Abstract
Groundwater contamination analysis is an essential part in modern society. For any potential contamination, it is important to deal with it as soon as possible. The destination of decommission of NPPs is deregulation and the land of NPPs can be transferred to other purposes. To achieve this, we should make a full investigation of radionuclide activities and the model of diffusion of contamination around the land. Some radionuclides may be discharged to the environment due to human negligence or improper operation; therefore, it is significant to predict the properties, location, the direction of radionuclides transport. This research is mainly divided into two parts. First, CFD (Computational Fluid Dynamics) analysis is adopted, taken into account of NPPs environment. This research will build a database depending on different releasing location and depth, different kinds of radionuclides. Second, with the data above dealt, we will analyze them will statistical program, training them with different methods to get best prediction results. At last, we can integrate both parts to trace the sources of contamination, ranges of pollution, time after it happened. Then, the status of decommission can be determined according to these results.