Failure 12
Failure 12 : Inability of a structure, system or component to function within acceptance criteria. Note that the structure, system, or component is considered to fail when it becomes incapable of functioning, whether or not it is needed at that time. A failure in, for example, a backup system may not be manifest until the system is called upon to function, either during testing or on failure of the system it is backing up. Common Cause Failure: Failure of two or more structures, systems or components due to a single specific event or cause. For example, a design deficiency, a manufacturing deficiency, operation and maintenance errors, a natural phenomenon, a human induced event, saturation of signals, or an unintended cascading effect from any other operation or failure within the plant or from a change in ambient conditions. Common Mode Failure: Failure of two or more structures, systems or components in the same manner or mode due to a single event or cause. i.e. common mode failure isa type of common cause failure in which the structures, systems, or components fail in the same way. Failure Mode: The manner or state in which a structure, system or component fails
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