16-29: Comparison Of Fouling Kinetics On Four Different Fills Operated InEDF operates 30 condenser open cooling circuits in its French nuclear power plants (NPP). In order to extend their lifetime, the company has to carry out major renovations of the fills located in the cooling towers, which need to be replaced after around 30 years. The choice of a fill is determined by the results of preliminary tests. The following tests are conducted on fill: mechanical strength, fire resistance, thermal performance, and evaluation