en.Wedoany.com Reported - On April 13, another achievement was reported for the "National Card" Hualong One. The outer dome of Unit 4 of the Hainan Changjiang Nuclear Power Plant, constructed by China Nuclear Industry 22nd Construction Co., Ltd., was successfully hoisted into place. This marks the entry of the civil construction for the second phase of the Changjiang Nuclear Power Plant project into the comprehensive finishing stage.
The preceding processes involved multiple critical steps, characterized by a tight schedule, heavy workload, intensive overlapping operations, and high construction difficulty. The project team cleared obstacles for the civil construction prior to the outer dome hoisting by strengthening supply-demand coordination, optimizing site layout, and upgrading pumping technology. They also fully addressed schedule pressure by continuously optimizing construction plans, implementing shift work, and enhancing resource allocation. Furthermore, construction techniques were optimized, replacing traditional procedures with combined pouring methods, laying a crucial foundation for the outer dome hoisting.
After the overall assembly and welding of the outer dome module was completed, welding the back rib angle steels and section steel tie rods became the first key challenge. The project team quickly assembled an elite task force of welders, ultimately completing all weld seam construction ahead of schedule with a one-time qualification rate of 100%, solidifying the foundation for the outer dome hoisting.
To address the challenges of easy deviation and difficult positioning during the hoisting of the steel liner, the project's technical team specially developed and applied a limit-guiding device. By installing limit devices at standard elevation sections and adding guide columns at corresponding positions on the outer dome steel liner, circumferential angle fine-tuning and positioning guidance during hoisting were achieved. This device effectively controlled the hoisting deviation of the steel liner to the millimeter level, ensuring a precise fit between the outer shell and the steel liner.
Facing the dual challenges of leveling the lower opening and controlling installation precision during the outer dome hoisting, the steel structure team innovatively adopted a 16-point uniformly distributed hoisting system for overall control, ensuring the dome was steadily positioned. For controlling critical connection nodes, specifically the corbel embedded parts—a core element affecting overall structural stability and sealing—the technical team pioneered an adjustable limit fixture, controlling installation error within the millimeter level. This fundamentally solved the problems of poor adaptability and scattered precision associated with traditional fixtures. These two processes, one for "overall" control and one for "specialized" precision, together formed a "double insurance" system for high-precision control of the outer dome hoisting.
From rehearsal to implementation, the entire hoisting process utilized 3D modeling technology. A full-scale digital model of the outer dome was constructed in advance to accurately simulate the hoisting path and key对接 points and perform collision detection, avoiding potential risks at the source. Relying on the 3D model, multi-level technical briefings and construction rehearsals were conducted, providing solid technical support for the successful one-time hoisting of the outer dome.
Upon completion and operation, the second phase of the Hainan Changjiang Nuclear Power Plant project will be able to supply 18 billion kilowatt-hours of clean electricity to Hainan Province annually. This is equivalent to reducing standard coal consumption by 5.5 million tons and cutting carbon dioxide emissions by 13 million tons, significantly boosting the construction of Hainan's clean energy island and the realization of the "dual carbon" goals. In the future, China Nuclear Industry 22nd Construction Co., Ltd. will continue to pursue excellence, steadily advancing various construction tasks for Units 3 and 4 while ensuring safety and quality, contributing to the project's early commissioning and power generation.
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