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The Fail-Safe Feature of the Lapp & Powers Fault Tree

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1 Author(s)
Locks, Mitchell O. ; Dept. of Administrative Sciences; Oklahoma State University; Stillwater, Oklahoma 74074 USA.

In response to the Editor's suggestion, 3 states of the Lapp & Powers fault-tree model are distinguished, `good', `failed safe' and `failed unsafe'. Both the logical and the probability functions are given separately for both failed safe and good events as well as the probability calculations. A simplified 2-component example is also discussed to illustrate the relationship between XOR gates in fault trees and fail-safe systems and subsystems.

Published in:

Reliability, IEEE Transactions on  (Volume:R-29 ,  Issue: 1 )