Effects of recrystallization on fission gas behavior in U3Si2 fuel at LWR temperature: A combination of phase-field method and rate theory

IF 1.9 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY Nuclear Engineering and Design Pub Date : 2025-02-22 DOI:10.1016/j.nucengdes.2025.113905

Zhenhong Ge , Xuxi Liu , Yanbo Jiang , Wenbo Liu , Di Yun

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Abstract

The not well-known fission gas behavior of U₃Si₂ under light water reactor (LWR) conditions is a key limitation for its application as accident tolerant fuel (ATF) in commercial LWRs. In this paper, we developed a rate theory calculation model based on the kinetic rate theory framework originally developed in the GRASS-SST code, modified by the phase-field method, to investigate the influence of grain size on fission gas behavior in U₃Si₂ fuel under LWR conditions. The phase=field model examines microstructural development, specifically, evolution in grain size, in U₃Si₂ fuel. This model is then incorporated into the rate theory framework to analyze fission gas release and the retained fission gas bubble areal fraction during irradiation. The integration of these mesoscale models enhances our understanding of the impact of grain size evolution on fission gas behavior. The simulations of fission gas release show good agreement with post-irradiation examination (PIE) data, providing validation to the model and insights into the varying retained fission gas behavior observed in different regions of irradiated fuel pellet.

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来源期刊

Nuclear Engineering and Design 工程技术-核科学技术

CiteScore

3.40

自引率

11.80%

发文量

377

审稿时长

5 months

期刊介绍： Nuclear Engineering and Design covers the wide range of disciplines involved in the engineering, design, safety and construction of nuclear fission reactors. The Editors welcome papers both on applied and innovative aspects and developments in nuclear science and technology. Fundamentals of Reactor Design include: • Thermal-Hydraulics and Core Physics • Safety Analysis, Risk Assessment (PSA) • Structural and Mechanical Engineering • Materials Science • Fuel Behavior and Design • Structural Plant Design • Engineering of Reactor Components • Experiments Aspects beyond fundamentals of Reactor Design covered: • Accident Mitigation Measures • Reactor Control Systems • Licensing Issues • Safeguard Engineering • Economy of Plants • Reprocessing / Waste Disposal • Applications of Nuclear Energy • Maintenance • Decommissioning Papers on new reactor ideas and developments (Generation IV reactors) such as inherently safe modular HTRs, High Performance LWRs/HWRs and LMFBs/GFR will be considered; Actinide Burners, Accelerator Driven Systems, Energy Amplifiers and other special designs of power and research reactors and their applications are also encouraged.