In the context of global energy transition low-carbon development, extending the operating life of nuclear power plants is of great significance for improving energy utilization efficiency and economic benefits. Fatigue failure is one of main forms of failure in equipment and piping, and the accumulated fatigue usage factor will affect the equipment life and life extension, which can lead to pipe leakage and equipment in severe cases, causing unplanned reactor shutdowns. Within the design life of the nuclear power plant, in order to ensure the integrity of the reactor coolant system boundary and reduce the risk of fatigue and stress accumulation in key equipment in high temperature, high pressure and high radiation environments, it is necessary to statistically classify and analyze operating transients and formulate corresponding countermeasures. This study develops a system to provide data support for aging management and life extension, solve the problems of plant classification and statistics, and lay a technical foundation for ensuring the safe operation and life extension of nuclear power plants within their design life.