Process of manufacture a nuclear component with metal substrate by DLI-MOCVD and method against oxidation/hydriding of nuclear component

A process for manufacturing a nuclear component via a method of chemical vapor deposition of an organometallic compound by direct liquid injection (DLI-MOCVD), the nuclear component chosen from a nuclear fuel cladding, a spacer grid, a guide tube, a plate fuel or an absorber rod, comprising:

• i) a support containing a substrate based on a metal chosen from zirconium, titanium, vanadium, molybdenum or base alloys thereof, the substrate being coated or not with an interposed layer placed between the substrate and at least one protective layer;
• ii) said at least one protective layer coating said support and composed of a protective material comprising chromium chosen from a carbide of a chromium alloy, a chromium nitride, a chromium carbonitride, a mixed chromium silicon carbide, a mixed chromium silicon nitride, a mixed chromium silicon carbonitride, or mixtures thereof;
• and
• the process comprising the following successive steps:
• a) vaporizing a mother solution containing a hydrocarbon-based solvent free of oxygen atoms, a bis(arene) precursor comprising chromium;
• and containing, where appropriate, an additional precursor, a carbon incorporation inhibitor or a mixture thereof;
• the precursors having a decomposition temperature comprised between 300° C. and 600° C.;
• and
• b) in a chemical vapor deposition reactor in which is located said support to be covered and the atmosphere of which is at a deposition temperature comprised between 300° C. and 600° C. and at a deposition pressure comprised between 13 Pa and 7000 Pa;
• introducing the mother solution vaporized in step a), which brings about the deposition of said at least one protective layer on said support.