This paper analyzes the consequences of severe nuclear accidents that occurred at three major nuclear power plants: Three Mile Island (1979), Chernobyl (1986), and Fukushima (2011). The paper examines in detail various aspects of these accidents, their impacts on human health, the economy, and the environment, and the ways in which these consequences have shaped local communities and broader social dynamics. With particular attention to each of these disasters, the paper examines the number of fatalities, the loss of resources, and the long-term ecological impacts. The importance of safety measures, communication, and collaboration among all stakeholders will also be analyzed in order to apply lessons learned to future accidents. Through this review, the paper highlights key lessons learned from the mentioned nuclear accidents and highlights steps towards better preparedness and effective communication in case of future nuclear accidents.