7/23/2023 0 Comments Fission uranium bond yield![]() ![]() Experiments on the more » storage of fuel pins at 350 deg C in Ar atmospheres showed that the presence of 5% N lowered product yields only slightly during subsequent melt-refining operations. The effect of N concentration on the nitridation rates of unirradiated U-fissium alloys in Ar-N atmospheres was determined. Data were not obtained on the behavior of fission products. A 392-g charge of U-5% fissium fuel pins irradiated to an estimated burnup of 0.4 total at.% and cooled 28 days was melt refined for three hours at 1400 deg C. ![]() The second laboratory demonstration of the melt-refining process with highly irradiated EBR- IItype fuel pins was completed. = ,Ĩ 7 < 6 : : = 8 g developed for recovering fissionable and fertile materials from shortcooled reactor fuels. Swelling of the fuel pins and the associated release of fission product gases during the heating cycle caused no difficulty in the melt refining process on this scale. Because of the small scale of the experiments and necessary exposure of the irradiated fuel to air in the cave facility, it was not possible to obtain definitive data on product yields. Fission product removals were over 99 per cent for krypton, xenon, iodine, cesium, barium, and strontium, over 95 percent for yttrium, rare earths, and tellurium, and zero for the noble metals. The behavior of fission products was consistent with the earlier results. In each experiment, approximately 0.4 kg of uranium-fissium fuel pins irradiated to burnups ranging from 0.22 to 1.75 total atom percent was melt refined for 1 or 3 hr at 1400 C in a limestabilized zirconia crucible. ![]() Five melt refining demonstration experiments were conducted with highly irradiated EBR-II prototype fuel to verify earlier data on fission product removals obtained with unirradiated and lower-activity alloys. ![]()
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