Systems safety analysis is a systematic process of identifying hazardous conditions existing in a system. The two principal methods of safety analysis are inductive and deductive analysis. Inductive techniques include preliminary hazards analysis, failue modes and effects and criticality analysis, fault hazards analysis, decision trees, and Markovian processes. They are best applied to generic equipment hazards. On the other hand, the development of subsystem functional faults requires deductive analysis, specifically fault tree analysis. The fault tree is a graphic and logical representation of the various combinations of possible events, both fault and normal, occurring in a system. These events are represented by the appropriate symbols that can be used as inputs and/or outputs of the standard AND and OR gates or other special gates. The fault tree is built by construction rules that establish the procedures necessary at each gate to determine the type of gate to use and the inputs to the gate. Fault tree evaluation can be both qualitative and quantitative. The safety program is the culmination of all the analysis techniques and insures that an adequate level of safety is achieved in the final design of the system. /Author/

  • Supplemental Notes:
    • Sponsored by the Atomic Energy Commission.
  • Corporate Authors:

    University of California, Livermore

    Lawrence Livermore National Laboratory
    Livermore, CA  United States  94550
  • Publication Date: 1973-5

Media Info

  • Features: Figures; References;
  • Pagination: 74 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00132136
  • Record Type: Publication
  • Source Agency: National Safety Council Safety Research Info Serv
  • Report/Paper Numbers: Report No. UCID-16238
  • Contract Numbers: W-7405eng-48
  • Files: TRIS
  • Created Date: Oct 29 1977 12:00AM