Classification and management of nuclear leakage. (a) Nuclear leakage levels by The International Atomic Energy Agency (IAEA); (b) Nuclear leakage management, including emergency zones and regulatory agencies. The expanded forms of the abbreviations: LPZ, Longer term Protective Action Planning Zone; UPZ, Urgent Protective Action Planning Zone; PAZ, Precautionary Action Zone; C&EC, Control and Emergency Control; OAC, Off-site Assessment Center; RAC, Radiological Accident Commission; REC, Regional Emergency Commission; ECC, Emergency Control Center.