期刊
RUSSIAN JOURNAL OF APPLIED CHEMISTRY
卷 94, 期 3, 页码 317-322出版社
PLEIADES PUBLISHING INC
DOI: 10.1134/S1070427221030071
关键词
microwave radiation; denitration; uranyl nitrate solutions; actinides; uranium dioxide; pellet sintering; nuclear fuel
资金
- Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences [0137-2019-0022]
The study investigated the fabrication of ceramic UO2 fuel pellets using microwave radiation. The UO2 powder obtained met the requirements for nuclear fuel fabrication, and the sintered samples also met the requirements for use in thermal reactors.
Fabrication of ceramic UO2 fuel pellets using microwave radiation was studied. The UO2 powder was prepared by microwave denitration of a nitric acid solution containing 400 g L-1 uranium. The tapped density (2.39 g cm(-3)) and total specific surface area (2.70 m(2) g(-1)) of the powder obtained met the requirements to the powder for nuclear fuel fabrication (TU (Technical Specification) 95 414-2005: Uranium Dioxide Powder of Ceramic Grade with the Uranium-235 Isotope Content Lower than 5.0%). Pellets were pressed from the UO2 powder under varied conditions including pressure, its application mode, pressing time, and presence of binder. The pressed pellets were sintered at 1650 degrees C for 2 h in an Ar + 10 vol % H-2 atmosphere under the action of microwave radiation. The density of the samples obtained, 10.40 +/- 0.02 g cm(-3), meets the requirements to ceramic fuel pellets used in thermal reactors.
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