Uranium concentrate —process raw material in a solid state— is dissolved in nitric acid and hydrogen peroxide. Once the hydrogen peroxide matures, a Uranyl Nitrate Pure Solution (UNPS) with lower purity is obtained (UNH, uranyl nitrate hydrate).
The solution is purified by means of filtering, extraction and reextraction and is converted into a high purity uranyl nitrate solution.
By means of vaporizing the initial volume, a concentrate (400 g uranium/litre) of high purity uranyl nitrate.
A reaction of the uranyl nytrate reaction is produced by ammonia, carbon dioxide and water whereby an ammonium uranyl carbonate precipitate, AUC, is obtained. It is filtered and washed and then transported to the next conversion stage.
The AUC neumatically transported is converted to UO2 in the fluidized oven or furnace.
Finally, in an homogeneizator, different loads of dust, produced on the furnace, are mixed to make up the uranium dioxide lot.
The material obtained is sent to the fuel assemblies fabrication plant where it pressed. From the material, pellets are obtained, which, upon sintered, acquire the necessary density to be used as nuclear fuel.