1. Background and terminology
1.1 Definition of aging
There are many possible definitions of aging.
We retain the proposed definition by the Nuclear Energy Agency and adopted by the Electric Power Research Institute (EPRI): the process by which the characteristics of a system, structure or component (SSC) gradually change with time or use.
In the rest of the text, we also use the terminology in the following box, taken from the same reference.
Failure analysis: systematic process for determining and documenting the mechanisms and surface and root causes of SSC failure.
Service conditions: actual conditions that have an impact on the SSC (normal conditions, operating transients, errors, accidental...
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Background and terminology
Identifying the aging process
Bibliography
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