The ring foundation of the world's first nuclear power ultra-large high-level seawater cooling tower was successfully closed

The circular foundation of the cooling tower is over 10 meters wide and over 2 meters thick. The concrete pouring method is constructed using the warehouse jumping method. It is divided into 24 warehouses and the amount of concrete in each warehouse is About 660 cubic meters, the total ring base concrete pouring volume is about 15,900 cubic meters.

In order to ensure the orderly advancement of ring foundation pouring, Zhanjiang Nuclear Power organized all participating units to work together to overcome difficulties and practice the " With the work philosophy of "doing the job at hand once and for all", we study and optimize the construction logic of cooling towers, coordinate the investment of construction manpower, machines and materials, and overcome the problems of domestic non-nuclear power project cooling tower construction experience, such as perennial high temperature, rain and frequent typhoons in the Lianjiang area. Affected by adverse weather, the construction logic among ring tower sub-items is complicated, the construction of large and ultra-hazardous projects with deep foundation pits is difficult, and safety risks are high.

At the same time, the innovative application of construction technology is strengthened. Before the ring base concrete is poured, various temperature values ​​​​of the concrete are fully verified through the pouring of simulation parts; during the process, a large-volume concrete intelligent temperature measurement system is used to realize the control Continuous concrete temperature measurement, intelligent prediction, and automatic early warning reduce temperature stress, effectively improve the quality of large-volume concrete construction, and ensure the safe and high-quality completion of ring foundation pouring.

The implementation of this project has realized the implementation and transformation of my country's major special technical achievements in ultra-large cooling towers. Through research on key technologies for super-large cooling towers, the State Nuclear Power Research Institute has conducted 28 tests, completed 124 research reports, developed 13 software, obtained 7 patent authorizations, 8 software copyrights, 11 technical secrets, and 3 proprietary technologies. item. This enables our country to have completely independent intellectual property rights for super-large natural ventilation cooling towers, master core technologies, and establish complete standards and systems for super-large towers.

The first phase of the Guangdong Lianjiang Nuclear Power Project plans to build two CAP1000 third-generation nuclear power units. It is the first in my country to adopt seawater secondary circulation cooling technology. For the first time, an ultra-large cooling tower was developed and used in the nuclear energy field. Each unit is equipped with a counter-flow natural ventilation high-level water collection tower. The tower is 218.7 meters high, with a zero-meter diameter of about 175 meters. The water spraying area of ​​a single tower is 20,000 square meters. It is the world's first nuclear power super-large cooling tower. Large-scale high-level water-collecting seawater cooling tower is mainly composed of foundation, inclined pillars, tower, water inlet central shaft, water distribution system, heat exchange filler, water collection system, main water collection tank, water eliminator, etc.

The application of seawater secondary circulation cooling technology in the Lianjiang nuclear power project will further enhance the environmental friendliness of nuclear power projects, broaden the layout and space for the development of nuclear power plant sites in my country, and provide opportunities for the development and construction of nuclear power plant sites in my country. Important examples and reference.

Editor-in-chief | Hao Yannan

Materials | Zhanjiang Nuclear Power Institute

Editor | Hao Cheng, Wang Xiuxuan, Zhang Yue