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The assessment of postulated siting source terms is crucial for determining the boundary of the exclusion area for nuclear power plants, and it is a key focus during the site selection, and for the public dose consequences at the exclusion area boundary, the national standard puts forward the requirement of “any 2 h after the occurrence of the accident” for the release period of source terms. Different nuclear power plant designs vary in their considerations of nuclide release characteristics, radionuclide removal mechanisms within the containment, and containment leakage rates, etc. Focusing on the advanced nuclear power plant design, and taking DBA LOCA, for which all fuel assemblies in the core are assumed to be affected, as the postulated siting accident. Sorting out the factors affecting the environmental releases from the postulated siting accident, including core inventory, core inventory release fractions and iodine chemical form, containment natural deposition removal capability, containment spray removal capacity, and containment leakage rate. We propose a calculation method for the maximum 2 h source terms following an accident. Compared with the traditional PWR postulated siting accident source terms calculation, this method can accurately and quickly screen the source terms period with the most serious radioactive consequences, so as to quickly evaluate the site adaptability, and timely feedback to the advanced nuclear power plant design or optimization improvement. Based on the dose control requirements specified in the national standards, and considering the meteorological conditions at typical sites, we assess the maximum 2 h environmental release source terms and radiological consequences of postulated siting accidents, and their impact on the boundary of the exclusion area. This paper provides valuable references for analyzing postulated siting accident source terms for advanced nuclear power plant siting, and the relevant typical sites meteorological conditions can also provide a certain reference for its subsequent promotion and deployment.

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Study on Postulated Siting Accident Source Terms and Dose Consequence Assessment in the Advanced Nuclear Power Plants Design

  • 会议论文

  • 发表日期：

    2026年

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  • Liu Ya,
  • Wang Mengxi,
  • Zhang Jiemin,
  • Gao Jiaxuan,
  • Wu Nan,
  • Xue Na,
  • Qiu Lin

摘要

The assessment of postulated siting source terms is crucial for determining the boundary of the exclusion area for nuclear power plants, and it is a key focus during the site selection, and for the public dose consequences at the exclusion area boundary, the national standard puts forward the requirement of “any 2 h after the occurrence of the accident” for the release period of source terms. Different nuclear power plant designs vary in their considerations of nuclide release characteristics, radionuclide removal mechanisms within the containment, and containment leakage rates, etc. Focusing on the advanced nuclear power plant design, and taking DBA LOCA, for which all fuel assemblies in the core are assumed to be affected, as the postulated siting accident. Sorting out the factors affecting the environmental releases from the postulated siting accident, including core inventory, core inventory release fractions and iodine chemical form, containment natural deposition removal capability, containment spray removal capacity, and containment leakage rate. We propose a calculation method for the maximum 2 h source terms following an accident. Compared with the traditional PWR postulated siting accident source terms calculation, this method can accurately and quickly screen the source terms period with the most serious radioactive consequences, so as to quickly evaluate the site adaptability, and timely feedback to the advanced nuclear power plant design or optimization improvement. Based on the dose control requirements specified in the national standards, and considering the meteorological conditions at typical sites, we assess the maximum 2 h environmental release source terms and radiological consequences of postulated siting accidents, and their impact on the boundary of the exclusion area. This paper provides valuable references for analyzing postulated siting accident source terms for advanced nuclear power plant siting, and the relevant typical sites meteorological conditions can also provide a certain reference for its subsequent promotion and deployment.