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Quantitative risk assessment system (QRAS)

  • US 6,223,143 B1
  • Filed: 08/31/1998
  • Issued: 04/24/2001
  • Est. Priority Date: 08/31/1998
  • Status: Expired due to Fees
First Claim
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1. An apparatus assessing risk of failure of a system, said apparatus comprising:

  • a build risk model module building a risk model of the system, said risk model including an element/subsystem/failure mode hierarchy, a mission timeline linked with the hierarchy by indicating what are phases for global system functioning and providing time intervals for failure modes for each subsystem, mulitiplicities, redundancies, and dependencies across the system and at a subsystem level and above by an embedded fault tree behind the hierarchy, a failure mode quantification, event sequence diagrams that link with initiating events of the event sequence diagrams being the failure modes in the hierarchy, tagged by Phase and operational time intervals of the respective subsystems;

    a create fixed baseline/generate analysis runs module, coupled to the build risk model module, creating a fixed baseline of the system that generates and stores the lowest-level scenarios of the risk model preserved in event-tree structure, with linkage via the hierarchy to time-based or demand-based quantification, and providing for multiple user-defined analysis runs using the fixed baseline; and

    a perform sensitivity analysis module, coupled to the create fixed baseline/generate analysis runs module, altering any of the components or combination thereof that are fundamental to construct the baseline without modifying the baseline itself, and using an existing analysis run, generating the sensitivity run with the user-supplied sensitivity changes, presenting both the original runs and the new sensitivity-derived results.

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