Abstract
Aging is a natural phenomenon which leads to degradation of the materials, components, and structures to various degrees as the age of an engineering plant increases. Life extension of aged components beyond the design life has to be based on detailed assessment methods for these components. In this paper, the life assessment methods for nuclear power plant components are reviewed, in which the key components such as reactor pressure vessels (vessel plates, nozzles, and internals), pipings, steam turbine rotors, condensers, heaters, and valves, etc., are emphasized. Each component is evaluated based on its major aging mechanism, followed by the regulatory requirements, design code, literature/experimental data, and statistics of operation histories. Comments on the aging processes reviewed in the EPRI Industry Reports (IRs) are also referred to in this paper.
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