The advanced light water reactor SRZ-1200 is a 1,200-MW-class power reactor that is designed to provide a stable energy supply for Japan in the future, has greater safety than conventional pressurized light water reactors and is being developed based on new regulatory standards reflecting what has been learned from the Fukushima Daiichi Accident, to improve safety, reliability and economic efficiency. To achieve this, the reactor vessel and reactor internals, which are some of the primary components, adopt a top mounted in-core instrumentation system, and reduce the volume of the reactor vessel's lower part to improve plant safety. The steam generator adopts 3/4-inch heat transfer tubes and high-performance small-size primary separators and a secondary separator, and has improved reliability and economic efficiency by developing enhanced evaluation methods for flow-induced vibration and seismic resistance of the heat transfer tubes. The pressurizer adopts a large-capacity heater to reduce the total number of heaters by half to reduce the number of penetrations, and has a lower overall height to achieve a lower center of gravity and higher rigidity, thereby improving reliability.
