Modeling Alternative Inspection Protocols with Fault Tree on R
David Silkworth · 2023
The identification of latency is perhaps one of the most valuable contributions to safety and reliability engineering. Latent component events are characterized by hidden failures (or which represent conditions under which additional failures will combine to propagate system failure, or undesired events. Similar to exposure time the non-repairable model, latent events have exposure over an interval between inspections accompanied by any needed repair. The longer the interval, the higher the probability that a latent component will be in a failed state. Scheduling and even designing a system to permit inspection, proof or validation tests becomes key to risk reduction. In this presentation a small system exposing several opportunities for inspection of latent events will be modeled. utilizing the R environment, a series of inspection for each procedure is built in a matrix so that the fault tree be constructed multiple times in a programed loop accessing alternate protocols for inspection in each pass. A resulting table identifies the likely improvement in failure intensity for the undesired event depending on each inspection regime.