The failure event is a short description of the problem that you and your team are analyzing. Your team could be analyzing a failure event that comprises several failures over a specified period of time, or one failure (e.g., a larger event, such as a fire). The first time that you access the Event Diagram workspace or the Logic Tree workspace for a given RCA, you will be prompted to define the failure event in an RCA Event, which will be used as the Failure Event node. The following image shows an example of a completed RCA Event.
Each RCA will have one Failure Event node, which will always appear at the root level of the Logic Tree hierarchy and as the first node in the Event Diagram. For example, the following image shows the Failure Event node as it appears in the Logic Tree in our Cooling Water Pump example.
You cannot remove the Failure Event node from the Logic Tree or the Event Diagram. You can, however, modify the RCA Event, as needed.
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