The regional scale atmospheric dispersion analysis and environmental radiation impacts assessment for the hypothetical accident in Haiyang nuclear power plant

摘要

The Haiyang Nuclear Power Plant (HYNPP) was put into commercial operation at the end of 2018, and the nuclear accident has caused great concern about the environment. In this paper, the improved Weather Research and Forecasting Chemistry (WRF-Chem) model is used to study the atmospheric migration process of radionuclides released by HYNPP in a hypothetical accident to assess the potential risks to the public. Firstly, the ground deposition of Cs-137 in the Fukushima nuclear accident during the Fukushima nuclear accident was simulated to verify the model. Then, the atmospheric dispersion, groud deposition process and environmental impact of the radionuclides I-131 and Cs-137 in February and August were simulated. The results show that the northwest wind affected accidents in February mainly caused pollution in the southeastern part of HYNPP, including South Korea, western Japan, and Taiwan. However, due to the impact of regional meteorological changes, the surface subsidence and environmental radiation doses received by the Shandong Peninsula are the most serious; the impact of east wind in August will mainly affect the west area of HYNPP, but it also has an impact on Northeast China, the Korean Peninsula region and Kyushu, Japan. The research results are aimed at supporting emergency decision-making of nuclear accidents and improving nuclear emergency response capabilities in surrounding areas.