Some epidemiological studies analyzing the rate of cancer in and around the area since the accident did not determine that there was a statistically significant increase in its rate, while others did. The partial meltdown resulted in the release of radioactive gases and radioactive iodine into the environment.ДЄnti-nuclear movement activists expressed worries about regional health effects from the accident. It has been cited as a contributor to the decline of a new reactor construction program, a slowdown that was already underway in the 1970s. The accident crystallized anti-nuclear safety concerns among activists and the general public, and resulted in new regulations for the nuclear industry.

During the event these inadequacies were compounded by design flaws, including inconveniently arranged instruments and controls, the use of multiple similar alarms, and a failure of the equipment to clearly indicate coolant inventory level or the position of the stuck-open PORV. TMI training and procedures left operators and management ill-prepared for the deteriorating situation. The mechanical failures were compounded by the initial failure of plant operators to recognize the situation as a loss-of-coolant accident (LOCA). The accident began with failures in the non-nuclear secondary system followed by a stuck-open pilot-operated relief valve (PORV) in the primary system that allowed large amounts of nuclear reactor coolant to escape. On the seven-point International Nuclear Event Scale, it is rated Level 5 - Accident with Wider Consequences.

It is the most significant accident in U.S. The Three Mile Island accident was a partial meltdown of the Three Mile Island, Unit 2 (TMI-2) reactor in Pennsylvania, United States.

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