Reliability and Six Sigma
Containing a carefully developed integration of mathematical models that relate Six Sigma and reliability measures, this text is filled with case studies to illustrate the application of the models throughout.
TABLE OF CONTENTS Reliability and Six Sigma
5.5: Safety And Hazard Analysis
5.5 Safety And Hazard Analysis
In order to assure reliability in the design from safety perspective certain probability of risk should be evaluated before the launch of the product. The traditional reliability assessments discussed so far does not suffice this requirement. The reliability assured is based on the mission in question and the mission time of the product. The customer would like to make sure that the design has catered for all the safety requirements. Thus certain qualitative analyses of reliability tools are carried out which finally give certain quantifiable analysis such as probability of risk. Some of these tools are the Failure Mode Effects Criticality Analysis (FMECA), Fault Tree Analysis (FTA) and Safety Hazard Analysis (SHA). We describe these tools in detail in the following sections.
5.5.1 Fault tree analysis (FTA)
FTA was first developed by HA Watson of BELL Telephone laboratories in 1961-62 during Air Force study contract for the Minute man Launch Control system. The first published papers were presented at the safety symposium sponsored by the University of Washington and the Boeing Company. The Fault Tree Analysis also gained its importance from the nuclear industry following the Three Mile Island accidents in 1979. In 1981 US Nuclear Regulatory Commission (NRC) issued the Fault Tree Handbook NUREG-0492. FTA is extensively used where safety analysis is required and the systematic tree construction helps prevent oversights. Because of its logical, systematic and comprehensive approach it is capable of bringing out the design and operational weaknesses which might have escaped...
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