Review of Operating Experience Involving Material Degradation in Periods of Extended and Long-Term Operation

Abstract The Nuclear Energy Agency (NEA) Component Operational Experience, Degradation and Ageing Program (CODAP) is the continuation of the 2002-2011 OECD/NEA Pipe Failure Data Exchange Project (OPDE) and the 2006-2010 OECD/NEA Stress Corrosion Cracking Project. In December 2023, 14 nations entered into an agreement for CODAP’s fourth term (2024-2026). The CODAP project periodically prepares topical reports on the results of systematic evaluations of the international operating experience with piping and selected non-piping passive components. An overriding objective of these reports is to foster technical cooperation, to deepen the understanding of national differences in plant ageing management, and to preserve the institutional knowledge with respect to material degradation phenomena. This paper presents the results of an evaluation of material degradation in periods of extended (PEO) and long term operation (LTO) of commercial nuclear power plants.