TMI Update: Jan 14, 2024

THREE MILE ISLAND NUCLEAR STATION, UNIT 1 - NRC SECURITY INSPECTION REPORT NO. 0500028912012403

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Comprehensive Testing Schedule Announced

LONDONDERRY TOWNSHIP, PA (Oct.2, 2012) – Exelon Generation has completed the installation of a new state-of-the-art siren system around Three Mile Island (TMI) Generating Station, part of a $13 million investment to upgrade sirens around the company’s nuclear stations.

The new system includes 96 sirens with improved sound coverage and battery back-up capability. This ensures the sirens will be able to operate and provide notification if electrical service is interrupted.

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REQUEST FOR WITHHOLDING INFORMATION FROM PUBLIC DISCLOSURE FOR SUSQUEHANNA STEAM ELECTRIC STATION (TAC NOS. ME9083 AND ME9084)

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SRBC is currently reviewing both surface water and consumptive use applications for BBNPP. Based on our review of PPL’s consumptive use mitigation needs, SRBC staff has determined that it cannot recommend approval of operations at Holtwood, as proposed, to meet the mitigation requirement at BBNPP. Holtwood’s downstream location would leave approximately 120 river miles unmitigated during designated low flow periods. This does not preclude using operations at Holtwood as potential mitigation for other, more appropriate PPL assets.

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Susquehanna Steam Electric Station, Units 1 and 2
October 16, 2012
5:00 p.m. to 7:00 p.m. - Meeting

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The NRC began examining flooding issues, in the form of upstream dam failures, prior to the Fukushima Dai-ichi accident. That work was incorporated into the agency’s post-Fukushima efforts, which include requiring all U.S. plants to re-analyze potential flooding hazards at their sites using the latest available information. The plants will use present day guidance and analysis methods that have been used in new reactor applications to analyze hazards including stream and river flooding, hurricane storm surges, tsunami, and dam failures. In May, the NRC announced a schedule for all U.S. nuclear power plants to complete the hazard re-analysis by March of 2015.

If the re-analyzed flood hazards exceed the levels a plant was originally designed for, the plant will tell the NRC what interim measures it will use to safely deal with the new hazard. The plant will also perform an “integrated assessment” to identify specific vulnerabilities and examine how existing or planned systems or procedures will prevent or mitigate flood damage.

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STATUS OF THE ENVIRONMENTAL REVIEW FOR THE BELL BEND NUCLEAR POWER PLANT COMBINED LICENSE APPLICATION

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LONDONDERRY TOWNSHIP, PA (Sept. 22, 2012) – Three Mile Island Unit 1 returned to service today at 9:12 a.m. EDT when operators connected the plant’s turbine generator to the regional power grid. The unit automatically shut down on Sept. 20 due to an unexpected actuation of a relay switch on a reactor coolant pump. Plant personnel replaced the relay, installed additional monitoring capabilities of the relay and tested the pump prior to restarting the plant.

“We performed the necessary repairs safely and efficiently and are committed to a reliable operating cycle,” said Rick Libra, TMI Site Vice President.

Three Mile Island is located about 12 miles south of Harrisburg, Pa. The plant generates 852 megawatts of carbon free power - enough electricity for about 800,000 homes. Electric customers were not affected by the plant being off-line.

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