Paper deals with the investigation of the water bodies radionuclides contamination. The research is focused on the Dnipro water reservoir ecosystems reliability and radiation capacity assessment, as well as radionuclides transfer between the components of aquatic ecosystems within Chernobyl Exclusion Zone. Radiocapacity factor for 137Cs and 90Sr was determined for various reservoirs of Dnipro river. Box models of radionuclides transfer between biotic and abiotic components of the most contaminated lake ecosystems within Chernobyl Exclusion Zone, were built.
