Abstract
The effect of hydrostatic pressures up to 1000 bar on the behavior of pre-formed bubbles in irradiated uranium has been studied. High pressure, 900 °C anneals cause the fission gas swelling, induced in uranium by 600 °C vacuum anneals, to be reversed. Subsequent high temperature (900–1080 °C) vacuum tests produce the same swelling as samples vacuum annealed to identical temperatures, but without benefit of previous pressure annealing. Reheating high temperature-pressure annealed samples to 600 °C produces no further swelling due to the lack of driving force for recrystallisation. Pressure annealing causes a reduction in the total surface area and total number of observable bubbles as well as a lowering of the vacancy/gas atom ratio.
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