Strontium-90 transport parameters from source term to aquifer in the Chernobyl Pilot Site

摘要: Results are presented from multidisciplinary radiological and hydrogeological studies of process parameters controlling 90 Sr releases the shallow trench containing nuclear fuel particles subsequent radionuclide transport in underlying eolian alluvial sand aquifer at Chernobyl Pilot Site located 2.5 km distance NPP. Microscopic analyses separated waste have identified two families particles: U-O Zr-U-O (~25% 75% respectively). The Zr-containing exhibits low dissolution rate, therefore inventory source term available for migration is significantly less than estimated before. velocity layer ≈ 7% real groundwater flow (K d 3 ml/g). Alluvial sediments comprising middle part notably higher sorption capacity 20 ml/g), may represent essential natural barrier to geo-migration. Radioactivity balance calculations show that 4 - initial has migrated by now geological environment. Presented results important implications on safety assessment remedial radioactive dumps ChNPP.