Methodology for Analysis of Safety Improvements of SSCs for Operation License Extension of Nuclear Power Plants

Before reaching the design lifetime of nuclear power plants, most operating nuclear power plants choose to apply for continued operation, and safety improvements is an important task for nuclear power plants to apply for continued operation. We have studied the operation license renewal (OLE) method for nuclear power plants internationally, and conducted research on the safety improvements analysis requirements in both the license renewal (LR) in the United States and the long term operation (LTO) in IAEA. Firstly, this article summarizes the safety important improvements of systems, structures and components (SSCs) completed by a certain power plant in China to meet the requirements of operating license renewal. Secondly analyzes and evaluates the characteristics of the operating license renewal safety improvements, and provides examples to analyze the key issues of safety important improvements in a certain nuclear power plant. Finally, suggestions are made for the relevant work of nuclear power plants in China.