Bloomberg News

Exelon’s Byron 2 Reactor in Illinois Shuts Down, NRC Says

January 31, 2012

(Updates with comment from company spokeswoman in last paragraph.)

Jan. 30 (Bloomberg) -- Exelon Corp. shut the Byron 2 reactor in Illinois after losing offsite power, a spokeswoman for the Nuclear Regulatory Commission said.

“There were reports of smoke around the transformer, but they found there was no fire,” Victoria Mitlyng, an agency spokeswoman based in Chicago, said in a telephone interview.

Exelon, the largest U.S. utility holding company, declared an unusual event, the lowest of four emergency categories, at 10:18 a.m. The 1,136-megawatt reactor is 85 miles (137 kilometers) west of Chicago, where Exelon is based. Another unit at the site, the 1,164-megawatt Byron 1, is operating at full capacity.

The cause of the power failure hasn’t been determined, Mitlyng said. Diesel generators are supplying power to the reactor and the federal agency has inspectors at the plant monitoring the situation, she said.

“The facility remains in a safe condition and station experts are looking into the cause,” Krista Lopykinski, a spokeswoman at the plant, said in an e-mail. “There’s no impact to public health or safety.”

--Editors: Charlotte Porter, Margot Habiby

To contact the reporter on this story: Colin McClelland in Toronto at

To contact the editor responsible for this story: Dan Stets at

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