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| Book/Report | FZJ-2016-03662 |
; ;
1978
Kernforschungsanlage Jülich, Verlag
Jülich
Please use a persistent id in citations: http://hdl.handle.net/2128/11737
Report No.: GA-A14759; Juel-1502; UC-77
Abstract: The available data on low-enriched (LEU) fuel particles were reviewed under the United States-Federal Republic of Germany Agreement. The most influential factors controlling the irradiation performance of LEU fuel particles were found to be plutonium transport, fission product transport, fuel particle mechanical performance, and fuel particle chemical performance. PLUTONIUM TRANSPORT Pu-238, which is derived from U-235, represents the dominant radiological hazard. Since the U-235 inventory in an LEU core is approximately the same as that in an HEU core, plutonium transport is therefore of importance to both LEU and HEU systems. The diffusion coefficient of plutonium in high-temperature-isotropic pyrocarbon is about an order of magnitude higher than that of uranium and two orders of magnitude higher than that of thorium. A BISO coating is not a good barrier for plutonium release, but a TRISO coating retains plutonium. Graphite appears to be an effective trap for plutonium. Thé phase compositions and plutonium vapor pressures over irradiated uranium oxycarbide kernels have been deduced from thermodynamic data. It is concluded that plutonium is present in solid solution in the corresponding uranium-containing phases, and that the vapor pressure is lower than that of plutonium carbide. Experimental confirmation of these conclusions is desirable.
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