Author : Guilherme Da Silva Cardoso
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (122 download)
Book Synopsis Determination of the Microscopic Kinetic Parameters of the Dissolution of UXPu1-XO2 in Nitric Acid - Development and Qualification of the Method on UO2 by : Guilherme Da Silva Cardoso
Download or read book Determination of the Microscopic Kinetic Parameters of the Dissolution of UXPu1-XO2 in Nitric Acid - Development and Qualification of the Method on UO2 written by Guilherme Da Silva Cardoso and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The reprocessing of spent nuclear fuel is a very important step in the nuclear fuel cycle and one of the greatest ways to ensure the sustainability of the civil nuclear industry. In France, the PUREX process is used to separate the reusable Uranium and Plutonium from the fission products and minor actinides that will then be disposed as waste. The dissolution of the spent fuel is at the head-end of this process and thus has a big impact on the following stages. The present work was done in the context of the development of a model for the dissolution step that will be used to design the dissolution reactors of the future. Some of the inputs this model will need are the kinetic constants of the dissolution reactions, which are quite complex. To achieve this, the dissolution of small grains of UO2 was studied under several experimental conditions. An algorithm was developed with the software MatLab which takes as input the images of the grains taken at regular intervals during the dissolution and as an output the dissolution rates in nm/s and mol/m2 /s. The algorithm binarises the grain images in order to have a clear distinction between grain and background, follows the area and perimeter of the oxide grains throughout the dissolution and finally calculates the wished results. The dissolution speeds at different experimental conditions will allow for the calculations of kinetic constants and activation energies which will then feed the dissolution model.
