Chapter of Repair, Replacement Activities (RRA) in Fitness-For-Service (FFS) Code of the Japanese Society of Mechanical Engineers (JSME) includes rules of article RB-3000 for temporary repair techniques in the use of covering leakage during operation of a Nuclear Power Plant (NPP). Temporary repair techniques are RB-3010 Plating, RB-3020 Adhesion and RB-3030 Infill. In this paper, rules of these temporary repair techniques are summarized as well as the meaning of ‘temporary’, intention and benefit of them.

On the other hand, these rules of temporary repair techniques were provided by Thermal and Nuclear Power Engineering Society (TENPES) at first in 1986, about thirty years ago. “Plant Operation and Maintenance Standards (POMS) Plan” developed by Japan Power Engineering and Inspection Corporation (JAPEIC) in 1996 incorporated those rules of temporary repair techniques, then JSME FFS Code has taken over them from POMS. Because the design rules of these temporary repair techniques have had much margin since origin, it may result in excessive design, or time-consuming procurement of parts. Especially, since these temporary repair techniques are often applied to the leakage around valve gland and flange, simpler and more practical modified rules could provide more benefit for effective repair activities. In this paper, an orientation of possible revision is described on temporary repair techniques rules in JSME FFS Code.

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