http://www.reuters.com/article/ELECTU/idUSN2326085720091123NEW YORK, Nov 23 (Reuters) - About 150 workers in a containment building at the Three Mile Island nuclear plant in Pennsylvania have returned to work a day after being sent home when monitors detected a radiation leak, Exelon Corp (EXC.N) said on Monday.
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In the latest incident, workers were cutting a pipe as part of the refueling and maintenance activities. There were some small irradiated particles inside the pipe, a spokeswoman said. Ventilation fans dislodged the irradiated particles and contaminated the indoor air, the company said.
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As of Sunday night, tests showed that 12 of the 150 workers received a detectable amount of radiation. The highest was 38.4 millirem, less than 1 percent of the federal occupational exposure limit of 5,000 millirem per year. Exelon said it has a more conservative standard of 2,000 per year.
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