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Recently, the VVER-1000 unit horizontal steam generator heat transfer tube eddy current inspection equipment and technology independently developed by China National Nuclear Corporation has been successfully applied in Tianwan Nuclear Power Unit 3. This move broke China's dependence on foreign imported equipment in this field, marking that China National Nuclear Corporation fully grasped the in-service inspection technology of key equipment of VVER units. The equipment can achieve precise and fast positioning, high stability, greatly improve the inspection efficiency, and lay the foundation for the subsequent unit overhaul and commissioning optimization, in-service inspection capability and nuclear power operation and maintenance technology "going out".
The steam generator heat transfer tube is the weakest link in the primary circuit pressure boundary of the nuclear power plant, and is also the focus of in-service supervision during the operation of the nuclear power unit. At present, advanced eddy current inspection equipment and technology for horizontal steam generator heat transfer tubes are only available in a few countries. Before and during the pre-service and overhaul period of Units 1 and 2, the eddy current inspection of the steam generator heat transfer tube was carried out using imported equipment. Since the core design parameters cannot be mastered, the reliability of the inspection equipment has always been the focus and difficulty in the eddy current inspection process, and also limits the inspection technology and the optimization of the overhaul period.
Since 2012, Jiangsu Nuclear Power and China Nuclear Wuhan Nuclear Power Operation Technology Co., Ltd. have initiated the independent research on horizontal steam generator eddy current inspection equipment, and formed a research plan in 2013. Through nearly 4 years of research and development, it has overcome the key technical processes such as eddy current probe development, equipment prototype manufacturing and testing, and formal equipment finalization, and finally successfully applied in the pre-service inspection of Unit 3.