Nuclear Power Technologies

This is another major hoisting of the three generations of nuclear power technologies after Fuqing Nuclear Power Unit 5. The K2 nuclear island dome is the cap part of the steel lining of the containment vessel. Its external shape is a hemispherical shell with an inside radius of 23.4 meters. The hoisting load is 395 tons. It is one of the largest nuclear power plants with the heaviest and heaviest altitudes in the world. It is a high level of adjustment accuracy of equipment, allowing small errors; Second, the huge size of the equipment, the windward surface of the lifting process is very easy to cause equipment shaking; Third, the crane carrying more than 27 meters with a large span, increasing the lifting difficulty; Lifting height and docking accuracy is high, the allowable error of only 2 mm, the crane operating speed must be precise control. All units participating in the construction of China's nuclear construction will make concerted efforts to fully prepare and carefully organize them. They will always adhere to the principle of safety first and quality first, and successfully complete this lifting task.

CNNC Huaxing continuously optimized the construction process, made every effort to ensure the critical path, and successfully completed the large-scale hoisting task of the stainless steel pool module and the steel lining cylinder.

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 Especially during the prefabrication of the workshop during the 10 months of 2016, combined with the actual positive innovation at the site, the original design of the dome was re-partitioned, and the double-curved film was used to form a single process, curved panel automatic welding and "two in one" technology A variety of process innovation, effectively ensure the progress of K2 dome construction, quality and safety. It has created a record of 22.5 months from the end of the FCD to the end of the internal structure. Compared with the domestic reactors, it not only shortens the construction period by 1.5 months, but also completes the tasks of stacking stainless steel wall cladding and main equipment room decoration ahead of schedule. Three pre-introductions of steam generators and pressure vessels were completed, creating the prerequisites for the successful hoisting of the final domes, achieving the target node of 25 months from the FCD to dome hoisting.

China National Nuclear Machinery Co., Ltd. compiled a detailed operating plan for the hoisting crane of the dome and conducted various arguments on the operation program; preliminarily conducted site surveys to ensure the hoisting operation environment; and performed several debuggings on the crane before hoisting to simulate the on-site hoisting process. Pre-judgment and prevention of problems; complete safety technology disclosure and various safety measures to overcome the difficulties of large dimensions, weak structural strength, narrow equipment seating space, and complex construction techniques; and machinery such as on-site cranes before operation All aspects of operation, maintenance and maintenance of the equipment are checked in all directions. Precise hoisting monitoring is performed during the lifting process to ensure that each operation is safe and controllable.