Abstracts and Available Papers Presented at the
1999 International RERTR Meeting

 An Investigation on g-U Phase Stability and Thermal Compatibility
of Dispersion Fuel Meats Prepared with Atomized U-16at.%Mo,
 U-14at.%Mo-2at.%Ru and U-14at.%Mo-2at.%Os

Chang-Kyu Kim, Ki-Hwan Kim, Yoon-Sang Lee, Soo-Bong Park
Korea Atomic Energy Research Institute
 Taejon, Korea

G. L. Hofman
Argonne National Laboratory
Argonne, Illinois, USA

ABSTRACT

The g-U phase stability and the thermal compatibility of atomized U-16at.%Mo and U-14at.%Mo-2at.%X(: Ru, Os) dispersion fuel meats at an elevated temperature have been investigated.  The atomized U-14at.%Mo-2at.%Os powder appeared to have longer decomposition time than the atomized U-16at.%Mo and U-14at.%Mo-2at.%Ru powders.  The inter-diffusion of atomized U-14at.%Mo-2at.%Os particles with Al matrix were shown to form thinner and more uniform layers than the other alloy particles. The Al atoms seems to diffuse more easily along the decomposed lamella inter-phases than the cell boundaries of γphase. The addition of Os instead of Mo is expected to have a beneficial effect on increasing U-density of fuel due to better g-U phase stability and thermal compatibility.

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