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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
The three mile island vaibhav
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

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The three mile island vaibhav

  • 1. Made by – Vaibhav Mangal & The Three Mile Island The Biggest Nuclear Accident in the U.S.
  • 2. ____________________________________________________________________________ _________ The Three Mile Island The Biggest Nuclear Accident in the U.S. _____________________________________ Made by – Vaibhav Mangal & Rohan Kashyap
  • 4. Location  Three Mile Island Nuclear Generating Station, Londonderry Township, Pennsylvania, United States
  • 5. 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
  • 6.  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
  • 7. 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)
  • 8. 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
  • 9. • 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
  • 10. Cleanup • Around 12years to complete • Cost of cleanup estimated at $973
  • 11. • Plant was not reopened until 1985
  • 12. 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.
  • 14. 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
  • 15. 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
  • 16. PRESENTED BY :- ROHAN KASHYA & VAIBHAV MANGAL