Abstract
Research is being conducted by ORNL for the USNRC to address aging of nuclear power plant (NPP) containment structures in light-water reactor plants. The importance and operating experience of nuclear power plant containments is reviewed. Factors that can lead to age-related degradation of containment metallic pressure boundaries (i.e., steel containments and liners of reinforced concrete containments) and reinforced concrete structures are identified and their manifestations described. Background information and data to develop methods to assess the effects of age-related degradation on structural performance are provided. Techniques for detection of degradation are reviewed and related research is presented. A probabilistic methodology for condition assessment and reliability-based life prediction is provided.
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