At 17:06 on October 19th, after 9 hours of operation, the Hualong No. 1 Zhangzhou Nuclear Power Unit No. 1 reactor pressure vessel, which was first introduced for construction by the open-top method in China, was successfully introduced into place and successfully hoisted, and the nuclear power unit reactor was launched. The introduction of the optimal working speed for pressure vessels creates a prerequisite for subsequent dome hoisting and main pipeline welding.

The reactor pressure vessel is one of the core equipment of nuclear power plants, which carries an important safety barrier. As the "heart" of the nuclear power plant, the pressure vessel plays a role of fixing and supporting the internal components of the reactor, ensuring the support and positioning of the fuel assembly in the core at a certain interval, and as a part of the reactor coolant system, it plays a role in bearing the primary circuit The key role of the pressure boundary between the coolant and the external pressure difference.

The Hualong No. 1 pressure vessel was independently designed by the China Nuclear Power Research and Design Institute. Compared with the second-generation improved unit, the Hualong No. 1 pressure vessel manufacturing standard has been updated, and higher requirements are set for design, material development, welding, and machining, representing China's highest level of research and development of key equipment for the third-generation nuclear power technology.

The pressure vessel has a net weight of 316 tons and a hoisting weight of 461.8 tons, making it extremely difficult to flip, hoist and seat. The Zhangzhou nuclear power project team optimized the construction logic of the pressure vessel insulation layer, shortened the equipment turning and hoisting time, and adopted a new integrated e-type turning device to complete a series of actions such as turning and erecting, removing the holding ring, and lifting on the ground, which improved the one-time hoisting of the pressure vessel. Successful security.

The Zhangzhou nuclear power project management team upholds the spirit of the nuclear industry in the new era of “Strengthening Nuclear and Servicing the Country, Innovating and Dedicating”, quickly coordinated and resolved various constraints and problems, ensured the smooth installation of pressure vessels, and provided reliability for subsequent open-top construction of similar units Learn from the experience.

The Zhangzhou nuclear power project adopts China’s self-developed third-generation nuclear power technology Hualong 1, and the first unit officially started construction on October 16, 2019. The Zhangzhou nuclear power project management team has fully absorbed the construction experience of other third-generation nuclear power units at home and abroad, and has the courage to make breakthroughs and continuous innovations. Pre-introduction of main equipment, stainless steel first, modular construction and other construction methods and technological innovations. Since the start of construction, the impact of the epidemic has been overcome, safety and quality are fully controlled, project construction is in good condition, and the main line nodes have been fully realized on schedule. At present, the main nuclear island equipment such as reactor pressure vessels and steam generators have all been opened and put in place. According to the plan, the inner dome will be hoisted at the end of October.Editor/Baohongying