In the overall life cycle management of nuclear power plants, carrying out the experience feedback from the operation stage to the engineering design, manufacturing, construction, and commissioning stages provides important support for enhancing the reliability of system equipment during the engineering phase of both under-construction and proposed nuclear power plants. This research elaborates on the practical outcomes of the operation-to-engineering experience feedback management work within nuclear power plants. Specifically, a hierarchical management approach is implemented for experience feedback events that hold engineering feedback value. For events with significant feedback value, comprehensive integration of multi-professional technical resources from within CGN, including engineering, under-construction units, and platform companies, is carried out to establish multiple verification, closure, and control checkpoints, thereby achieving a closed-loop management mode. Furthermore, in conjunction with the evaluation work prior to the commercial operation of under-construction units, the improvement effectiveness of experience feedback is examined. Taking the significant experience feedback related to design and installation of medium voltage cables as an example, a detailed analysis is provided on how to eliminate potential risks and hazards from the initial stage of engineering design and construction through this process, effectively curbing the recurrence of important experiences, and thus offering robust guarantees and support for the continuous enhancement of the safety level of nuclear power plants and the efficiency of nuclear safety supervision.