Transport of radioactive pollution occurs both in dissolved form and with sediments. While in normal operation, thermal pollution from nuclear power station at Rivne (of the same type as Chernobyl), Ukraine on the Styr River is reported to be negligible. Concentration of 137Cs and 90Sr radionu-clids in the surface waters at monitoring stations near the Roven-skaya nuclear power plant, as well as in industrial wastewaters and storm waters, is insignificant and does not exceed permissible limits (12-15 times lower).