| The main pump of nuclear power plant operates uninterrupted for a long time in a hightemperature and high-pressure environment.It not only provides the driving force for the coolant water,but also ensures the integrity of the primary circuit boundary.The key to its research and manufacturing is reliability design,analysis and verification,so that the reliability level of the main pump reaches the specified target.The main pump is a typical high-value,small sample,long-life complex electromechanical product.Based on the reliability research project of shaft-sealed main pumps in nuclear power plants,the comprehensive analysis of main pump reliability and closed-loop error correction technology for the reliability design and analysis of main pumps in engineering is studied in this paper.Firstly,on the basis of investigated the existing reliability research data of the main pump,a new method for reliability modeling of the main pump by combining function modules and failure modes is demonstrated in this paper.Function modules failure and non-function failure model of main pump are studied,then a new method of reliability modeling is proposed.This modeling method accords with the characteristics of the main pump,and establishes the reliability model of the main pump.Secondly,a comprehensive analysis method for the reliability of the main pump is proposed.The FMEA analysis method alone can only qualitatively analyze the main pump.It cannot solve the lack of reliability data of the main pump,the high overall test cost,the difficulty of evaluated the reliability of the main pump,and problems with better reliability growth.Therefore,FRACAS is combined with FMEA,reliability model,and reliability growth to form a comprehensive analysis method,which comprehensively used the reliability test data of the main pump components,while correcting the failure,the failure data can be used to correct the FMEA,evaluate the reliability of the main pump and reliability growth of main pump.When product test is failed,on the one hand,the FMEA results during product design period can be used in the FRACAS process to identify the cause and mechanism of the failed;On the other hand,the failed can be accumulated into the product’s knowledge base and fed back to the FMEA analysis,so the FMEA is updated.At the same time,the failure of the test is found and corrected,and the reliability of the product is increased and could evaluate the reliability of main pump.In this way,the failure data of the main pump is comprehensively analyzed and fed back to other reliability analysis,so that researchers can carry out reliability work more efficiently,comprehensively and accurately,and used the experience of the passive standstill seal research and development process to illustrate the reliability of the product,described the importance of comprehensive analysis.Finally,a closed-loop error correction system is designed and developed.Closed-loop error correction technology is an important part of the comprehensive analysis of driving reliability.There are many people involved in closed-loop error correction.The implementation process is complex.The use of computer technology can reduce the workload of reliability and establish a knowledge base of product failure information.So,design a closed-loop error correction system to assist engineering personnel in performing a closed-loop error correction process,developed the main pump closed-loop error correction system program based on B/S architecture and completed the corresponding program test.The system has practicability,which facilitates the engineer store and comprehensively analyze failure data and improve reliability and efficiency. |
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