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Results are presented from multidisciplinary radiological and hydrogeological studies of process and parameters controlling W ST releases from the shallow trench containing nuclear fuel particles and subsequent radionuclide transport in the underlying eolian and alluvial sand aquifer at Chernobyl Pilot Site located at 2.5 km distance from the Chernobyl NPP. Microscopic analyses of fuel particles separated from waste have identified two families of particles: U-0 and Zr-U-0 (-25% and 75% of the fuel particles respectively). The Zj-contaming particles exhibits low dissolution rate, therefore radionuclide inventory in source term available for migration is significantly less than estimated before. The w Sr migration velocity in the eolian sand layer is estimated at =7% of real groundwater flow velocity (K