The course is based on generic case study to address crisis decision management. The scenario considers an attack on an NPP requesting an emergency response at national level and provides successive failures of safety functions requiring timely and appropriate measures to be taken to stop the aggression and restore safety and security on the site. The course is a scenario driven with time-stepped facilitated discussion. The module consists of three days of training. The scenario is divided into four phases and nine sequences, each addressing a homogeneous stage of the emergency situation: ▪ Reflex phase: – First sequence: the attack, ▪ Reflection phase: – Second sequence: first statement/first response, – Third sequence: emergency management deployment, – Fourth sequence: failure of first actions, – Five sequence: analysis of the situation, – Sixth sequence: intervention strategy, – Seventh sequence: decision-making process for assault, ▪ Response phase: – Eighth sequence: assault by SWAT, ▪ Recovery phase: – Ninth sequence: recovery strategy.