Preparation and Characterization of Large Grain UO2 for Accident Tolerant Fuel

被引：10

作者：

Zhong, Yi ^{[1
]}

Gao, Rui ^{[1
]}

Li, Bingqing ^{[1
]}

Yang, Zhenliang ^{[1
]}

Huang, Qiqi ^{[1
]}

Wang, Zhiyi ^{[1
]}

Duan, Limei ^{[1
]}

Liu, Xuxu ^{[1
]}

Chu, Mingfu ^{[1
]}

Zhang, Pengcheng ^{[1
]}

Bai, Bin ^{[1
]}

Wang, Yun ^{[1
]}

Cheng, Liang ^{[1
]}

Yan, Biaojie ^{[1
]}

Liu, Tong ^{[2
]}

Li, Rui ^{[2
]}

机构：

[1] China Acad Engn Phys, Inst Mat, Jiangyou, Peoples R China

[2] China Nucl Power Technol Res Inst, Shenzhen, Peoples R China

来源：

FRONTIERS IN MATERIALS | 2021年 / 8卷

基金：

中国国家自然科学基金;

关键词：

large grain UO2; accident tolerant fuel; additive; atmosphere sintering; preparation process parameters;

D O I：

10.3389/fmats.2021.651074

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Large grain UO2 is considered as an accident tolerant fuel with great application potential due to its competitive advantage of good fission gas retention. In this paper, the influence of preparation parameters such as sintering atmosphere, mixing process, powder pretreatment and grain growth additives on the grain size of UO2 is systematically studied. The result shows that the factors mentioned above have different effects on the grain size of UO2. The grain growth of UO2 pellet sintered in oxidizing atmosphere is better than those in reducing atmosphere. The wet mixing process has a significant advantage over the dry mixing process. In addition, the powder pretreatment has little effect on grain growth while the influence of additives plays the main role. Large grain UO2 pellets with uniform grain size up to 150 mu m are successfully prepared. Finally, the thermo-physical properties of the pellets are investigated.

引用

页数：12

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