The international radiological protection community performed a major status review of the situation around the damaged Chernobyl reactor on the 10-year anniversary of the accident. Since then, studies of the accident site and the contaminated territories continue to be undertaken, which have yielded new scientific results and highlighted important social and health aspects. This report is a complete update of the NEA's earlier publication, Chernobyl: Ten Years On. In particular, it offers the reader the most recent informatin on the significant new experience gained in the areas of emergency management, long-term environmental behaviour of radioactive materials and health effects.