Ningde City Million kilowatts Conventional Island Generator Shaft Manufacturing Successful

The rotor of the 1 million kilowatt conventional island generator of Ningde Unit 3 was successfully built and shipped in China. This is another result of the independent manufacture of large-scale nuclear castings and forgings of China's nuclear power.

As a major landmark project for the construction of self-contained and domestically produced nuclear power units with millions of kilowatts in China, and the second-generation demonstration project for improved nuclear power technology standardization and serialization in China, Ningde Nuclear Power's first-phase project is responsible for promoting China’s autonomous nuclear power system. With the heavy responsibility for construction, 4 units will achieve the goal of integrated localization rate of not less than 80%. Among them, the half-speed rotor of the whole-forging generator is the core component of the conventional island generator set of a million kilowatt nuclear power plant, and it needs to operate under high-speed, high-temperature and high-pressure conditions. The material performance and processing accuracy are very strict, and the finished product weighs 226 tons. The use of ultra-large 600 ton-grade high-purity, high-alloy steel ingots forging is the highest indication of the comprehensive technical level of thermal processing in manufacturing companies.

China’s first priority is market demand-oriented, relying on major engineering projects, aiming at independent manufacturing and substitution of imports, actively developing autonomous development of millions of kilowatts of nuclear energy equipment, and planning and implementation of “high starting point, high standards, and systematicness”. Major breakthroughs have been made in a series of major technological transformation projects to improve the manufacturing capabilities of nuclear power equipment. At present, China Yizhong has fully grasped the key technologies of “second-generation improved” and “third-generation” nuclear island key casting and forging technologies. “The nuclear island key castings and forgings have been mass-produced. At the same time, China has successfully developed the first reactor pressure vessel with a million-kilowatt reactor pressure vessel in Hongyanhe, which has completely independent intellectual property rights, and has formed an annual output of 5 sets. The production capacity of large-scale castings and forgings required for the primary equipment of 1 million kilowatts of nuclear island primary circuits, 10 sets of nuclear island primary circuits, and 5 sets of conventional island equipment.

China National Heavy Industries Co., Ltd. cooperated with domestic scientific research institutes to carry out basic research on the process and successively overcame many key technical difficulties, such as high-purity molten steel smelting and ingot casting, central compaction forging of super-large steel ingots, and fine-grained heat treatment of super-large cross-section forgings. Million kilowatts of conventional island half-speed generator rotor forgings. At the same time, China's top-developed AP1000 conventional island unit has also made breakthrough progress in the forging of low-pressure rotors: It has successfully produced 619 tons of whole-forging low-pressure rotor steel ingots, and it will soon manufacture the world's largest CAP1400 conventional island unit. Forging of low-pressure rotor ingots.