Abstract
Embedded Flaw Repair technique has been developed in JSME S NA-1. The technique is applied to prevent propagation of Stress Corrosion Crack (SCC). The welding metal with high corrosion resistance is embedded on the surface of component, and could protect cracking part from the aggressive primary water. In this method, the crack is not fully removed from the component. After discussion in JSME, inspection rules after application of Embedded Flaw Repair were established for penetrations of Class 1 vessel's penetration (for example, reactor vessel head penetration and bottom mounted instrument in PWR) and reactor internal components. The focus of discussion is placed on whether the flaw should be monitored by nondestructive inspection. This document describes the technical aspects that JSME code committee studied, such as, flaw evaluation, tolerance of components with defects, inspectability of defects in seal-welded components and the operating experiences of repaired components at U.S. plants. Finally, in-service inspection items for a component repaired by Embedded flaw technique are proposed.
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