The paper describes the development of artificial radionuclides activity concentrations in the recipient of the nuclear power plant waste water and its tributaries, uninfluenced by the power plant. The activity concentrations of caesium 137 and strontium 90 are permanently decreasing during the monitored period 1990-2012.
Activity concentrations of tritium, detected in river sites not affected by Temelín nuclear plant, are slowly decreasing and their values are substantially lower than those on the sites affected by the plant. The nuclear power plant operation caused an increase of tritium activity concentrations downstream from the plant.
Radionuclides amounts released after the power plant\\\\\\\\\\\\\\\'s extension are estimated.