Abstract
The operational lifetime of a nuclear power plant (NPP) is determined mostly by the actual condition of the materials from which the main equipment is made. This chapter addresses the impact of main operational effects (i.e. temperature, stresses, medium present) in causing ageing degradation in the NPP equipment. It also addresses the main mechanisms involved causing damage (e.g. corrosion, fatigue and creep) related to current and long-term operational effects and proposes experiment-calculated approaches to evaluate their impact on the integrity of equipment. Results of work on the analysis of ageing in systems, structures and components (SSCs) in Russian NPPs are presented as specific examples. The most efficient methods of in-situ (specimen-free) non-destructive monitoring and testing to detect ageing degradation are recommended.
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