Irradiation-induced recrystallization in high burnup UO2 fuel

Kazuhiro Nogita, K. Une

研究成果: ジャーナルへの寄稿記事

97 引用 (Scopus)

抄録

The formation mechanism of recrystallized grains and coarsened bubbles in the peripheral region of a high burnup UO2 pellet has been proposed on the basis of transmission electron microscopy (TEM) results. TEM observations were made on the pellet edge (local burnup: 100 GWd/t) of a fuel sample which had been irradiated to a pellet average burnup of 49 GWd/t in a BWR. A recrystallized grain region was found adjacent to an accumulation region having an extremely high density of dislocations. The dislocations were organized into subdivided grains with high angle boundaries which were regarded as the nuclei for recrystallization. Almost all the coarsened bubbles were surrounded by recrystallized grains. Small intergranular bubbles precipitated on the recrystallized grain boundaries and interconnected with each other, and then linked up with the coarsened bubbles. From these results, it was concluded that the coarsened bubbles were formed by sweeping out of small bubbles during grain growth on recrystallization. Finally an overall formation process for the unique microstructural change, the rim structure, was proposed.

元の言語英語
ページ(範囲)302-310
ページ数9
ジャーナルJournal of Nuclear Materials
226
発行部数3
DOI
出版物ステータス出版済み - 1 1 1995

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bubbles
Irradiation
Transmission electron microscopy
irradiation
Grain growth
pellets
Grain boundaries
transmission electron microscopy
rims
grain boundaries
nuclei

All Science Journal Classification (ASJC) codes

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

これを引用

Irradiation-induced recrystallization in high burnup UO2 fuel. / Nogita, Kazuhiro; Une, K.

:: Journal of Nuclear Materials, 巻 226, 番号 3, 01.01.1995, p. 302-310.

研究成果: ジャーナルへの寄稿記事

Nogita, Kazuhiro ; Une, K. / Irradiation-induced recrystallization in high burnup UO2 fuel. :: Journal of Nuclear Materials. 1995 ; 巻 226, 番号 3. pp. 302-310.
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