Nuclear fuel assemblies are an indispensable and important part of nuclear reactors,and their quality is related to the safety and economy of the entire nuclear power plant.Damage detection of PWR spent fuel assemblies is an effective technical means to prevent nuclear power plant fuel rod ruptures,radioactive fission product leakage and other safety accidents..This paper firstly introduces the design of the automatic control scheme of the nuclear fuel assembly damage detection system,and explains the principle and components of the detection system.In the communication process of PLC,the impo...