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Top event
The events across the top of the event tree, which graphically represent the systems needed to keep the plant in a safe state following an initiating event (i.e., a challenge to plant operation). A top event is the starting point of the fault tree, which identifies all of the pathways that lead to a system failure. For additional information, see Probabilistic Risk Assessment.
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- Part of Speech: noun
- Synonym(s):
- Blossary:
- Industry/Domain: Energy
- Category: Nuclear energy
- Company: U.S. NRC
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