Abstract: This paper takes the electric penetration assembly (EPA) of Qinshan NPP as the research object, based on the existing EPA design, manufacturing, qualification and actual operation data, combined with domestic and foreign standards, specifications and latest research results of equipment qualification, aging and life extension management of NPPs, the re-qualification method of equipment life extension of NPPs is studied. Considering the current status of aging management of 1E nuclear safety equipment such as EPA in domestic NPPs, this paper proposes the equipment aging management recommendations.