Study on the Atmospheric Diffusion of Airborne Radionuclide under LOCA of Offshore Floating Nuclear Power Plants Based on CALPUFF

Studying the migration and diffusion of radionuclides plays an important role in emergency decision making accident mitigation floating nuclear power plants. Based on CALPUFF model, this paper simulates spatial distribution concentration airborne 131I under conditions sailing supply LOCA (Loss-of-Coolant Accident) plant, influence four meteorological parameters, namely wind speed, cloudiness, temperature air pressure, was analyzed using sensitivity analysis. The results show that direction affects 131I, decreases with increase distance; same conditions, diffuses farther affected area is larger condition. Wind speed dominant factor affecting radionuclides, followed by cloud amount parameter, pressure parameter. research can provide theoretical support for responses to accidents offshore