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With the operation of nuclear power plants (NPPs), more and more activated corrosion deposits accumulate on the inner walls of process equipment and pipelines in the primary circuit. According to historical operating experience, over 90% of the collective dose is caused by the radioactive deposits (Rocher and Berger in Impact of main radiological pollutants on contamination risks (ALARA) optimization of physico chemical environment and retention technics during operation and shutdown, 2004 [1]). For systems and equipment that have already been contaminated, the only measure to reduce radioactive levels is decontamination. Different from general physical decontamination technologies, chemical decontamination can effectively and conveniently decontaminate the internal walls of various equipment and pipelines of various shapes and structures online. Due to the lack of relevant engineering experience in China, this article has compared the design configuration of radioactive decontamination systems for different types of pressurized water reactor (PWR) nuclear power units such as CPR1000, AP1000, EPR, and HPR1000, and investigated different in-service chemical decontamination system design schemes of multiple companies including Westinghouse, AREVA, etc. (Westinghouse Electric Company LLC homepage in https://westinghousenuclear.com/data-sheet-library/chemical-decontamination-solutions/ , 2016 [2]). Through comparative analysis, a summary on the key points in designing of in-service online chemical decontamination system has been made, hoping to guide the implementation of chemical decontamination projects for Chinese PWRs in the future.

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Analysis on the Current Status of Radioactive Chemical Decontamination System Design of Pressurized Water Reactor Nuclear Power Plant

  • 会议论文

  • 发表日期：

    2026年

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  • Haicheng Gu,
  • Weilun Liang,
  • Zhennan Zhang,
  • Guocai Xi,
  • Zhili Zou,
  • Ming Huo

摘要

With the operation of nuclear power plants (NPPs), more and more activated corrosion deposits accumulate on the inner walls of process equipment and pipelines in the primary circuit. According to historical operating experience, over 90% of the collective dose is caused by the radioactive deposits (Rocher and Berger in Impact of main radiological pollutants on contamination risks (ALARA) optimization of physico chemical environment and retention technics during operation and shutdown, 2004 [1]). For systems and equipment that have already been contaminated, the only measure to reduce radioactive levels is decontamination. Different from general physical decontamination technologies, chemical decontamination can effectively and conveniently decontaminate the internal walls of various equipment and pipelines of various shapes and structures online. Due to the lack of relevant engineering experience in China, this article has compared the design configuration of radioactive decontamination systems for different types of pressurized water reactor (PWR) nuclear power units such as CPR1000, AP1000, EPR, and HPR1000, and investigated different in-service chemical decontamination system design schemes of multiple companies including Westinghouse, AREVA, etc. (Westinghouse Electric Company LLC homepage in https://westinghousenuclear.com/data-sheet-library/chemical-decontamination-solutions/ , 2016 [2]). Through comparative analysis, a summary on the key points in designing of in-service online chemical decontamination system has been made, hoping to guide the implementation of chemical decontamination projects for Chinese PWRs in the future.