EN50126 PDF

Quantitative Risk Analysis In some situations the qualitative risk analysis or the ALARP principle is insufficient: The safety people are torn and disagrees internally. Consequently, it is time to use the heavier "quantitative risk analysis"-tool. The fault tree is integrated into Excel and models a scenario, where a passenger is trapped between closing doors. All numbers and technical barriers are hypothetical. Interpretation The quantitative risk analysis is the right way to estimate the frequency of a hazard.

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Quantitative Risk Analysis In some situations the qualitative risk analysis or the ALARP principle is insufficient: The safety people are torn and disagrees internally. Consequently, it is time to use the heavier "quantitative risk analysis"-tool.

The fault tree is integrated into Excel and models a scenario, where a passenger is trapped between closing doors. All numbers and technical barriers are hypothetical. Interpretation The quantitative risk analysis is the right way to estimate the frequency of a hazard.

It removes personal obsessions from a safety problem and ensures that the discussions are conducted on an objective basis. The fault tree above concerns a commuter fleet operating days pr. In order to have an accident, there have to be squeezed a passenger arm, leg or items like e. There are three barriers that prevent the hazard: A human based departure procedure, where the train driver looks out of the window and checks the doors before departure e.

There are also two technical functions: - A traction blocking that prevents the train from driving if the door controllers indicate the doors are open f. This function is part of the train computer and is expected to be reliable with a failure rate of 1 failure pr. As it can be seen we will end up having an accident where the train departs with a passenger trapped between doors every year.

Can we accept this? What are our quantitative acceptance criterion? It should be written and stated in the safety management system of the Operator. The safety management now decides that the above result is unacceptable.

These mitigating actions result in a dramatically lowering of the frequency of the hazard to app. As a side effect, the analysis proves the importance of the departure procedure and the detection function.

The fault trees easily swell up into large trees with several undocumented values based on engineering judgement. This only starts new discussions instead. Chapter 5. A risk model may be created for a specific task e.

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