730-731 / 1145
© ABB Group
November 3, 2016 | Slide 3
Why do FSA’s?
More than 60% of
failures are built
into the
safety-related systems before taken into
service
A large proportion of these are part of
those called
systematic failures
(rather
than random hardware failures)
.
Apart from being a requirement of the
standard, FSA’s help to ensure that
systematic failures are not introduced
into
the safety related system.
Implementing FSA’s contributes to achieve,
verify and demonstrate the claimed
systematic capability of a safety related
system
44%
Specification
20%
Changes after
commissioning
15%
Operation &
maintenance
6%
Installation &
commissioning
15%
Design &
implementation
Source: HSE Publication – Out of Control