Research on application of technique for analyzing system reliability, GO-FLOW

As the method of evaluation, probabilistic safety assessment (PSA) has been introduced in nuclear power field, and began to play important role in plant design and safety examination. In the Ship Research Institute, as the technique for analyzing system reliability which takes the main part of PSA, the research on developing the GO-FLOW technique which has various advanced functions has been carried out. In this research, the functions of the GO-FLOW technique are improved, and the function of the dynamic behavior analysis for systems and the analysis function for the combination of the physical behavior of systems and the change of probabilistic events are developed, further, the function of extracting main accident sequence by utilizing the GO-FLOW technique is prepared. As for the analysis of dynamic behavior, the sample problem on hold-up tank was investigated. As to the extraction of main accident sequence, the fundamental part of the function of event tree analysis was consolidated, and the function of setting branching probability was given. As to the indication of plant behavior, the simulator for improved marine reactor MRX was developed. (K.I.)