Groundwater monitoring testing at the Dresden nuclear power plant in Illinois showed elevated levels of tritium.
The sample was taken from a well on June 8 near the 2/3 contaminated water storage tank, which indicated an on-site leak. Plant owner Exelon (NYSE: EXC) said the leak is contained to Exelon property.
The plant notified the state EPA and EMA that between April 2 and June 8, elevated levels of tritium existed at the discharge of the plant, according to a report filed with the U.S. Nuclear Regulatory Commission. As part of the site investigation into the initial leak, it was found that no greater than 0.1 Curies of tritium were discharged from the site, a majority of which was discharged into the Kankakee River. An amount less than 2 percent was discharged to the Morris Illinois sewage treatment facility. This release is associated with the elevated tritium levels discovered June 7 and reported to the IEPA on June 8. Plant workers continue to monitor wells and have isolated the discharge system.
The state environmental agencies requires notification when a release to soil, groundwater or surface water goes offsite at greater than 200 pCi/Liter or remains on-site greater than 0.002 Curies.
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