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U.S. nuclear reactor loses power, venting system

  • A nuclear reactor at a northern Illinois plant was shut down after losing power, and steam was being vented to reduce pressure, according to officials from Exelon Nuclear and federal regulators.
  • Unit 2 at Byron Generating Station, about 153 kilometres northwest of Chicago, shut down at 10:18 a.m., after losing power, Exelon officials said. Diesel generators began supplying power to the plant, and operators began releasing steam to cool the reactor, but from the part of the plant where turbines are producing electricity, not from within the nuclear reactor itself, officials said.
  • The steam contains low levels of tritium, a radioactive form of hydrogen, but federal and plant officials insisted the levels were safe for workers and the public.
  • The U.S. Nuclear Regulatory Commission declared the incident an “unusual event,” the lowest of four levels of emergency. Commission officials also said the release of tritium was expected.
  • Exelon Nuclear officials believe a failed piece of equipment at a switchyard caused the shutdown. The switchyard is similar to a large substation that delivers power from the plant to the electrical grid, they said. Officials were still investigating the equipment failure.


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