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The near-term research and development target for accident tolerant fuel (ATF) has been focused on Cr-coated Zr alloy cladding. Extensive experiments have been conducted to investigate the high-temperature oxidation behavior of Cr-coated Zr alloy. However, models for predicting the oxidation of the Zr substrate after Cr coating degradation remain insufficient. This paper first reviews the previously developed model for Cr coating degradation. In contrast to traditional models that only consider Cr oxidation, our model incorporates the effects of ZrO2 channels and Cr2O3 reduction, thereby enabling more accurate predictions of Cr coating degradation behavior. Furthermore, the SICO (SImulation of Cladding Oxidation) code is reviewed, which was developed to predict the oxidation of uncoated Zr alloy cladding. SICO code discretizes and solves diffusion equations to obtain the thicknesses of β-Zr, α-Zr(O), and ZrO2, as well as the oxygen content distribution. It is well-suited for conditions where the Zr substrate beneath the Cr coating experiences limited oxygen flux. Based on these foundations, this paper aims to develop a model for determining the oxygen flux diffusing into the Zr substrate during Cr coating degradation and apply it within the framework of the SICO code to predict the oxidation of the Zr substrate. This paper presents preliminary attempts at model development and model validation.

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Model Development for Determining Oxygen Flux Diffusing into Zr Substrate in the Degradation Stage of Cr Coating Under High-Temperature Steam Oxidation Conditions

  • 会议论文

  • 发表日期：

    2026年

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  • Dong Wang,
  • Kai Lu,
  • Yapei Zhang,
  • G. H. Su,
  • Xi Liu

摘要

The near-term research and development target for accident tolerant fuel (ATF) has been focused on Cr-coated Zr alloy cladding. Extensive experiments have been conducted to investigate the high-temperature oxidation behavior of Cr-coated Zr alloy. However, models for predicting the oxidation of the Zr substrate after Cr coating degradation remain insufficient. This paper first reviews the previously developed model for Cr coating degradation. In contrast to traditional models that only consider Cr oxidation, our model incorporates the effects of ZrO2 channels and Cr2O3 reduction, thereby enabling more accurate predictions of Cr coating degradation behavior. Furthermore, the SICO (SImulation of Cladding Oxidation) code is reviewed, which was developed to predict the oxidation of uncoated Zr alloy cladding. SICO code discretizes and solves diffusion equations to obtain the thicknesses of β-Zr, α-Zr(O), and ZrO2, as well as the oxygen content distribution. It is well-suited for conditions where the Zr substrate beneath the Cr coating experiences limited oxygen flux. Based on these foundations, this paper aims to develop a model for determining the oxygen flux diffusing into the Zr substrate during Cr coating degradation and apply it within the framework of the SICO code to predict the oxidation of the Zr substrate. This paper presents preliminary attempts at model development and model validation.