Abstract
Ageing and plant life management (AM and PLiM) approaches for pressurized light water cooled and moderated reactors (PWRs) are discussed with the focus on major systems, structures and components (SSCs) important for safe and reliable operation and overall plant life. An overview of the PWR nuclear steam supply system (NSSS), SSCs and selected examples of operational experience concerning SSC ageing degradation (SSC-AD) is given. Important SSC-AD mechanisms and their mitigation methods are explained. Requirements and operational strategies are discussed with the view to ensure that PWR NPPs always maintain sufficient SSC safety margins in the most cost-effective way. The importance of fundamental research into SSC-AD is emphasized, as is the necessity to robustly integrate science-based knowledge into all facets of NPP manufacture, operation and regulation.
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