Development of a reliability monitor for the safety related subsystem of a PWR considering the redundancy and maintenance of components by fault tree and GO-FLOW methodologies

HASHIM Muhammad, MATSUOKA Takeshi, and YANG Ming

College of Nuclear Science and Technology, Harbin Engineering University, Heilongjiang, Harbin, 150001 China
(hashimsajid@yahoo.com,mats@cc.utsunomiya-u.ac.jp, myang.heu@gmail.com)

Abstract: A reliability monitor checks the operating performance of each of the individual subsystems that comprise the whole system and display the reliability of the subsystems. By monitoring the reliability of individual subsystems, the operators of the plant can gain insight on potential performance bottlenecks to establish baseline performance. Monitoring the reliability of the subsystems also helps the plant operator to find problems before real loss of service occurs.
The GO-FLOW method is based on success-oriented system analysis technique. This technique is able to evaluate the system reliability and availability. An example analysis is conducted by GO-FLOW to obtain the dynamic reliability curve of the containment spray system in a PWR. It is shown by parametric analysis that the system reliability is increased by the redundant system configuration of the containment spray system.
Keyword: reliability monitor; dynamic reliability; GO-FLOW; containment spray; PWR