CyberCertPrepOT Security FundamentalsOT Fundamentals: Safety Systems & Physical SecurityEASYFree question
A function has an average probability of failure on demand of 0.001. What risk reduction factor does that value give?
- A.A reduction factor of 1000
- B.A reduction factor of 100
- C.A reduction factor of 10000
- D.A reduction factor of 0.001
Why A is correct
The risk reduction factor is the inverse of the PFDavg so 0.001 gives 1000. That sits at the bottom of the SIL 3 RRF band. A value of 100 would correspond to PFD 0.01 and 10000 to PFD 0.0001.
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