At Three Mile Island's Unit 2 nuclear reactor, located just outside Harrisburg, Pennsylvania, a significant incident unfolded due to a coolant leak that occurred on March 28, 1979. The trouble began in the early hours of the morning when a cooling system malfunction caused a loss of coolant, leading to the reactor core overheating. The complex interplay of mechanical failures and human errors resulted in the reactor becoming unstable, prompting operators to initiate emergency procedures. Key equipment, including the reactor’s valves, failed to function as intended due to the unexpected circumstances. As the core temperature rose, a partial meltdown ensued, which alarmingly released a small quantity of radioactive gases into the environment.Despite the serious nature of the event, the immediate response efforts successfully stabilized the situation, averting catastrophic outcomes. Emergency measures included manual activation of cooling systems, which ultimately prevented further escalation of the crisis. However, the incident sparked intense scrutiny of nuclear safety regulations across the United States. In the aftermath, there was a pronounced public outcry, leading to an increased demand for regulatory review of nuclear energy plant standards, response preparedness, and operator training. While no one was injured, the psychological impact and public perception regarding the nuclear energy industry would change dramatically, initiating debates about the viability of nuclear power as an energy source.