[1M04-06] Operation, Inspection and Maintenance

[1M05] Consideration of importance in the maintenance management of facility of the decommissioning phase

*Masao Uesaka¹, Kenta Murakami² (1. Nagaoka University of Technology, 2. The University of Tokyo)

Keywords:Decommissioning, Classification of importance, Maintenance, PRA, ROP

A nuclear power plant consists of tens of thousands of equipment and facilities. In order to maintain and manage these pieces of equipment and facilities, it is necessary to classify their importance and conduct appropriate inspections and resource allocation for each facility. In the case of operating plants, this concept has been developed based on the existing importance classification. On the other hand, decommissioning plants have different importance levels from those of operating plants because the requirements for safety functions change from the operation phase and there is no requirement to install criticality management facilities, but the concept has not been developed yet. In this study, based on data obtained from plant operation and maintenance records, we examined one path to the importance level in decommissioning plants, focusing on the relationship between risk and maintenance of facilities.