The original design life of a nuclear power plant (NPP) is commonly around 30– 40 years, depending on manufacture and type. However, the actual operational life may be shorter, or longer, based on many factors. Plant life management (PLiM) is a methodology that is appropriate for any length of plant operational life. The proceedings of this symposium reflect the growing interest of Member States in this topic and summarize the conclusions of six major programmatic sessions: approaches to plant life management; economics; ageing management and related operational programmes; system, structure and component design modification, modernization, refurbishment and replacement; managerial issues; and regulatory issues. This publication provides operators and regulators with a comprehensive overview of the state of the science and technology involved in the main issues concerning safe, long term operation, ageing management and the basic economic aspects of plant life management for the nuclear power industry.