基于事故容错燃料的高燃耗组件研究进展

doi:10.11896/cldb.23090025

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Abstract In the pursuit of the dual objectives of heightened economic efficiency and enhanced safety, the trend of achieving high burnup levels, exceeding 62 GWd/MTU, has become a prominent focal point in nuclear fuel development. However, it is imperative to recognize that increasing burnup levels inevitably introduce challenges, leading to the degradation and potential failure of both fuel pellets and cladding materials, thus giving rise to safety concerns. This paper initiates with a comprehensive examination and delineation of the challenges confronted by conventional UO₂ fuel pellet and Zr alloy cladding when operating under high burnup conditions. For instance, the formation and rapid propagation of high burnup structures at the periphery of pellets, increasing proportion of fission gas release, heightened internal pressures within fuel rods, enhancement of corrosion associated with hydrogen pickup of claddings. In addition, the fragmentation, relocation, and dispersal of fuel pellets during the loss of coolant accident scenarios. This paper elucidates the critical strategies employed to address the above challenges effectively. Subsequently, the article consolidates and summarizes the recent developments and accomplishments within the nuclear industry pertaining to accident tolerant fuel. It places particular emphasis on the critical in-service performance of Cr-coated Zr alloy claddings and large-grained UO₂ fuel pellet, including fission gas release, pellet and cladding mechanical interactions, corrosion of cladding in aqueous environments, and high-temperature steam oxidation and quenching behavior. Simultaneously, the paper conducts a comparative analysis between the Cr-coated Zr alloy cladding and large-grained UO₂ fuel pellets ATF project with the traditional nuclear fuel system. Particular attention is given to operational advantages, particularly in the context of high burnup conditions. The research findings strongly suggest the recent ATF projects hold significant promise for application in high burnup projects. This review aims to deepen nuclear industry stakeholders' understanding of high burnup initiatives while offering insightful guidance for integrating domestically developed ATF materials into high burnup applications, thus contributing to the advancement of nuclear power safety and economic viability.

Key words： high burnup fuel assembly accident tolerant fuel Cr-coated Zr alloy claddings large-grained UO₂ pellets

Published: 25 November 2024 Online: 2024-11-22

CLC number:

TL352.1

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	Articles by authors
	FU Hao
	PENG Zhenxun
	LIAO Yehong
	XUE Jiaxiang
	SHEN Zhao
	ZHOU Zhangjian

Cite this article:

FU Hao,PENG Zhenxun,LIAO Yehong, et al. A Complete Review on the Accident Tolerant Fuel for the High Burnup Assembly[J]. Materials Reports, 2024, 38(22): 23090025-12.

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http://www.mater-rep.com/EN/10.11896/cldb.23090025 OR http://www.mater-rep.com/EN/Y2024/V38/I22/23090025

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