Hyperstoichiometric regions as potential short-circuit paths for oxygen diffusion in the unrestructured regions of irradiated UO$sub 2$ and (U,Pu)O$sub 2$ nuclear fuel elements
Journal Article
·
· J. Nucl. Mater., v. 57, no. 2, pp. 212-220
OSTI ID:4101351
The relative concentrations of oxygen in the unrestructured regions of several irradiated fuel elements of the composition (U,Pu)O/sub 2-x/ have been measured by electron microprobe methods. Fluctuations were found between closely spaced points, which indicate that hyperstoichiometric diffusion paths may well be formed and may greatly facilitate oxygen transport from the interior to the edge of the elements. In some cases, average expected radial oxygen gradients were computed for the unrestructured regions, using literature data. The results indicate that a very small excess of oxygen, above the stoichiometric amount, is sufficient to account for the observed transport. (NL)
- Research Organization:
- Wisconsin Univ., Milwaukee (USA). Dept. of Chemistry); (Argonne National Lab., Ill. (USA)
- NSA Number:
- NSA-33-015185
- OSTI ID:
- 4101351
- Journal Information:
- J. Nucl. Mater., v. 57, no. 2, pp. 212-220, Other Information: Orig. Receipt Date: 30-JUN-76; Bib. Info. Source: NL (Netherlands (sent to DOE from))
- Country of Publication:
- Netherlands
- Language:
- English
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Related Subjects
N50130* -Metals
Ceramics
& Other Materials-Ceramics & Cermets-Properties
Structure & Phase Studies
360204* -Materials-Ceramics
Cermets & Refractories- Physical Properties
*OXYGEN- DIFFUSION
*PLUTONIUM DIOXIDE- CHEMICAL COMPOSITION
*URANIUM DIOXIDE- CHEMICAL COMPOSITION
ELECTRON BEAMS
ELECTRON MICROPROBE ANALYSIS
FUEL ELEMENTS
QUANTITY RATIO
Ceramics
& Other Materials-Ceramics & Cermets-Properties
Structure & Phase Studies
360204* -Materials-Ceramics
Cermets & Refractories- Physical Properties
*OXYGEN- DIFFUSION
*PLUTONIUM DIOXIDE- CHEMICAL COMPOSITION
*URANIUM DIOXIDE- CHEMICAL COMPOSITION
ELECTRON BEAMS
ELECTRON MICROPROBE ANALYSIS
FUEL ELEMENTS
QUANTITY RATIO