Study On Radiation Protection Design Method Of Nuclear Power Plant After Accident

The purpose of radiation protection design in nuclear power plant accident conditions is to limit the risk of radioactive substances released by nuclear power plants to the public and to limit the risk of such releases and direct exposure to plant staff at acceptable levels.The design problem is a hot issue in the field of related research.In particular,after the Fukushima accident,the state security department has intensified the review of the staff protection and environmental impact of the newly constructed and under construction nuclear power plant after the accident,and explicitly requested relevant research and research on post-accident radiation protection.China’s radiation protection in the accident after the relatively late start,technical theory is not yet mature,so the need for post-accident radiation protection related analysis and research work.According to the seriousness of the design accident,the typical LOCA accident is used as the design basis.According to the core stock and the release share and release rate of the core after the accident,the leakage rate and the removal coefficient of the shell,the airborne radioactive sources of different areas of the plant after the accident are calculated.A typical nuclear plant in conjunction with the structural characteristics of the plant,consider shielding the irradiation Different plant,leakage radiation beam penetrating member,the combined effect of the sky scattering source terms,the calculated radiation dose and radiation partitions each plant after the accident.At the same time,according to the post-accident operation procedure,the intervention route of the post-accident personnel is planned and calculated to ensure that the irradiation dose of the personnel meets the requirements of the regulations.Finally,the design method of radiation protection after the accident of nuclear power plant is established,and a complete design evaluation method system for radiation shielding design after nuclear power plant accident is formed.This method can be used to evaluate the radiation protection design of nuclear power plant after the accident guidance and provide guidance for the design of nuclear power plant accident radiation protection.