大晶粒UO<sub>2</sub>燃料芯块性能研究进展

doi:10.11896/cldb.22010197

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Abstract Large grain uranium dioxide possessed much lower irradiation swelling and amount of fission gas release, much more excellent resist ability to the pellet and cladding interaction than the traditional UO₂ pellet. Large grain UO₂ pellet is a kind of new fuel with great application potential for high burn up and long reloading reactor, which has attracted more and more attention in recent years. Lots of studies on the properties of large grain UO₂ pellet have been conducted, including microstructure, sintering properties and irradiation behavior. The research result indicates that large grain UO₂ pellet exhibited more excellent in-pile performance than traditional ones under high burn-up and long reloading cycle, thus the application of large grain UO₂ pellet can improve the safety and economy of the reactor. Irradiation tests have been conducted in European, American, Russia and other countries, and the testing environments include the boiling water reactor (BWR), pressure water reactor (PWR) and high temperature reactor (HTR). The research on the in-pile and out-pile properties of large grain UO₂ pellet offered the basics for the fabrication, in-pile performance prediction, fuel element design and commercial process. In this paper, the microstructure, out-pile thermal-mechanical properties, in-pile performance of large grain UO₂ pellets were summarized based on the research at home and abroad. The properties of large grain UO₂ pellet with different additives were also introduced. Furthermore, the performance of large grain UO₂ fuel element was analyzed and the application problem was pointed out.

Key words： large grain uranium dioxide in-pile properties mechanical properties microstructure

Published: 25 February 2022 Online: 2022-02-28

CLC number:

TL35

Fund:National Natural Science Foundation of China (12005213,U20B2013) and Young Talent Project of China National Nuclear Corporation.

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	Articles by authors
	PANG Hua
	XIN Yong
	YUE Huifang
	PENG Hang
	PU Zengping
	QIU Xi
	SUN Zhipeng
	LIU Shichao

Cite this article:

PANG Hua,XIN Yong,YUE Huifang, et al. Research Progress on the Properties of Large Grain Uranium Dioxide Fuel[J]. Materials Reports, 2022, 36(4): 22010197-8.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.22010197 OR http://www.mater-rep.com/EN/Y2022/V36/I4/22010197

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