This book - the culmination of a truly collaborative international and highly interdisciplinary effort - brings together Japanese and American political scientists, nuclear engineers, historians, and physicists to examine the Fukushima accident from a new and broad perspective. It explains the complex interactions between nuclear safety risks (the causes and consequences of accidents) and nuclear security risks (the causes and consequences of sabotage or terrorist attacks), exposing the possible vulnerabilities all countries may have if they fail to learn from this accident.