The US Nuclear Regulatory Commission has returned Exelon Generation's 920-MW Dresden-3 nuclear unit in Morris, Illinois, to normal oversight, the agency said in a letter to Exelon released Friday.
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After considering performance indicators for the unit and the results of an NRC supplemental inspection, the unit was moved to column 1 from column 2 of the agency's reactor oversight process, retroactive to October 1, NRC said in its letter, dated Thursday.
Plants are subject to increasingly greater oversight as they move to higher-numbered columns in the five-column process, with column 1 representing routine inspections.
An Exelon spokeswoman did not respond immediately to a request for comment Monday.
In February, NRC increased its oversight of Dresden-3 after issuing an inspection finding and violation related to problems with the installation of a coolant pump motor.
After a supplemental inspection was completed June 30, NRC "determined that the completed or planned corrective actions are sufficient to address the performance that led to the White Finding," the agency said in a letter accompanying its inspection report dated July 26.
The designation of the finding as white means it has low to moderate safety significance. Findings in the color-coded system of the reactor oversight process are ranked in order of increasing safety significance, with green having very low safety significance, followed by white, yellow and red.
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--Edited by Keiron Greenhalgh, email@example.com