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The development of mixed-criticality systems that integrate applications of different criticality levels (safety, security, real-time and non-real time) in a single embedded system can provide multiple benefits such as product cost-size-weight reduction, reliability increase and scalability. However, the integration of applications of different levels of criticality in a single embedded system leads to several challenges with respect to safety certification standards. This research paper describes a safety concept for a fail-safe wind turbine mixed-criticality control system based on multicore partitioning that meets IEC-61508 and ISO-13849 industrial safety standards. The safety concept has been positively assessed by a certification body.