Three Mile Island Unit 1 goes off line due to turbine generator shutdown

By Dorothy Davis

Three Mile Island (TMI) Unit 1 went off line late Sunday night when a faulty electrical card caused the plant’s turbine generator to shutdown resulting in a release of steam that may have been audible to area residents.

The shutdown occurred Sunday at 11:25 p.m. EST; but according to a release from TMI owner and operator Exelon, the plant responded as expected, and neither the turbine shutdown nor the subsequent steam release posed a threat to the public.

Plant officials have since reported that the defective electrical card has been replaced and the plant’s turbine generator reconnected to the regional power grid to commence operations around 10:50 p.m. Monday. Electric customers were not affected by the shutdown.

As of this morning the Nuclear Regulatory Commission’s (NRC) daily reactor status report listed Three Mile Island 1 operating at 68 percent. Reactor status data is collected by NRC between 4 a.m. and 8 a.m. EST daily.

Three Mile Island Unit 1 is a pressurized water reactor designed by Babcock and Wilcox that generates 852-megawatts of electricity, enough to power approximately 800,000 homes.

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