| Nuclear power as a clean energy, there are important sense to meet the demand of china's power, optimize energy structure, promote the sustainable development. With the running of nuclear power station, there are some radioactive substances inevitably flowing into the sea. So it is necessary to simulate the transport of radioactive substances in the sea water.The wind of year 1995 and year 2001 at Daya Bay nuclear power station were analysised firstly. The correlation of monsoon in different years and the land and sea breeze were studied. It will provide technical support for further study of material transport in sea water in the condition of wind, so as to reduce the influence of the radioactive liquid waste discharged by Daya Bay nuclear power station.The flow field and material field of Daya Bay nuclear power station were simulated secondly. Flow field use upwind format, uniform grid of computation region and calculate the velocity and water level at different times of each grid. In order to maintain the conservation of particles, material field use Monte Carlo method. Though tracking a large number of particles and simulate the distribution in the temporal and special. The actual data have verified the correction of the model of flow field and material field.Then the transportation of radioactive material was simulated in the given water level and in the effect of wind and tidal. The simulation results confirm that the wind affect the transport of material. How quickly the material transport is related to wind speed,wind directions and so on, the greater the wind speed is, the faster the materials transport, west wind and north wind are conductive to the material transport. So the more material can be discharged in favorable time and less material can be discharged in unfavorable time to minimize the effects of radioactive material to surrounding sea.
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