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Real plant data
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Very large plant
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2 years of data
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A good example of good proof testing done well
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On “SHE” critical loops (mitigation and protection)
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87 failures
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34 dangerous detected, 55 dangerous undetected (until proof tested)
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Of the 55
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30 Random Hardware Failures
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11 Common Cause (Environmental) Failures
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10 Systematic
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