In the aspect of long-distance transport and deposition of airborne nuclear pollutants, Eulerian-Lagrangian method can combine the theoretical advantages of the Lagrange method and Euler method, but and there are few studies in China.

This study aims to verify the effectiveness of this method for long distance transport and deposition of airborne nuclear pollutants by simulating a nuclear leakage accident of one nuclear power plant in China.

Assuming that a nuclear power plant in the eastern coastal area of China has a leakage similar to the Fukushima nuclear accident, the numerical simulation of the long-distance transport process of nuclear pollutants in the atmosphere was carried out by using the Euler-Lagrangian method of MATCH (Multi-scale Atmospheric Transport and Chemistry) module in JRODOS (Java Real-time On-line Decision Support) system. The results of surface deposition and the distribution of dose rate field were combined with the actual weather map to verify the trend.

The simulation and verification results show that the wet deposition plays an important role in the removal of nuclear pollutants, and the Eulerian-Lagrangian method can give the main characteristics of long-distance transport and deposition of nuclear pollutants in the atmosphere.

The simulation results are in good agreement with the actual weather trend, and this method can provide auxiliary reference for China's nuclear accident consequence assessment and emergency decision-making.