Nuclear ring crane. In response to the CPC central committee and the state council put forward the "introduction of AP three generation nuclear power technology, unified technical route, realize the self-independence of nuclear power development" of the major strategic decisions, and annular crane group to develop nuclear power technology, through the general staff and technical personnel in nearly three years of hard work and hard efforts, overcome the technical transformation and foreign parts delivery, and many other difficulties, the bearing capacity of 726 tons, the current carrying capacity of the largest in the world of the annular crane manufacturing complete at last, the relevant departments of the whole equipment completion acceptance. The successful manufacture of AP1000 ring crane is of great significance to improving the capability of nuclear power in China and promoting the safe and efficient development of nuclear power.