X-ray diffraction andalyses confirmed the reaction between the U/sub 3/O/sub 8/ and the aluminum matrix. Small volume increases were found, however, and these were attributed to the aluminum reduction of U/sub 3/O/sub 8/, which is accompanied by measurable volume increases. Gross swelling was not observed for the aluminum- 39 wt% U/sub 3/O/sub 8/ dispersion specimens for burnup and annealing temperature levels ranging up to 1.0 x 10/sup 20/ fissions per cc and 550 deg C, respectively. Each specimen was partially clad with aluminum. Irradiated specimens of 39 wt% U/sub 3/O/sub 8/ dispersed in aluminum and of aluminum-17.3 wt% uranium alloy were andnealed.
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