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Sub-cooled nucleate boiling (SNB) on fuel cladding surface is the direct cause of corrosion products deposition. In order to simulate the power distribution in the core of nuclear power plant, the fuel crud deposition tests of domestic zirconium alloy fuel cladding in different SNB environments were carried out in this paper, and the SNB sensitivity results were obtained. The more severe the SNB, the more serious the fuel crud deposition. With the aggravation of SNB, the crud coverage on the fuel cladding surface was more complete, the crud thickness increased, the Ni/Fe decreased, and the boron precipitation mass within the crud increased. The results show that the higher the power of assembly, the more serious the crud deposition on the cladding surface, and the risks of CIPS and CILC may increase.

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Effect of SNB on Crud Deposition and Boron Precipitation on Fuel Cladding Surface

  • 会议论文

  • 发表日期：

    2026年

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  • Desheng Jin,
  • Jiapeng Liao,
  • Wei Zhang,
  • Haotian Wang,
  • Yulong Mao

摘要

Sub-cooled nucleate boiling (SNB) on fuel cladding surface is the direct cause of corrosion products deposition. In order to simulate the power distribution in the core of nuclear power plant, the fuel crud deposition tests of domestic zirconium alloy fuel cladding in different SNB environments were carried out in this paper, and the SNB sensitivity results were obtained. The more severe the SNB, the more serious the fuel crud deposition. With the aggravation of SNB, the crud coverage on the fuel cladding surface was more complete, the crud thickness increased, the Ni/Fe decreased, and the boron precipitation mass within the crud increased. The results show that the higher the power of assembly, the more serious the crud deposition on the cladding surface, and the risks of CIPS and CILC may increase.