Fouling is a thick/dense oxide crud layer,over time,on components exposed to high flow water,such as the nozzles and throat areas of jet pump assemblies,impellers,condenser tubes,and steam generator parts.This crud buildup substantially reduces water velocities and degrades the performance of the recirculation system.This degradation will affect the efficiency of the plant because the recirculation pumps must be run at a higher speed to maintain core flow.Eventually,the jet pump inlet mixer(including the nozzles and throat area)must be either mechanically cleaned with a high pressure spray or replaced.This is a costly and time consuming procedure.It has been found that,applying a thin layer of TiO2 coating by chemical vapor deposition(CVD)improves the efficiency of the jet pump by mitigating the fouling mechanism.It is a cost effective method,which reduces the oxide fouling mechanism,increases core flow and potentially eliminates the cleaning process.This paper will present the technical details on the performance of CVD-TiO2 coating at laboratory and BWR plant.