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UO2, also known as urania, is a radioactive, crystalline powder that naturally occurs in the mineral uraninite, used in nuclear fuel rods in nuclear reactors.
In advance of the operation of such a fuel fabrication plant, Iran could agree to convert its enriched UF6 inventory to UO2. Iran could also fabricate UO2 pellets for VVER fuel assemblies in advance of making assemblies and loading and irradiating the fuel in a power reactor, as the UO2 would be chemically stable after pelletization.
The now low-enriched uranium ([UF.sub.6]) undergoes one final process, converting to uranium dioxide (UO2), before the final stage of fuel fabrication.
However, Van Uffelen notes "despite promising results for the behaviour of fission products in UO2, and a better understanding of the basic phenomena, it is still too ambitious to conceive a fuel performance code based solely on fundamental computations." This is because of varying demands within the various test techniques regarding temperature, space and time-scale.
The uranium concentrate comes in the form of U3O8 and is converted in a series of processes into UO2, then into UF4, and finally into UF6.
(1991): The kinetics of dissolution of UO2 under reducing conditions and the influence of an oxidized surface layer (UO2+x): Application of a continuous flow-through reactor.
The enriched UF6 is then converted to uranium dioxide, or UO2, which is packaged in the fuel bundles used in nuclear reactors.
"This case is about a competitor trying to protect itself from competition with the best technology", Dr Messer said, "We are determined to bring the benefits of our world class centrifuge enrichment technology to our US customers."--LEU is enriched uranium hexafluoride (UF6) with a U235 assay of less than 20% that has not been converted into another chemical form, such as UO2, or fabricated into nuclear fuel assemblies, regardless of the means by which the LEU is produced (including LEU produced through the down-blending of highly enriched uranium).
Higher U and Th concentrations, pronounced hydrothermal activity, relatively higher abundances of trace and REE and presence of UO2 in zircons in Malani granites enhance the probability of the creation of primary mineralization.
Iran converted the UF4 into uranium metal (see below), and used the UO2 in various processing experiments, including isotope production and purification and conversion processes.
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