OH Nuke Back Online
Monday, September 26, 2016 @ 02:09 PM gHale
Davis-Besse Nuclear Power Station returned to service Thursday after a rainwater leak forced the plant to shut down Sept. 10.
The plant went back in service at 10:27 a.m. Thursday, said FirstEnergy spokeswoman Jennifer Young.
Young said that during a heavy rain storm, water leaked through the Carroll Township, OH, plant’s turbine building roof vents into a breaker box and affected electrical components in the building.
Plant workers normally open the roof vents during hot weather to keep the turbine building cool, Young said.
She said the turbine building is separate from Davis-Besse’s nuclear reactor.
When the Sept. 10 storm came through Ottawa County, workers tried to close the roof vents but one would close only partially.
“They closed it to the best of their ability,” Young said.
The roof vent had been fixed during the plant’s time offline, with all of the turbine building’s electrical components checked during a restart process, Young said.
A Nuclear Regulatory Commission (NRC) filing from Sept. 13 confirmed the power station, located near Cleveland, automatically shut down because of an electrical issue with the main generator.
In addition to the water leak, the NRC filing said the main generator ends up used by the plant to generate electricity using steam from the nuclear reactor. If an unexpected problem occurs affecting the operation of the main generator, then the reactor’s design calls for it to automatically shut down to prevent damage to plant components.
During the shutdown, there also was an unexpected issue with one of the two steam generators, according to the NRC.
The agency said the steam generators use hot water from the reactor to generate electricity. Plant operators responded to this issue and maintained steam generator levels within the normal range, according to the filing.
The incident ended up listed as a non-emergency by the NRC in its preliminary report.