In the event of a nuclear accident, the Crisis Cell and its component parts the Radiological Evaluation Cell and the Communication and Information Cell assume management of the crisis.
- The Crisis Cell (Cellule de crise) heads the management of the crisis from start to finish. It is made up of the directors of several agencies involved in managing the consequences of an accident at a nuclear power station (the High Commissioner for National Protection, the National Health Directorate, the Rescue Services Agency, the Grand Ducal Police, the Armed Forces, etc.). In the event of an operational response on the ground, the Crisis Cell's mission extends to coordinating and monitoring the execution of all emergency measures. It can appoint an agency or department to coordinate operations on the ground. The Crisis Cell operates throughout the duration of the crisis until the situation returns to normal.
- The mission of the Radiological Evaluation Cell (Cellule d’évaluation radiologique), made up of experts in radiation protection and civil protection, is to monitor changes to the situation at the damaged reactor, the scale and evolution of the radiation in the environment and the impact of this on the population and to provide information to the Crisis Cell.
- The Communication and Information Cell (Cellule communication/information) is responsible for coordinating communication between the authorities and the population. It keeps the media and citizens informed of the changing situation as well as the preventive and protective measures decided by the Crisis Cell. The Communication and Information Cell is chaired by the Director of the Office for crisis communication.