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Uses of Risk Analysis to Achieve Balanced Safety in Building Design and Operations (1991) / Chapter Skim
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Appendix C: Illustrative Risk Analysis Procedures
Pages 57-62

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From page 57...
... The PHA uses an inductive forward analysis of starting with the failure event and identifying sequential consequences resulting from the failure. A PHA is an initial effort to identify potential problem areas and the system components and their interfaces.
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From page 59...
... A FMEA normally deals with equipment and does not include the human action interface, system interaction, and common cause failures. The documentation of failure modes and conditions that lead to the failure enables the designer to focus on details of enhancing reliability and performance in a systematic manner.
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From page 61...
... Systems often degrade without experiencing sudden failure, but detailed analyses of such failure modes introduce considerable complexity into the event trees. Statistical correlations among events may affect the sequence probabilities and are difficult to evaluate with currently available data.
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From page 62...
... Procedures for constructing fault trees are well documented and provide a means by which complex interrelationships can be understood. Construction of a fault tree requires an intimate knowledge of the system being studied, identifying causes, determining exclusiveness, independence, and conditionality of events, and logically describing event interactions require considerable thought and understanding.
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Key Terms

  • fault trees
  • event tree
  • fault tree
  • effects analysis
  • forward analysis

  • hazard analysis
  • preliminary hazard
  • event trees
  • causal relationships
  • cause failures

  • criticality analysis
  • common cause
  • failure event
  • tree analysis
  • cause failure

  • detailed analyses
  • identifying sequential
  • describes potential
  • diagrams share
  • related operational

  • qualitative study
  • describing event
  • construct event
  • consequences resulting
  • inductive analysis

  • intimate knowledge
  • tree starts
  • potential losses
  • statistical correlations
  • governmental action


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