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The three mile island vaibhav

The Three Mile Island accident in 1979 was the most significant nuclear accident in U.S. history. It began with a minor malfunction that caused the reactor to shut down, but a relief valve failed to close. Over almost 16 hours, operators struggled to determine the problem and solution. Small amounts of radioactive gases were released, leading to the voluntary evacuation of 140,000 people within a 20-mile radius, though maximum radiation exposure was less than 100 mrem. The cleanup took 12 years and cost $973 million, and the plant did not restart until 1985. While no health effects were found, it highlighted needs for improved operator training and safety systems.

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Made by – Vaibhav Mangal & The Three Mile Island The Biggest Nuclear Accident in the U.S.
____________________________________________________________________________ _________ The Three Mile Island The Biggest Nuclear Accident in the U.S. _____________________________________ Made by – Vaibhav Mangal & Rohan Kashyap
Location  Three Mile Island Nuclear Generating Station, Londonderry Township, Pennsylvania, United States
INTRODUCTION  March 28, 1979 – 4 AM  Minor malfunction caused the second reactor to shut down almost immediately  A relief valve was supposed to close, but it did not, contrary to what the instrumentation showed
 The incident was rated a five on the seven-point International Nuclear Event Scale: Accident With Wider Consequences • Operators struggled to determine the problem and an appropriate solution • After almost 16 hours and the collaboration of 60 or more people, the situation was under control
Amount of contamination  Hydrogen & some radioactive gases were released into atmosphere. • A maximum of 13 million Curie of radioactive gas release • The maximun dosage to a person at the site boundary have been less than 100 millirem (mrem)
Voluntary evacuation  William Scranton III, the lieutenant governor the lieutenant governor, appeared at a news briefing to say that radioactivity releases  Schools were closed and residents were urged to stay indoors & farmers were told to keep their animals under cover and on stored feed
• The evacuation zonewas extended to a 20-mile radius on Friday, March 30 Within days, 140,000 people had left the area More than half of the 663,500 population within the 20-mile radius remained in that area
Cleanup • Around 12years to complete • Cost of cleanup estimated at $973
• Plant was not reopened until 1985
Health Effects  Government claimed no injuries or adverse health effects from accidents  Only one additional cancer death from radiation absorbed following the accident would result to those living within 50 miles of the plant.
Fallout from TMI
CURRENT STATUS • Viewed from the east, Three Mile Island currently uses only one nuclear generating station, TMI-1, which is on the right. TMI-2, to the left, has not been used since the
Recommendations  Use human factors principles to design the control panels  Better training program for operators  Better indicators for status of valves  Shift of plant priorities from continuing power production to safety
PRESENTED BY :- ROHAN KASHYA & VAIBHAV MANGAL