On the 4th, the automatic welding technology promotion meeting for stainless steel pool cladding of nuclear power stations on nuclear islands of nuclear power plants was held in Dalian to summarize and popularize the automatic welding technology of stainless steel for nuclear power to help the safe and efficient development of nuclear power plants. Previously verified by many parties and practical application on the site, this process fully meets the safety requirements for nuclear power construction and has a good promotion prospect. It will be gradually applied to the construction of third-generation nuclear power projects.

From the Nuclear and Radiation Safety Supervision Station of the Ministry of Environmental Protection, Jiangsu Nuclear Power Co., Ltd., Guangxi Fangcheng Nuclear Power Co., Ltd., Shanghai Nuclear Engineering Research and Design Institute, China Guangdong Nuclear Power Engineering Company, China Nuclear Power Engineering Co., Ltd., China Nuclear Engineering Co., Ltd., China National Central Foreign Engineering Co., Ltd. A total of more than 50 experts and leaders from various companies in the industry such as the company and Beijing Sida Bakers Engineering Supervision Co., Ltd. attended the meeting.

At the promotion and exchange meeting, the participating experts and leaders gave unanimous praise to the technology and expressed great confidence in its promotion prospects. Zhang Junbao, a senior engineer of the Shanghai Nuclear Engineering Design and Research Institute, pointed out that the stainless steel automatic welding process improves the welding quality and automation of steel cladding, shortens the cycle of nuclear power construction, and has a positive role in ensuring the safety of nuclear power. Chen Lihua, deputy chief engineer of China Guangdong Nuclear Power Engineering Co., Ltd., said that CNNC Huaxing’s independent innovation and research and development process is a domestic initiative and has reached the international advanced level. It plays an active role in improving construction quality, improving the labor environment, and ensuring nuclear safety. Through the application of the automatic welding process, the pass rate of one pass of welding is nearly 100%, the work efficiency is improved by two to three times, the welding quality is good, the efficiency is high, the cost is low, and it has the basis for popularizing to the third generation of nuclear power.

The stainless steel basin in a nuclear power plant is a nuclear grade equipment. Its main function is to provide a suitable clean environment for the operation of nuclear equipment, prevent radioactive materials from penetrating into the concrete structure inside the nuclear power plant, protect workers during operation, facilitate cleaning after nuclear power plant decommissioning, temporary storage of fuel, waste disposal, etc. The quality of its construction directly affects the safety of nuclear power plant operation.

It is understood that before the construction of domestic nuclear power plants, the field installation of stainless steel pool cover panels all use manual tungsten arc welding process, welding quality is relatively poor stability, welding efficiency can not be guaranteed, the situation is basically the same in foreign countries. In order to change this situation, in 2010, China Nuclear Huaxing launched a scientific research and innovation project of automatic tungsten-arc welding instead of manual welding process, and set up a special project research team by deploying experts and technical personnel with rich construction experience. After a series of scientific researches, this technology was finally applied for the first time in June this year for the first time in the welding construction of the refueling pool of the Unit 4 reactor of Hongyanhe Nuclear Power Station.

Compared with the traditional manual tungsten electrode argon arc welding process, the automatic welding process of stainless steel pool cladding installation has many clear advantages. It can ensure the quality of welds installed on site, reduce welding distortion, reduce the probability of manual operation affecting quality, reduce nuclear power construction costs, increase welding efficiency, and shorten construction period.

China’s nuclear power construction has been restarted. China’s nuclear construction, as the main force in the field of China’s nuclear power construction, has always been committed to promoting the research and development and innovation of nuclear power construction technology and technology, and continuously improving the construction capacity and construction level of nuclear power, which are of far-reaching significance for the development of nuclear power in China’s safe and efficient way. Strategic significance.