The first batch of reactor coolant pipes of Sanmen Nuclear Power Unit 1, manufactured by Bohai Shipyard Group Co., Ltd., affiliated to China Shipbuilding Industry Group Corporation, was delivered in the first batch. This is the reactor main piping equipment submitted for the first unit of the independent support project of the AP1000 million kilowatt nuclear power plant. Its timely delivery is of great significance to ensure the construction progress of the first reactor of the AP1000 nuclear power plant, promote the safe development of the national nuclear power industry, and ensure the sustainable growth of energy demand of the national economy.
The AP1000 nuclear power technology is the third generation nuclear power technology introduced from Westinghouse in China. It is also the most advanced and the highest safety passive nuclear power technology for PWR in the world. As one of the seven key equipment of nuclear island, such as reactor pressure vessel, main pump and evaporator, main pipe is the key equipment connecting reactor pressure vessel, reactor coolant pump and steam generator, which is called "aorta" of nuclear power plant. In the technology transfer contract of AP1000, the main pipe is not only the only key equipment without technology transfer or technical support, but also the first attempt of manufacturing technology in the world compared with the main pipeline of other reactor types, and there is no experience for reference. The localization of AP1000 main pipe will drive the progress and development of domestic equipment manufacturing industry in important technical fields such as high-end stainless steel smelting, electroslag remelting, forging, machining, super large diameter and thick wall stainless steel pipe bending, which not only fills the gap in this field in China, but also reaches the world-class level.