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As an advanced reactor type of nuclear power plants, the High Temperature Gas-cooled Reactor-Pebblebed Modules (HTR-PM) has attracted more attention for its advantages in enhanced safety, high-efficiency power generation, and system simplification. The Huaneng Shandong Shidao Bay Nuclear Power Station represents the world’s first demonstration project for commercializing the fourth-generation nuclear power technology. The HTR-PM uses helium as a coolant, and the fuel is in the form of coated particles, characterized by a negative reactivity temperature coefficient and a high coolant outlet temperature. The gamma nuclides in the primary circuit of the HTR-PM encompass nuclear fuel fission products and neutron activation products, etc. This study conducted an in-depth analysis of the radiation source terms of gamma nuclides in the primary circuit of the HTR-PM. During the reactor startup and at different power levels, the gamma nuclides were sampled using an inert gas sampling device and then accurately measured with a high—purity germanium gamma spectrometer. Through these procedures, the types, activities, and sources of the key gamma nuclides in the primary-circuit helium were precisely determined, and the source-term analysis data for the HTR-PM project were successfully obtained. Notably, the source term of Ar-41 was discovered for the first time, which effectively filled a significant gap in the design. Moreover, the study explored the generation mechanisms and influencing factors of gamma radionuclides. Based on the findings of this research, a system-optimized control strategy for this project was proposed. This strategy provided robust theoretical support and practical guidance for the commissioning, overhaul, and operation of subsequent projects.

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Analysis and Discussion on Gamma Nuclide Radiation in Primary Circuit and Optimal Control of HTR-PM

  • 会议论文

  • 发表日期：

    2026年

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  • Wenting Jia,
  • Qian Ma,
  • Xi Chen,
  • Shiwei Guo,
  • Yulin Zhang,
  • Ermo Wang,
  • Peng Su,
  • Chuang Yuan

摘要

As an advanced reactor type of nuclear power plants, the High Temperature Gas-cooled Reactor-Pebblebed Modules (HTR-PM) has attracted more attention for its advantages in enhanced safety, high-efficiency power generation, and system simplification. The Huaneng Shandong Shidao Bay Nuclear Power Station represents the world’s first demonstration project for commercializing the fourth-generation nuclear power technology. The HTR-PM uses helium as a coolant, and the fuel is in the form of coated particles, characterized by a negative reactivity temperature coefficient and a high coolant outlet temperature. The gamma nuclides in the primary circuit of the HTR-PM encompass nuclear fuel fission products and neutron activation products, etc. This study conducted an in-depth analysis of the radiation source terms of gamma nuclides in the primary circuit of the HTR-PM. During the reactor startup and at different power levels, the gamma nuclides were sampled using an inert gas sampling device and then accurately measured with a high—purity germanium gamma spectrometer. Through these procedures, the types, activities, and sources of the key gamma nuclides in the primary-circuit helium were precisely determined, and the source-term analysis data for the HTR-PM project were successfully obtained. Notably, the source term of Ar-41 was discovered for the first time, which effectively filled a significant gap in the design. Moreover, the study explored the generation mechanisms and influencing factors of gamma radionuclides. Based on the findings of this research, a system-optimized control strategy for this project was proposed. This strategy provided robust theoretical support and practical guidance for the commissioning, overhaul, and operation of subsequent projects.