Abstract
Abstract A very fast analytical computer program for fault tree evaluation has already been developed at the german nuclear research center of Karlsruhe. This program can solve coherent systems in binary logic. Four different classes of components can be handled by the program 1. 1. Unrepairable components 2. 2. Repairable components with failures which are immediately detected (revealed faults) 3. 3. Repairable components with failures which are detected upon demand (faults remain unrevealed until next demand occurs) 4. 4. Repairable components with failures which are detected upon inspection (faults remain unrevealed until next inspection is carried out). The program can perform also time dependent calculations. In particular the program can analyse systems characterized by two phases one following the other in time (two time axis). A numerical example is also included.
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