Copyright © Risknowlogy®. All rights reserved. v9
Summary - our essential questions and how to answer
them
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Does the SIF do what it should?
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Work up a summary SRS
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Check your proof test is fit for purpose against that SRS
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Does the SIF deliver the risk reduction it should?
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Another way of saying, check the PFD
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Historic data - no need to open the black box
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No historic data - open the black box and calculate (historic data or calculation)
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Are the assumptions you made in the HAZOP / LOPA still true?
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Are you avoiding new systematic errors?
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FSM by way of the safety plan
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Verification
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Functional Safety Audits and Assessments
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Effective monitoring and response
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