The bottom head, with a diameter of nearly 40 meters, a height of 11.5 meters, and a weight exceeding 800 tonnes, was hoisted into place on the central raft foundation using a 3,200-tonne crawler crane. Constructed from 64 arc-shaped steel plates welded together, this component forms a critical part of the steel containment vessel, which consists of five modules: the bottom head, three cylinder rings, and the top head.
CNI22 highlighted the use of advanced technologies to ensure precision during the installation. A 3D video simulation was conducted beforehand to rehearse the hoisting process, identifying and resolving potential issues. During the actual installation, 3D laser scanning modeling technology was employed to accurately position the bottom head on the containment vessel support structure. A CNI22 representative stated: “The installation of the containment vessel bottom head signifies the full commencement of the nuclear island reactor building’s main structure construction.”
The Lufeng nuclear power plant project began with the pouring of the first safety-related concrete for Unit 1’s nuclear island on February 24. This unit is the third to start construction at the site, which is planned to host six reactors. In September 2014, China’s National Development and Reform Commission approved the construction of four 1250 MWe CAP1000 reactors (Units 1-4) at Lufeng. The CAP1000 is a Chinese adaptation of the Westinghouse AP1000 design. Units 1 and 2 received State Council approval on August 19 of the previous year, while approvals for Units 3 and 4 are still pending.
Additionally, in April 2022, the State Council approved the construction of two Hualong One reactors as Units 5 and 6. Construction began with the first concrete poured for Unit 5 on September 8, 2022, and for Unit 6 on August 26, 2023. The Lufeng project underscores China’s commitment to expanding its nuclear energy capacity with advanced reactor designs.
The successful installation of the bottom head for Unit 1 advances the Lufeng plant’s development, contributing to the region’s sustainable energy goals. The project continues to progress with a focus on safety, precision, and technological innovation.
