Water-spent fuel and water-granite interaction in Beishan ARea, a potential area for China HLW repository, have been studied using EQ3/6 geochemical codes, and the results are reported in this paper. The modeling shows that a lot of secondary minerals which contain the components of the spent fuel have been generated due to the interaction between spent fuel and groundwater of Beishan Wuyi well. The formation of the secondary minerals could not only decrease the concentrations of the radionuclides in the groundwater, but also fill and block the pores in the rock, and reduce the velocity of groundwater. These processes are very important to prevent the nuclides from migrating into the human's environment. The most significant feature for the interaction between groundwater and granite from Beishan area is the precipitation of large amount of the clay minerals, such as montmor, smectdi, nontronite, beidellite and so on, in the later stage of the reaction. All of them have very strong adsorptivity for the nuclides. So the granite of Beishan ARea is favorable to the construction of HLW repository.
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