MHI is developing a next-generation pressurized water reactor (PWR), featuring globally unrivalled economy and safety in the post-2030 market. MHI defines this reactor as the final PWR model that incorporates innovative advanced technologies based on the APWR design and set to become the global standard. The goal of this next-generation PWR is to achieve the three "S" elements (safety, security, and safeguard) under the basic design concepts of "environmentally-friendly", "highly effective", and "economical." This article describes the developments of those elemental technologies necessary to achieve this goal: (1) high-performance core, (2) advanced safety system, (3) seismic isolator, (4) steam generator heat transfer tube material, and (5) hull-structured containment.