Severe accidents in Sodium Fast Reactors: Safety Study Approach, Prevention and Mitigation by Design is a unique presentation of research work from the Sodium Fast Reactor Severe Accident team at CEA. Focusing on in-core and out-core severe accident phenomena, this book analyzes severe accident scenarios and mitigation, related calculations and tools, and key outcomes from important experimental programs. The book describes the state-of-the-art on severe accident research which will help to inform and direct further pre-conceptual Generation IV SFRs. Lessons learned from the pre-conceptual phase of the French ASTRID project are highlighted alongside different approaches to demonstrate robustness. To support the demonstration of concepts explored, a special section dedicated to calculation tools and their validation offers readers a unique set of tools to guide and inform their own research work. Readers will gain a deep understanding of methodologies to illustrate approaches as well as an overview of safety approaches from key countries based on the editor's rich international collaboration. Written by a group of experts from CEA Cadarache on the research of the Sodium Fast Reactor and Severe Accidents Project Focuses on the safety and mitigation of future sodium reactor severe accidents Includes methodologies for the safety evaluation of SFRs to inform future designs