Section 1 introduces the background, definition of terminology and related IAEA publications and Section 2 discusses the current trend of PLiM observed in NPPs to date and an overview of PLiM programmes and considerations. This includes key objectives of such programmes, regulatory considerations, an overall integrated approach, organizational and technology infrastructure considerations, importance of effective plant data management and finally, human issues related to ageing, and finally integration of PLiM with economic planning. Section 3 discusses general approach to HWR PLiM, including the key PLiM processes, life assessment for critical structures and components, conditions assessment of structures and components and obsolesces. It also gives regulatory consideration both for design life and for

long term operation. Section 4 presents conclusions and recommendations. In the appendices, technical aspects are described on component specific technology considerations for ageing assessment, example of a proactive ageing management programme, and Ontario Power Generation (OPG) experiences on common systems for multi units. In addition, country reports of Canada, India, the Republic of Korea, Romania and Argentina are attached as annexes.