This paper illustrates how nuclear crisis are managed in France. It proposes IT solutions dedicated to event management that could help to resolve such a crisis by facilitating coordination between actors and increasing situational awareness. This study has been conducted as part of the European project PLAY. Requirements have been collected from different stakeholders through reviews of the literature, internal reports and websites, and interviews. Our proposal consists in the construction of a simulation tool to validate the complex-event processing architecture and the associated platform. The aim is to show the potential added value from the PLAY platform in the context of the response to a nuclear crisis.