On this day, 28 March 1979 Nuclear accident at Three Mile Island.
At 4 a.m. on March 28, 1979, the worst accident in the history of the U.S. nuclear power industry begins when
a pressure valve in the Unit-2 reactor at Three Mile Island fails to close. Cooling water, contaminated with
radiation, drained from the open valve into adjoining buildings, and the core began to dangerously overheat.
The Three Mile Island nuclear power plant was built in 1974 on a sandbar on Pennsylvania's Susquehanna River, just
10 miles downstream from the state capitol in Harrisburg. In 1978, a second state-of-the-art reactor began
operating on Three Mile Island, which was lauded for generating affordable and reliable energy in a time of energy crises.
After the cooling water began to drain out of the broken pressure valve on the morning of March 28, 1979, emergency
cooling pumps automatically went into operation. Left alone, these safety devices would have prevented the development
of a larger crisis. However, human operators in the control room misread confusing and contradictory readings and shut
off the emergency water system. The reactor was also shut down, but residual heat from the fission process was still
being released. By early morning, the core had heated to over 4,000 degrees, just 1,000 degrees short of meltdown.