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During Hot Functional Test (HFT) at PWR Nuclear Power Plant, concentration of Al was found to exceed standard set by TP-W-CDF-14 Water chemistry monitoring. Al in primary circuit was removed using an ion exchange resin bed and water exchange treatment. However, these treatments can not obtain satisfactory purification effect. Many oxides and silicates of Al have negative temperature coefficients of solubility. They will deposit preferentially on the fuel rods and could increase corrosion of the cladding. To develop more effective measures for Al removal, this paper investigates the forms of Al under different conditions. Limitations of adsorption capacity of ion-exchange resin for Al-containing solutions were demonstrated through experiments, and membrane technology for Al removal was also explored. The resins GR4-9Li, GR4-9OH, and GR-V10 (OH) effectively remove Al from LiOH solution, with GR4-9Li exhibiting the lowest removal efficiency and GR4-9OH showing the highest. GR-V10 (OH) resin has a lower removal effect compared to GR4-9OH resin. Reverse osmosis membranes demonstrate better Al removal efficiency than nanofiltration membranes. The maximum aluminum retention rate achieved using a specific nanofiltration membrane is 97.3%, with minimal impact on pH of solution. Nanofiltration is recommended as a method for aluminum removal during HFT.

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Study on Aluminum Removal During Hot Functional Test of Primary Circuit at PWR Nuclear Power Plant

  • 会议论文

  • 发表日期：

    2026年

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  • Zhaohui Tian,
  • Yun Sun,
  • Zefeng Yu,
  • Fuping Li,
  • Yicai Liang,
  • Lijun Song,
  • Zhipeng Wang,
  • Canshuai Liu,
  • Xiaocong Zhan,
  • Jing Cao

摘要

During Hot Functional Test (HFT) at PWR Nuclear Power Plant, concentration of Al was found to exceed standard set by TP-W-CDF-14 Water chemistry monitoring. Al in primary circuit was removed using an ion exchange resin bed and water exchange treatment. However, these treatments can not obtain satisfactory purification effect. Many oxides and silicates of Al have negative temperature coefficients of solubility. They will deposit preferentially on the fuel rods and could increase corrosion of the cladding. To develop more effective measures for Al removal, this paper investigates the forms of Al under different conditions. Limitations of adsorption capacity of ion-exchange resin for Al-containing solutions were demonstrated through experiments, and membrane technology for Al removal was also explored. The resins GR4-9Li, GR4-9OH, and GR-V10 (OH) effectively remove Al from LiOH solution, with GR4-9Li exhibiting the lowest removal efficiency and GR4-9OH showing the highest. GR-V10 (OH) resin has a lower removal effect compared to GR4-9OH resin. Reverse osmosis membranes demonstrate better Al removal efficiency than nanofiltration membranes. The maximum aluminum retention rate achieved using a specific nanofiltration membrane is 97.3%, with minimal impact on pH of solution. Nanofiltration is recommended as a method for aluminum removal during HFT.