Three
Mile Island: The Inside Story
Five Score Years of Nuclear Power
1896: Radioactivity of uranium discovered
1902: Recognition that radioactive atoms contain huge amounts of
energy, far greater than that extracted through chemical reactions
1905: Einstein’s theory of relativity provides basis (E=mc²)
for inference that all atoms contain such vast quantities of energy
1912: Nuclear structure of atoms discovered and atomic nucleus
recognized as site of radioactivity and atomic energy
1932: Neutron discovered; recognition that nuclei are composed
of neutrons and protons
1939: Fissioning of uranium nuclei by neutrons discovered; release
thereby of large quantity of atomic energy observed
1942-45: World War II Manhattan Project builds first operating
nuclear reactors—not to produce energy but to convert uranium
atoms into the plutonium used in first and third atomic bombs (Alamogordo,
Nagasaki)
1954: Nautilus, first nuclear powered submarine, launched—the
first major application of nuclear reactors to power generation
1957: First civilian nuclear reactor for power (electricity) generation
goes into operation at Shippingport in western Pennsylvania
1968: Construction begins on TMI-1, first nuclear power plant on
Three Mile Island in the Susquehanna River below Harrisburg, Pa.
1969: Construction begins on second
nuclear power plant on Three Mile Island, TMI-2
1974: Three Mile Island Unit 1 (TMI-1) begins operation
1978: Construction permit issued to Shearon Harris in North Carolina,
the last U.S. commercial nuclear power plant licensed to begin construction
1978 April: TMI-2 begins operation
1979 March/April: The accident at
TMI-2
1980 July: First entry into TMI-2
containment building
1981: Cleanup of TMI-2 begins with
extraction of radioactivity from the hundreds of thousands of gallons
of retained cooling water
1982 July: First TV inspection of
interior of TMI-2 reactor vessel
1983 August: ‘Sonar’ mapping
of interior of TMI-2 reactor vessel
1985: Removal of wreckage from TMI-2
reactor vessel and shipment to Idaho begins
1985 October: TMI Unit 1 permitted to return to service after many
delays and despite many protests, one of about 100 commercial nuclear
power plants presently operating in the United States
1986 April: Chernobyl nuclear power plant disaster in Ukraine (Eastern
Europe) releases massive quantities
of radioactive material
1987: Recognition that about half
the fuel in TMI-2 reactor had melted
1989: Recognition that molten fuel
had poured into bottom of reactor vessel
1993: TMI-2 reactor placed in Post-Defueling
Monitored Storage
1996: Last commercial
nuclear power plant to be completed in the U.S. begins operation
at Watts Bar, Tenn.
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