Do primary event uncertainty distributions impact top event distribution?

The risk analysis is an essential element of planning, production and operation of technical equipment. This paper deals with the fault tree. The fault tree analysis belongs to the most commonly used risk assessment methods. The main aim of the paper is to ask for the question: does the top event uncertainty assessment have a relationship with adopted assumption of primary events distribution?To achieve this aim a computer simulation that involve random numbers, commonly known as the Monte Carlo method, was used. The research makes use of the Beta, Lognormal, Johnson SJ and truncated Normal distribution.