Techniques in detect selective leaching in metal components

Abstract

Selective leaching is a corrosion type in, in which certain element in an alloy is preferentially removed from a material, leaving behind a porous or weakened material that can affect its quality and structural integrity. Evaluating the quality of components affected by selective leaching often involves several inspection techniques and assessment methods to determine the extent and severity of degradation. In this paper, we will describe the main techniques that are used in detect selective leaching in metals and the advantages and disadvantages of each. In addition, visual indicators of the presence of selective leaching will be presented. Selective leaching can significantly affect the long-term operation (LTO) of a nuclear power plant (NPP) by compromising safety, structural integrity, and potentially leading to radioactive material release. Due to the fact, Selective Leaching Detection Program is a requirement of the current national regulatory authority, there is a need to know the techniques for early detection of defects and failures in Structures, Systems and Components (SSCs) due to selective leaching, enabling immediate corrections and minimizing resources and replacements.  Hence, the importance of this paper to Angra 1 NPP. As a result of this work, it provides a guide that will deal with the fundamental techniques used for manage and mitigate the risks associated with this phenomenon.