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Risk of Vessel Accidents and Spills in the Aleutian Islands Designing a Comprehensive Risk Assessment - Special Report 293 (2009) / Chapter Skim
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F Event Sequence Diagram Method and Risk ScenarioDevelopment
Pages 199-202

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From page 199...
... These scenarios provide the context within which the events and their causes are evaluated as potential hazards or sources of risk. In event sequence diagramming, a set of graphical symbols is used to describe the various elements of a scenario.
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From page 200...
... An event sequence diagram, therefore, is a visual representation of a set of possible risk scenarios originating from an initiating event. Each scenario consists of a unique sequence of occurrences and nonoccurrences of pivotal events (Point B or C in Figure F-1)
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From page 201...
... Historically, event sequence diagramming has been loosely defined and has been used in a variety of industries for different purposes. It has been used in probabilistic risk analyses by the nuclear power industry to develop and document the basis for risk scenarios, as well as to communicate risk assessment results and models to designers, operators, analysts, and regulators.
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From page 202...
... Developing scenarios that can be analyzed efficiently requires good engineering knowledge, extensive experience in systems operation, and familiarity with modeling. Figure F-4 characterizes the main aspects of marine scenarios.
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Key Terms

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  • risk scenarios
  • initiating event
  • diagram method
  • simple event

  • pivotal event
  • sequence diagrams
  • failed state
  • human action
  • risk scenario

  • sequence diagramming
  • pivotal events
  • event occurs
  • unique sequence
  • operating zone

  • power industry
  • reliability analyses
  • scenario consists
  • determine probabilities
  • various elements

  • identify accident
  • diamond symbol
  • output lines
  • diagram concept
  • extremely versatile

  • scenarios originating
  • risk analyses
  • yes output
  • communicate risk
  • graphical symbols


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