Thermodynamic analysis of uranium–gadolinium fuel stability at high temperatures

Using the most accurate measurements of the liquidus temperature in the UO 2 –Gd 2 O 3 system up to 30 mol.% of Gd 2 O 3 , thermodynamic models of the melt and cubic solution GdO 1.5 in UO 2 are constructed. The equilibrium phase diagram of the system UO 2 –GdO 1.5 in the interval 1900–3200 K is cal...

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Bibliographic Details
Published in:Atomic energy (New York, N.Y.) N.Y.), 2011-08, Vol.110 (4), p.221-229
Main Authors: Popov, S. G., Proselkov, V. N., Lysenko, V. A.
Format: Article
Language:English
Subjects:
Analysis
Energy
Equilibrium
Gadolinium
Hadrons
Heavy Ions
High temperature
Melting
Nuclear Chemistry
Nuclear Energy
Nuclear fuels
Nuclear Physics
Physics
Physics and Astronomy
Rare earth metals
Solid solutions
Studies
Thermodynamics
Toy industry
Uranium
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Summary:Using the most accurate measurements of the liquidus temperature in the UO 2 –Gd 2 O 3 system up to 30 mol.% of Gd 2 O 3 , thermodynamic models of the melt and cubic solution GdO 1.5 in UO 2 are constructed. The equilibrium phase diagram of the system UO 2 –GdO 1.5 in the interval 1900–3200 K is calculated in the entire composition range and the metastable diagram is calculated assuming that no cubic solid solutions are formed. The upper and lower boundaries of the melting onset temperature (solidus) of uraniumgadolinium fuel are presented. The phase composition of the pellets made from such fuel and, ultimately, the technology determine the melting onset temperature uniquely.
ISSN:1063-4258
1573-8205
DOI:10.1007/s10512-011-9415-3