Three mile island (nuclear accident)

Three mile Island(nuclear accident)

Mar 28, 1979

The accident began at 4 a.m. on Wednesday, March 28, 1979, with failures in the non-nuclear secondary system, followed by a stuck-open pilot-operated relief valve (PORV) in the primary system, which allowed large amounts of nuclear reactor coolant to escape.

Emergency declared

Mar 28, 1979

At 6:56 am, a plant supervisor declared a site emergency, and less than 30 minutes later station manager Gary Miller announced a general emergency, defined as having the "potential for serious radiological consequences" to the general public.[

Cleanup

Mar 28, 1979

A clean-up crew working to remove radiation at Three Mile Island.Three Mile Island Unit 2 was too badly damaged and contaminated to resume operations; the reactor was gradually deactivated and permanently closed. TMI-2 had been online only 13 months but now had a ruined reactor vessel and a containment building that was unsafe to walk in. Cleanup started in August 1979 and officially ended in December 1993, with a total cleanup cost of about $1 billion.

three mile island ( nuclear accident)

Mar 28, 1979

The Three Mile Island accident was a core meltdown in Unit 2 (a pressurized water reactor manufactured by Babcock & Wilcox) of the Three Mile Island Nuclear Generating Station in Dauphin County, Pennsylvania near Harrisburg, United States in 1979.
The power plant was owned and operated by General Public Utilities and Metropolitan Edison (Met Ed). It was the most significant accident in the history of the USA commercial nuclear power generating industry, resulting in the release of approximately