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| Fault trees are constructed to
understand how a chain of events can lead to an undesired outcome.
A fault tree is constructed with the outcome (an incident, accident or release scenario) as the top event in the tree.
The tree is comprised of basic events, sub-events and logic gates that bind the components together and determine the top event failure rate.
These tree components are depicted in the following symbol table:
Fault Tree Properties;
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they breakdown an event into its contributing causes
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the tree is a combination of failures and sub-events that are sufficiently
defined to yield the top event
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a cut set is a set of primary events or unrealized events
which can give rise to the top event
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a minimum cut set does not contain another cut set
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the complete set of minimum cut sets represents the principal fault modes that produce the top event
Fault Tree Example: Vessel grounding event
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