High resolution TEM of high burnup UO2 fuel

Kazuhiro Nogita, K. Une

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

High-resolution TEM (HRTEM) observations and nano-area EDX analyses were carried out on small intragranular bubbles in the outer region of high burnup UO2 pellets. Sample was prepered from the outer region of UO2 pellet, which had been irradiated to the pellet average burnups of 49 GWd/t in a BWR. HRTEM observations and element analyses were made with a 200 KV cold-type field emission TEM (Hitachi FE-2000) having an ultra-thin window EDX (Noran Voyager). Lattice image and nano-area EDX results indicate the presence of 4-8 nm size Xe-Kr bubbles along with fission products of five metal particles, Mo-Tc-Ru-Rh-Pd. Nano-diffraction patterns from bubbles show two different new patterns besides matrix UO2. From the Xe/U proportion obtained by nano-area EDX peak and nano-diffraction patterns from bubbles, it was concluded that Xe in the small bubbles was present in a solid or near solid state at very high pressure. Furthermore, from the results of high resolution images and diffractions obtained from recrystallized grains in rim structure region, neighboring recrystallized grains were clarified to be present with high angle grain boundaries.

Original languageEnglish
Pages (from-to)244-249
Number of pages6
JournalJournal of Nuclear Materials
Volume250
Issue number2-3
DOIs
Publication statusPublished - Jan 1 1997

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Energy dispersive spectroscopy
bubbles
Transmission electron microscopy
transmission electron microscopy
pellets
high resolution
Diffraction patterns
diffraction patterns
Fission products
Image resolution
Field emission
fission products
metal particles
Grain boundaries
rims
Diffraction
Metals
field emission
proportion
grain boundaries

All Science Journal Classification (ASJC) codes

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

Cite this

High resolution TEM of high burnup UO2 fuel. / Nogita, Kazuhiro; Une, K.

In: Journal of Nuclear Materials, Vol. 250, No. 2-3, 01.01.1997, p. 244-249.

Research output: Contribution to journalArticle

Nogita, Kazuhiro ; Une, K. / High resolution TEM of high burnup UO2 fuel. In: Journal of Nuclear Materials. 1997 ; Vol. 250, No. 2-3. pp. 244-249.
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