Reliabilily assesment or HWR-Fugen; The method of manipulation of fault tree data base

Iguchi, Yukihiro  

In "Fugen", we started the project which evaluates the importance of the components of the plant in 1985, in order to improve the reliability of the plant effectively. The data base of the evaluation are mostly based on the disclosed databases of other reports and partly on the Maintenance Management System (MMS) data base. As a method of the evaluation, Fault Tree Analysis (FTA) is adopted. In 1987, we complete the fault tree of the plant shut-down, and coded all the data as FT data base. Moreover, we collected new data for future use such as maintenance items use and coded them also. In order to analyze the FT data base, we introduce SETS and FTD codes which are used in PNC often. And we developed a transforming program to apply FT database to SEST. This program can manipulate the trains of the components and their logic combination (e.g. 1 out of 2 twice) easily. And we also modified FTD so that it can plot out Japanese characters, because the event names of FT data base are written in Japanese. In future, these program will be used and improved as ATR Maintenance Instruction System (AMIS).