The Chernobyl accident: causes, consequences, and lessons learned – an analytical review

The Chernobyl accident, which occurred in 1986 in Ukraine, remains the most severe nuclear disaster in history, both in terms of the magnitude of radioactive release and its transnational impacts. This article analyzes the technical and operational causes, the physical, nuclear dynamics of the explosions, and the immediate and long-term consequences for human health, the environment, and international governance. The vulnerabilities of the Chernobyl reactor, procedural failures, radionuclide dispersion, and emergency measures, including the construction of the New Safe Confinement, are discussed. Delayed effects are also examined, such as the increased incidence of thyroid cancer, persistent contamination by cesium-137, and psychosocial impacts. Finally, the study synthesizes lessons for reactor design, operation, emergency response, and risk communication, highlighting implications for nuclear safety and the global energy transition.