Abstract: To solve the problem that the stress corrosion cracking of the nickle-based weld normally occurs with the primary circuit coolant in pressurized water reactor nuclear power plants during operation, identifications, analyses and discussions were conducted on following repair technologies according to ASME BPVC standards, such as flaw removal, piping butt weld overlay, piping butt weld inlay or onlay, J groove weld embedment, J groove weld internal mid-wall surface repair, J groove weld outer surface pad repair, and J groove weld mechanical seal repair. This may serve as a reference for the repair technology selection of the nickle-based weld in nuclear pressure vessels.