高経年化技術評価の高度化 -稼働プラントの経年劣化とシステム安全評価-
Study of System Safety Evaluation on LTO of National Project - Functional Degradation and System Safety Assessment of Nuclear Plants in Operation
著者:
宮野 廣 Hiroshi MIYANO 山口 彰 Akira YAMAGUCHI 出町 和之 Kazuyuki DEMACHI 松本 昌昭 Masaaki MATSUMOTO
発刊日:
公開日:
Functional DegradationLong term OperationNational ProjectNuclear PlantSystem Safety Assessment
概要
Since the Fukushima Dai-ichi accident, the importance of “system safety'' has been recognized anew. Particularly, system safety assessment of plants in operation from the various degradation perspectives, specifically, transition of time is very important. Accordingly, functional degradation will be the assessment target of degradation, and the changes in the safety standards and the concept of safety will be dealt with; where, the reliability assessment will be made on the consolidation of important functions under a system, and not on individual components.The boundary function of the system will be one of the focus in this study. For the purpose of reliability assessment on the syst em by evaluating and quantifying the damage risk of piping ? method for confirm g the soundness of the sysystem through the assessment on the damage risk of the system when an external force caused by an earthquake is applied was examined on the basis of the damage prediction results for each of the parts in piping system. The prediction results will be verified by tests, whereby, the improvement in reliability will be confirmed, and a combined assessment will be made in relation to the degradation factors of other systems. “System safety assessment method of plants in operation will be developed in a manner where a comprehensive assessment on the safety of the entire plant can be made.
