Construction and after-sales service of nuclear reactor facilities require construction technologies to fulfill a wide variety of design requirements in order to ensure safety and to allow the facilities to start/resume the operation in a short period of time. Furthermore, in recent years, further improvement of work efficiency and streamlining such as manpower saving are also required in response to the work style reform promoted in Japan. In order to meet these requirements, Mitsubishi Heavy Industries, Ltd. is working to identify issues faced in various construction projects and streamline and improve on-site work processes by upgrading the construction technology through expanding the scope of utilization of existing products and systems and utilizing the latest ICT technology.