Patent Number: 
Section: claims

1. A method of manufacturing a reactor internal structure, comprising the steps of:applying a titanium-zirconium compound solution to at least a part of a surface of the reactor internal structure constituting a boiling water reactor, the part being exposed to a reactor water; andforming a coating of amorphous zirconium titanate by heat-treating the exposed part of the surface of the reactor internal structure coated with the solution, so that the surface of the reactor internal structure has a negative surface potential. 2. The method of manufacturing a reactor internal structure according to claim 1, wherein the titanium-zirconium compound solution has a one-to-one atomic ratio of titanium to zirconium. 3. The method of manufacturing a reactor internal structure according to claim 1, wherein the heat treatment is performed at 80° C. to 600° C. 4. The method of manufacturing a reactor internal structure according to claim 1, wherein the coating has a thickness of 0.01 μm to 10 μm.