EPRI has been supporting the nuclear industry over the last several decades to provide the technical bases and research to support the operation of the current fleet of nuclear power plants beyond their initial licensing period (typically 30-40 years of operation). Hundreds of technical reports and guidance documents have been issued on topics ranging from developing and implementing aging management programs, identification, and evaluation of degradation mechanisms, and remaining useful life of key passive components (e.g., reactor vessel internals, cables, and concrete). A previous 2019 ANS Environmental Degradation Conference paper discussed the research goals and results of EPRI up to 2019 for concrete and cables. These research results provide a living technical basis as these results are supplemented regularly with industry operating experience, inspection results, and condition monitoring or non-destructive evaluations.