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In 1978, the plant was closed for nine months while modifications were made to improve its resistance to earthquakes. The Trojan steam generators began having problems four years before anyone noticed premature cracking of the steam tubes.
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In the 1980 Oregon election, a ballot measure to ban construction of further nuclear power plants in the state without federally approved waste facilities was approved by the voters
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In 1986 35% of Oregon residents voted yes to close Trojan and 64% voted no.
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Oregon residents voted two more times to keep Trojan Power Plant opperating.
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In 1992 Portland General Electric spent $4.5 million to defeat ballot measures seeking to close Trojan.
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January 1993 chief plant engineer David Fancher, acting as spokesman for PGE, announced the company would not try to restart Trojan.
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In 2005 the reactor and other radioactive equipment were removed from Trojan and transported along the Columbia to Hanford Nuclear Reservation in Washington. It was buried in a 45-foot-deep pit, making it the first reactor to be moved and buried whole.
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The iconic cooling tower was demolished by a dynamite implosion on May 21, 2006. It was the first implosion of a cooling tower at a nuclear plant in the United States.
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Demolition work was continued on the 3 remaining structures on the Trojan site through 2008. Nuclear waste is still present on the Trojan site and it is expected that finishing demolition of the plant will cost approximately Oregon tax payers $230,000,000.