Qinshan Nuclear Power Station is the first nuclear power station designed and built by itself in China. Connected to Haiyan County, located on the bank of Hangzhou Bay. Construction started on March 20th, 1985, 199 1 grid-connected power generation. With their wisdom and innovative spirit, the builders of Qinshan Nuclear Power Station overcame all kinds of difficulties and completed the construction of nuclear power stations that attracted worldwide attention.
The establishment of nuclear power plant is a big project, which needs to be composed of 65,438+000 systems containing a large number of equipment, components, instruments, meters and pipelines. There are more than 30 main and auxiliary systems such as reactors, primary circuits and secondary circuits, totaling 170 systems. Among them, there are 5000 sets of equipment, more than 9000 meters, more than 0/0000 valves/kloc, and hundreds of kilometers of pipelines.
Tong Dingchang, a nuclear energy expert, is fully responsible for the design of the core equipment of the nuclear power plant, such as the reactor body and the reactor building. Under his organization, he has overcome nearly 100 technical problems. After many sleepless nights, engineers and engineers combined foreign experience with China's concrete practice and adopted a three-stage process of filtration-evaporation-ion exchange, which made the radioactive concentration index of discharged wastewater lower than that of similar foreign countries.
In order to ensure the safety of Qinshan nuclear power plant and prevent the leakage of radioactive materials, cracks cannot appear in the large area concrete of more than 20,000 square meters on the ground of the nuclear island. The technicians of the nuclear power plant overcame various difficulties and completed the irrigation in June 1985. Two years later, there were no cracks, which surprised some foreign experts.
The construction of containment cylinder is also a technically difficult project. The containment workshop is a simplified cylindrical structure with a dome column height of 62.5m and a wall thickness of1m. It is the third barrier of nuclear island, and its quality requirements are quite high. The structural form of tensioned prestressed concrete containment was adopted by engineers and technicians, and it was a complete success.
1986, Qinshan nuclear power station entered the critical moment of construction-welding the main pipeline that runs through the pressure shell, steam generator and main pump stack. The main pipe has a diameter of 86 cm and a wall thickness of 7 cm. Covered electrode with a total weight of100 or more is used for a welded joint, and the welding error at both ends of the pipe should not exceed 0.5 mm ... This is a very difficult technology. Only France, the United States, Japan and other countries in the world can carry out independent construction. China engineers and technicians and Shanghai Institute of Nuclear Engineering spent a year and a half tackling key problems, and obtained more than 15000 data, and explored the best welding technology. By1October 25th, 1989 and 16 all the main loop pipelines were welded, and the one-time qualification rate was 99.23%. After a comprehensive inspection by the jury before the operation of the International Atomic Energy Agency, the welding quality is all excellent.
After four years' efforts, Qinshan Nuclear Power Station was finally connected to the grid at the end of 1990. The completion of Qinshan nuclear power plant will give the economic development of the southeast coastal areas a soaring wing.
The successful construction of Qinshan Nuclear Power Station in China shows the wisdom and great innovative spirit of the people of China. 1In April, 1989, the pre-operation safety review team sent by the International Atomic Energy Agency considered that "Qinshan Nuclear Power Station has high construction standards, comprehensive quality assurance, permeating all aspects of the project, and the equipment for start-up and operation is ahead of schedule".