Research on Radiation Risk of On-Site Workers Based on PSA Accident Sequence

From the perspective of total risk control, the dose and radiation risk acceptance criteria of on-site workers under accident conditions are put forward, and the corresponding assessment methods are established. Taking a typical PWR nuclear power plant as an example, the full-scope accident sequence of probabilistic safety analysis (PSA) was used for verification and assessment, and the radiation dose and the risk of radiation lethality of on-site workers after a typical PWR nuclear power plant accident were assessed. The verification results show that the total radiation lethality risk of the on-site workers after the accident is much lower than the total death risk value of the public due to natural disasters, diseases, traffic accidents and different industries; After the accident, the radiation lethality risk accounts for the highest proportion when the workers operate in the fuel building. Therefore, when the workers carry out relevant operations in the fuel building, they can formulate corresponding radiation protection measures in advance to reduce the radiation risk; Other personnel in the working group and accidental exposure personnel account for a relatively high risk of radiation lethality after the accident, airborne radioactivity can be protected by air masks and other methods to reduce its radiation risk. The corresponding analysis results can provide reference for the formulation of the post-accident treatment plan of the nuclear power plant and the radiation protection measures for the on-site workers after the accident.