TMI had zero fatalities, minimal release of radiation, and no measurable effect on health. Residents of the area were exposed to less radiation from the accident than the yearly background dose.
Some layers of safety failed, but the rest did their job. That’s why we call it an accident and not a disaster. The plant continued to operate for decades with no issues. The only reason it’s so prevalent in the public consciousness is because of faulty reporting and irresponsible, ignorant people (like you) parroting the first thing they hear from sensationalist media.