-06NA25396.

PY - 2009/2/28

Y1 - 2009/2/28

N2 - 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.

AB - 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.

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

Abstract

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