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Elaboration of fundamental and technological principles for fabrication of nanoparticle-reinforced fuel pellets based on uranium dioxide for fuel elements

Разработка научных и технологических принципов получения упрочнённых наночастицами топливных таблеток на основе диоксида урана для ТВЭЛов
The technology is designed for fabricating next-generation fuel pellets based on uranium dioxide and having the modified structure via powder metallurgy methods by adding a nanodispersed alloying composite containing aluminum hydroxide or titanium dioxide. The modified structure of the resulting pellets increases the degree of fuel burn-up and, correspondingly, increases the service life of fuel elements before they are replaced. The use of aluminum hydroxide (instead of its oxides or complex compounds, which are rather difficult to synthesize in a nanodispersed state because of agglomerate formation) as an alloying agent allowed one to prevent the agglomeration of aluminum oxide particles obtained during the decomposition of aluminum oxide when the pellets had been preliminarily sintered. The resulting samples of fuel pellets with the structure modified by adding an alloying composite containing aluminum hydroxide ensures the following properties: - relative density of a uranium dioxide fuel pellet – 98.0-98.3%; - average grain size – 36-39 µm; - thermal conduction – 3.5-4.1 W/(m K); - shearing property – 5%. Scope of application: production of fuel pellets for fuel elements of civil nuclear power reactors.


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Ph.D, Doctor of Science, Professor of the Department of Powder Metallurgy and Functional Coatings
Ph.D., Associate Professor of the Department of Powder Metallurgy and Functional Coatings
Ph.D., Leading Research Scientist


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