Maintenance models, system safety integration

This paper focuses on the difference between relevant maintenance scenarios in terms of system production. Another important aspect in many cases could be safety and environmental issues. This is more difficult to quantify than production but if it is applicable to the system of interest the optimal solution can not be found without taking it into account. If this is to be integrated into one large cost model, more input is necessary, namely the expected (discounted) cost of e.g. production loss, environmental spill and accidents of various severities. 

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