論文

査読有り
2019年10月3日

First-principles calculation of mechanical properties of simulated debris Zr<inf>x</inf>U<inf>1−</inf><inf>x</inf>O<inf>2</inf>

Journal of Nuclear Science and Technology
  • Mitsuhiro Itakura
  • ,
  • Hiroki Nakamura
  • ,
  • Toru Kitagaki
  • ,
  • Takanori Hoshino
  • ,
  • Masahiko Machida

56
9-10
開始ページ
915
終了ページ
921
記述言語
掲載種別
研究論文(学術雑誌)
DOI
10.1080/00223131.2019.1604271

© 2019, © 2019 Atomic Energy Society of Japan. All rights reserved. To elucidate the mechanical properties of fuel debris inside the Fukushima Daiichi Nuclear Power Plant, we use first-principles calculations to evaluate mechanical properties of cubic ZrxU1−xO2, which is a main component of the fuel debris. We focus on the dependence of mechanical properties on the fraction x of zirconium and compare our results with recent experiment of simulated debris, in which dependences of elastic moduli and fracture toughness on the ZrO2 content showed deviation from a simple linear relation. We show that elastic moduli drop at around x = 0.25 and increase again for larger values of x, as has been observed in experiments. The reason of the drop is a softening owing to disordered atomistic structures induced by the solute zirconium atoms. We also find that stress–strain curves for the x = 0.125 case show marked hysteresis owing to the existence of many meta-stable states. We show that this hysteresis leads to slightly increased fracture toughness, but it is not enough to account for the significant increase of fracture toughness observed in experiments.

リンク情報
DOI
https://doi.org/10.1080/00223131.2019.1604271
Scopus
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85064697128&origin=inward
Scopus Citedby
https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85064697128&origin=inward

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