This paper reviews the current status and procedures associated with damage function analysis as it applies to the development, design, and operation of nuclear reactors. Damage function analysis provides a systematic applied engineering approach for estimating fluence limits and their uncertainties for neutron-induced property changes for reactor materials and components. A summary of derived, quasi-empirical damage functions is provided and emphasis is placed on the need for standardization in their definition and application. Included is a discussion of the calculation and use of displacement production as an energy-dependent measure of exposure and displacement cross sections for damage function analysis. A brief review is given of the current and projected status of the neutron flux-fluence spectra characterisation that is essential for damage function analysis.
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