In-situ, time resolved monitoring of uranium in BFS:OPC grout. Part 1: Corrosion in water vapour

Uranium encapsulated in grout was exposed to water vapour for extended periods of time. Through synchrotron x-ray powder diffraction and tomography measurements, uranium dioxide was determined the dominant corrosion product over a 50-week time period. The oxide growth rate initiated rapidly, with ra...

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Detalles Bibliográficos
Autores principales: Stitt, C. A., Paraskevoulakos, C., Banos, A., Harker, N. J., Hallam, K. R., Davenport, A., Street, S., Scott, T. B.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5554164/
https://www.ncbi.nlm.nih.gov/pubmed/28801638
http://dx.doi.org/10.1038/s41598-017-08601-x
Descripción
Sumario:Uranium encapsulated in grout was exposed to water vapour for extended periods of time. Through synchrotron x-ray powder diffraction and tomography measurements, uranium dioxide was determined the dominant corrosion product over a 50-week time period. The oxide growth rate initiated rapidly, with rates comparable to the U + H(2)O reaction. Over time, the reaction rate decreased and eventually plateaued to a rate similar to the U + H(2)O + O(2) reaction. This behaviour was not attributed to oxygen ingress, but instead the decreasing permeability of the grout, limiting oxidising species access to the metal surface.

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