This report was written by members of the Working Group on Integrity and Ageing of Components and Structures (WGIAGE) of the NEA, and the members of the metal subgroup were responsible for developing the responses in this report.
This activity was initiated by a CSNI activity proposal sheet (CAPS) on long-term operation (LTO) research that was approved in December 2009. The CAPS was proposed and led by the United States Nuclear Regulatory Commission (NRC), the CSNI representative from the United States.
The stated purpose of the CAPS is to identify technical areas of mutual interest related to age-related degradation of materials during long-term operation (LTO) of nuclear power plants (NPPs). The work of the CAPS was largely carried out by the metal subgroup members of WGIAGE. As a result, the responses focus on age-related degradation of materials of the long-lived metal components. However, there is also information associated with age-related degradation of concrete along with electrical and instrumentation and control (I&C) cables.