Study on PSA method applied to SSC aging sensitive screening and classification in nuclear power plant

Abstract

In order to extend the operation license of nuclear power plant, the nuclear safety during the extended service life must be considered, so as to ensure that the nuclear safety level of nuclear power unit during the extended service life is not lower than that of the original design life. PSA technology can be used to establish an aging PSA model for nuclear power plants during the license extension period, so as to evaluate the impact of SSC aging on the overall safety of nuclear power plants and verify that it can still meet the original design standards. Based on this, the SSC screening analysis method applied to aging PSA of nuclear power plant is put forward. By considering trend analysis, aging failure mode and impact analysis, risk importance analysis, the decision matrix of SSC screening for nuclear power plant is established on the basis of three analysis methods, and a feasible method is established for selecting aging and safety important components. This work also lays a technical foundation for the risk management of nuclear power plants in the license extension stage.