Abstract: The disposal of the radioactive wastes are the key factor for sustainable development of nuclear energy. The research of groundwater flow field in the has an immediate guidance in the selection of Low and Intermediate Level Radio Active Waste (LILW) disposal site, environmental impact assessment, site arrangement, engineering construction cost and schedule, operation as well as maintenance, etc.. The numerical model was established to simulate the groundwater flow in the potential LILW disposal site. The model verification and calibration were achieved by the analysis of the long term groundwater observation data at the site. The calibrated model was used to groundwater flow field of the site after the filling operation. The results indicate that, after the site earthwork, the low valley areas were filled. The prevailing groundwater flow direction gradually turns from the east to the west with time. The groundwater gradient generally decreases after the earthwork.

Key words: Low and Intermediate Level Radio Active Waste, Disposal Site, Groundwater, Numerical Simulation