Slide 152 of 161
Analyzing the Fault Tree
1. Determine the minimal cut-sets to simplify the tree (qualitative analysis).
2. Determine the probability of each input event
3. Combine the probability inputs to logic gates as follows:
a. AND Gate - The probability of output is the product of the probabilities of the inputs (P0=Pi1� Pi2...�Pin)
b. OR Gate - The probability of output is the sum of the probabilities of the inputs (P0=Pi1+ Pi2...�Pin)
4. Combine the gate input probabilities until the probability of the top event is determined.
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