PWRs have Reactor Coolant Pumps, which are dedicated to circulating reactor coolant to extract the thermal energy generated by the reactor. Mitsubishi Heavy Industries, Ltd. has delivered Reactor Coolant Pumps to PWR plants in Japan and overseas, and accumulated a great deal of technical knowledge and experience. By feeding back the accumulated knowledge and experience, we have solved the problems of conventional Reactor Coolant Pumps and developed a new type of Reactor Coolant Pump with a large capacity and high reliability that is suitable for the specifications of the SRZ-1200 advanced light water reactor.