Scientific journal
Scientific Review. Technical science
ISSN 2500-0799
ПИ №ФС77-57440

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INFLUENCE OF STRUCTURE AND COMPOSITION ON STRAIN RESISTANT OXID NUCLEAR FUEL

Bozhko Y.V. 1 Malygin V.B. 1
1 State Institution Federal Autonomous Educational Establishment for Higher Vocational Education National Research Nuclear University MEPhI
This paper is presented the theoretical and experimental results for developing and produced low-strain resistant oxide nuclear fuel. This problem can be solved via the alloying of uranium dioxide fuel. The subsequent comparative analysis proved that the most promising approach to the resolution of the problem relevant to lowering down the strain resistance is to alloy uranium dioxide with mullite (3Al2O32SiO2) which forms intergranular precipitates of low shear resistance strength phases and niobium oxide as a solid solution. Under laboratory and irradiation conditions at different temperatures the influence was studied that is produced by various additives, namely, oxides of iron, niobium, silicon, aluminum and their combinations, on creep. The investigations have demonstrated that the strain resistance of modified uranium dioxide is much lower compared that of the fuel having the standard composition.