iSixSigma

FMEA question

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  • #255170

    dkrupa
    Participant

    The FMEA example on this site involves a flat tire. With the proposed corrective action (i.e., carry a spare tire), the SEV is reduces, but the OCC and DET remain the same. That’s the way I always understood it.
    Recently, I’ve seen examples where the proposed corrective action also shows a reduction in the OCC and DET.
    My question: Is that correct, or does the proposed corrective action only affect/reduce the SEV?

    To expand, I’m looking at a case study for the Fukushima Daichi disaster, where the tsunami breached the sea wall, flooded the generators, and caused the meltdown. The Tsunami would happen no matter what corrective actions I may put into effect (OCC and DET), so by taking other safety measures (say, placing back-up generators on high ground), only the SEV is reduced.

    Thanks for any insight.

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    #255210

    Strayer
    Participant

    Risk remediation often concerns reducing severity, but it can also involve occurrence or detection, or all three. In the flat tire example, carrying a spare affects SEV but does nothing about OCC or DET. There are other potential corrective actions. Using run-flat or puncture-resistant tires would reduce OCC. So would replacing tires due to age or wear, or using tires warranted to last longer. Tire pressure sensors used on many vehicles improve DET before the tire actually goes flat. If you’re doing a thorough FMEA you’d want to include each of these and see which one gives the better RPN. The optimum risk reduction might include two or more. An FMEA isn’t suited for multi-variate analysis so it’s an iterative process.

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    #255254

    dkrupa
    Participant

    Thanks

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