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concerned primarily with failures and failure rate

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Unformatted text preview: onditions.) Concerned primarily with failures and failure rate reduction Parallel redundancy Standby sparing Safety factors and margins Derating Screening Timed replacements % !             c          !              c        Reliability Engineering Approach to Safety (2) Assumes accidents are the result of component failure. Techniques exist to increase component reliability Failure rates in hardware are quantifiable. Omits important factors in accidents. May even decrease safety. Many accidents occur without any component ‘‘failure’’ e.g. Accidents may be caused by equipment operation outside parameters and time limits upon which reliability analyses are based. Or may be caused by interactions of components all operating according to specification Highly reliable components are not necessarily safe. Software−Related Accidents Are usually caused by flawed requirements Incomplete or wrong assumptions about operation of controlled system or required ope...
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