Missouri's sole nuclear power plant is back online after being shut down for more than three weeks.
Ameren Missouri's Callaway Energy Center was taken off line July 26 after an electrical arc caused a small fire. The plant resumed operations Sunday morning. Spokesman Cleve Reasoner says the arc was triggered when a ventilation louver came loose and got too close to the power cables.
"Testing confirmed that there was no impact to the major components," Reasoner said. "So the repairs were those that were associated directly with correction of the arc damage."