This report aims to identify and detail typical worst case scenarios that can occur on hydrogen applications. For each FCH installation, feedbacks and lessons learned, hazardous phenomena, detailed scenarios using fault/event tree analysis accounting for positives or negative impact of the tactic conducted by the First Responders is considered. To assess the consequences of each scenario, typical leak size, storage pressure, hydrogen inventory are selected for each FCH application. Contemporary CFD and/or engineering tools have been used to assess the potential consequences of the hazardous phenomena. The content of this deliverable will be integrated into educational materials that will be available online through educational activities and will serve to the development of the scenarios used for operational and Virtual Reality trainings.