Patent Number: 
Section: claims

1. An apparatus defining a coolant flow passage in a nuclear reactor, the apparatus comprising:a base material, the base material being electrically conductive and having a surface configured to define a portion of the coolant flow passage;a base dielectric layer formed on the surface of the base material, the base dielectric layer being substantially continuous, the base dielectric layer being a Ta2O5 layer; andan outer dielectric layer formed on the base dielectric layer, the outer dielectric layer being substantially continuous, the outer dielectric layer defining a wetted surface in the coolant flow passage, the outer dielectric layer being a TiO2 layer, the outer dielectric layer being thicker than the base dielectric layer,wherein the outer dielectric layer has a thickness between about 0.5 to 3 μm. 2. The apparatus of claim 1, wherein the base dielectric layer has a thickness between about 0.1 to 2 μm. 3. The apparatus of claim 2, wherein the base dielectric layer has a thickness between about 0.1 to 0.5 μm. 4. The apparatus of claim 1, wherein the base dielectric layer has a thickness between about 0.1 to 0.5 μm.