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On January 25th, the narrow gap automatic welding technology with international advanced level was formally applied in the main pipeline welding of No. 1 generating unit of Ningde Nuclear Power Station. This is the first time that automatic welding technology was used in China's nuclear power construction. According to reports, the application of the main pipeline automatic welding technology has filled a gap in China's nuclear power construction field, marking that the CPR1000 project, which currently accounts for more than half of China's nuclear power plant under construction, will fully enter the era of main pipeline automatic welding technology. The picture shows the technicians performing automatic welding technology operation on the No. 1 unit main pipeline of the Ningde Nuclear Power Station in Fujian Province.