A fault event representing a component failure or
human error that requires no further development.
A basic event is the lowest level of resolution in
a fault tree.
A fault event representing a failure or error which
is not examined further because information is not
available or because further development is
beyond the scope of the study.
A fault event representing a condition or event
that is assumed to exist either as a boundary
condition for the fault tree or because the event
always occurs unless a failure takes place.
The TRANSFER IN symbol indicates that the
fault tree is developed further at a corresponding
TRANSFER OUT symbol. Transfer symbols are
used to transfer off-page or to avoid repeating
identical logic (with identical events) in several
places in a fault tree.
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