Optimal Analysis of Periodic Tests of Steam-Driven Auxiliary Feeding Pumps in QINSHAN Phase II NPP of CNNC

Abstract

By applying the risk-guided decision-making method based on PSA technology to carry out an overhaul optimization analysis for QINSHAN phase II NPP, the frequency of regular tests, preventive maintenance cycle and execution time can be determined more effectively and reasonably. On the premise of ensuring safety, reasonably optimize the overhaul workload, reasonably shorten the overhaul period, reduce the radiation dose of staff, reasonably reduce the unnecessary burden of the nuclear power plant, make more efficient use of resources, and further improve the safety, reliability and economy of the nuclear power plant in QINSHAN area. The analysis method used in this paper is the recommended method given by RG1.174 and RG1.177, and the judgment is given comprehensively. Combined with the characteristics of the PSA optimization project, the pilot project of the steam-driven auxiliary feed pump is used for the optimization analysis pilot for detailed analysis. According to the requirements of the overhaul optimization work, combined with the principle of project optimization and screening, the optimization objectives are formulated: under the condition that the test method is not adjusted temporarily, the main consideration is to extend the regular test period, thereby reducing the average annual test time. Through the optimization analysis, the safety of the optimized unit is determined, and the feasibility of the optimization project is demonstrated.