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Three Mile Island: key dates, numbers from its history

Posted 9/25/19

Where it’s been

• Began commercial operations in September 1974.

• Unit 1 was shut down and its license temporarily suspended following the March 1979 accident that permanently …

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Three Mile Island: key dates, numbers from its history

Posted

Where it’s been

• Began commercial operations in September 1974.

• Unit 1 was shut down and its license temporarily suspended following the March 1979 accident that permanently crippled the Unit 2 reactor. Unit 1 was allowed to resume operations in 1985, following approval from the Nuclear Regulatory Commission.

• Unit 1 since 2000 has produced 16,000 megawatts of carbon-free electricity, enough to power almost 800,000 homes a year.

• Unit 1 since 2000 has offset more than 95 million metric tons of carbon —- the equivalent of taking nearly 20 million cars off the road, according to information provided by Exelon. Unit 1 was producing 7.1 billion kilowatt-hours of energy per year.

• Before the Sept. 20 shutdown Unit 1 had gone 709 continuous days of “safe and reliable operations,” according to owner Exelon Generation.

• Three Mile Island including Unit 1 has provided close to a combined $1 million annually in local tax revenue to Lower Dauphin School District, Londonderry Township and Dauphin County.

• TMI had an annual payroll of $60 million. Since 2000 Unit 1 has contributed $6 million to local charitable organizations and non-profit groups, with TMI employees donating almost 40,000 volunteer hours.

Where it’s going

• The 675 full-time employees who were at TMI staffing Unit 1 is already down to 515.

• Full-time employment will be down to 300 shortly after Sept. 30, when used fuel from Unit 1 is to be moved into a spent fuel pool.

• Staffing will be down to 200 in 2021 and to about 50 in 2022, when used fuel is to be moved from the spent fuel  pool into dry cast storage.

• The cooling towers and other large components on Three Mile Island will not be taken down until 2074, under the current plan for decommissioning TMI that Exelon has submitted to the NRC.

(sources: Exelon Generation and Press & Journal archives)