As existing pressurized water reactors have been restarted and their operation periods extended in order to achieve both decarbonization of power sources and stable power supply, efforts to realize innovative light water reactors, and the development of fast reactors and high-temperature gas-cooled reactors, have progressed. For long-term maintenance of nuclear power plants, establishing eddy current test inspection technology for steam generator heat-transfer tubes of various specifications is needed. Consequently, a prototype of an insertion type cross coil array eddy current test probe with high customizability has been developed using the additive manufacturing method, which can fabricate parts with structures and shapes that cannot be created by conventional machining techniques, and verified. As a result, the possibility of providing probe with heat-transfer tubes of various specifications, while maintaining the same performance and quality as conventional probe, was obtained.
