en.Wedoany.com Reported - At 8:02 AM on June 15, the dome of Unit 5 at CGN's Ningde Nuclear Power Plant was successfully hoisted with high quality, marking the transition of this "Hualong One" nuclear power unit from the civil construction phase to the equipment installation phase, laying a solid foundation for subsequent installation, commissioning, and grid connection.
The nuclear island dome is the core safety barrier of the reactor building, bearing the critical mission of ensuring the structural integrity, sealing, and radioactive containment of the reactor building. The dome of Unit 5 at Ningde Nuclear Power Plant is a hemispherical double-curved shell structure, precisely assembled from main steel plates, angle steel ribs, shear studs, and various internal supporting components. It has a diameter of approximately 45 meters, a total weight of over 270 tons, and an area equivalent to four standard basketball courts.
On the day of the operation, after strict monitoring, all indicators including on-site wind speed, temperature, and equipment conditions met the highest construction standards, and the hoisting operation officially commenced. A large crawler crane lifted smoothly, sequentially completing a series of high-precision coordinated operations such as vertical lifting, in-air rotation, load-bearing travel, height fine-tuning, precise alignment, and slow positioning. The dome was raised to a height equivalent to nearly 20 stories, docking with the nuclear island steel liner cylinder, which has a thickness of only 6 millimeters, achieving a tight fit in one go. The entire process was safe, orderly, and controllable. Ultimately, taking 2 hours and 45 minutes, the dome of Unit 5 at Ningde Nuclear Power Plant was successfully hoisted with high precision in a single attempt.
The CGN Ningde Nuclear Power Project is an important clean energy base on the southeast coast of China and the first nuclear power project in Fujian Province to commence construction and be put into operation. It plans to build six million-kilowatt-class nuclear power units, implemented in two phases. The four units of Phase I were fully completed and put into operation in 2016. As of the end of March 2026, the cumulative on-grid electricity has exceeded 347 billion kilowatt-hours. Phase II, consisting of Units 5 and 6, received national approval on July 31, 2023, with main construction starting in 2024 and 2025 respectively, adopting China's independently developed third-generation nuclear power technology, "Hualong One."
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