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During a Loss of Coolant Accident (LOCA), the high-temperature burst of the cladding can compromise the first barrier of radiation containment, posing significant safety risks. Chromium (Cr) coating technology is considered as a promising solution to enhance the accident tolerance of cladding by extending burst time. In this study, we further developed the fuel performance analysis code CAMPUS, based on the COMSOL platform, incorporating models for high-temperature creep, oxidation, and crystallographic phase transformation. The ballooning and burst behavior of Zr-4 cladding tubes, both with and without Cr coatings, were analyzed and validated under LOCA conditions using various burst criteria. Experimental validation cases were selected from the Severe Accident Test Station (SATS) at Oak Ridge National Laboratory (ORNL) and the IFA-650 series tests conducted at the Halden Reactor. Key metrics such as burst time, internal gas pressure, burst temperature, and hoop strain were compared with experimental data. The results demonstrated that the enhanced CAMPUS code accurately predicts cladding burst behavior under LOCA conditions. Additionally, the application of Cr coatings was shown to reduce hoop strain rate in the cladding, effectively delaying burst failure and enhancing the safety margin.

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Multiphysics Analysis of the Burst Behavior of Chromium-Coated Zr-4 Cladding Under LOCA Condition

  • 会议论文

  • 发表日期：

    2026年

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  • Zefeng Zhuang,
  • Rong Liu

摘要

During a Loss of Coolant Accident (LOCA), the high-temperature burst of the cladding can compromise the first barrier of radiation containment, posing significant safety risks. Chromium (Cr) coating technology is considered as a promising solution to enhance the accident tolerance of cladding by extending burst time. In this study, we further developed the fuel performance analysis code CAMPUS, based on the COMSOL platform, incorporating models for high-temperature creep, oxidation, and crystallographic phase transformation. The ballooning and burst behavior of Zr-4 cladding tubes, both with and without Cr coatings, were analyzed and validated under LOCA conditions using various burst criteria. Experimental validation cases were selected from the Severe Accident Test Station (SATS) at Oak Ridge National Laboratory (ORNL) and the IFA-650 series tests conducted at the Halden Reactor. Key metrics such as burst time, internal gas pressure, burst temperature, and hoop strain were compared with experimental data. The results demonstrated that the enhanced CAMPUS code accurately predicts cladding burst behavior under LOCA conditions. Additionally, the application of Cr coatings was shown to reduce hoop strain rate in the cladding, effectively delaying burst failure and enhancing the safety margin.