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One of the important tasks of the Reliability Estimation is Analysis of theFault Tree. A problem of Fault Trees analysis is considered one of the mostcomplex ones, since structure of such trees is characterized by a considerablenumber of interconnections. Usually analytical methods are used and mostapplicable method is Minimal Cut Sets building and calculation. Classical FaultTree Analysis methods are applicable only for Fault Trees without loops. Loopscan appear in Fault Tree, when a TOP or some intermediate gates appear as inputto another gate at a lower level of the model. An occurrence of a Loop has beena problematic issue in a Fault Tree calculation. The article relates to theuniqueness of the solution for the Fault Trees with arbitrary Loops. There areassumed, that failures of the Basic Events are non-repairable and Fault Treegates may be expressed by two main logic gates.

Analytic Methods to Calculate Fault Trees with Loops - Restrictions of Application and Solution Uniqueness