Theory and application of the modular approach to NDT reliability

The objective of the modular approach for measuring the reliability of nond estructive testing (NDT) is to provide a validated testing system that fulf ills the requirements of the client in the most efficient and cost effectiv e manner. This capability is especially important where expensive statistic al tests are not possible. In developing this concept, a system is divided into appropriate submodules and the discrete reliability of each is tested. The knowledge gained within each of the modules allows an optimization of the total system. The reliability of the total system is then determined by joining the single reliabilities of the modules, including their possible correlation. To facilitate an understanding of the mechanics, the backgroun d of reliability analysis is briefly introduced. It is then considered how to properly characterize the reliability of an NDT component. Finally, a fi rst very simple attempt to join the modules is described.