failure of a safety system which tends to impede a given safety action
Note 1 to entry: This is a systemic failure in relationship with a given safety action performed by the safety
system. Therefore this concept is irrelevant for an individual item on the shelves.
Note 2 to entry: See Figure B.1.
Source: ISO/TR 12489:2013(E) Reliability modelling and calculation of safety systems. Global Standards