Preparation method of monocrystal uranium dioxide nuclear fuel pellets

US10689776B2 · kind B2 · utility

Assignees

• Institute of Materials, China Academy of Engineering Physics · CN
• China Nuclear Power Technology Research Institute Co. Ltd. · CN

Inventors

• Zhenliang Yang · Jiangyou, CN
• Bingqing Li · Jiangyou, CN
• Rui Gao · Beijing, CN
• Pengcheng Zhang · Xi'an, CN
• Jianping Jia · Beijing, CN
• Hao Tang · Thuwal, SA
• Limei Duan · Jiangyou, CN
• Xuxu Liu · Jiangyou, CN
• Yi Zhong · Jiangyou, CN
• Qiqi Huang · Jiangyou, CN
• Zhiyi Wang · Changzhou City, CN
• Tong Liu · Beijing, CN
• Hailong Wu · Beijing, CN
• Siyu GAO · Nanhu, CN
• Maozhou Sun · Nanhu, CN

Key dates

• Filing date: Mar 17, 2018
• Grant date: Jun 23, 2020
• Expiry date: Oct 29, 2038

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E30/30
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The application discloses a preparation method of monocrystal uranium dioxide nuclear fuel pellets, comprising: granulating and pelleting UO2 powder to obtain UO2 pellets; then coating surfaces of the UO2 pellets with monocrystal growth additive micro powder to form core-shell structure particles; and activated-sintering the core-shell structure particles at high temperature, liquefying the monocrystal growth additive on the surface of the core-shell structure particle at high temperature and then diffusing into UO2 pellets, dissolving the UO3 in the liquid monocrystal growth additive, and recrystallizing the UO2 to form the monocrystal UO2 nuclear fuel pellets.