The main components that compose the reactor cooling system of a PWR nuclear power plant are vital for safety, and their safety and reliability are guaranteed by implementing periodical inspections, repairs and replacement. Mitsubishi Heavy Industries, Ltd. completed the world's first all-in-one-piece extraction and replacement work of core internals in a 3-loop PWR plant in 2021. In addition, by developing an unprecedented original inspection and cleaning technology of steam generators, investigation and countermeasure of the heat transfer tube thinning event became possible. As a comprehensive nuclear plant manufacturer, we will continue to undertake initiatives to develop technologies and contribute to the further improvement of safety and reliability of plants as well as the long-term operation.
