There was a minor mishap at the Cooper Nuclear Station near Brownville, Nebraska, last weekend when a contractor dropped a 14-foot blade onto the reactor core.

Saturday, during a planned refueling outage, crews were switching out underwater control blades when one fell onto the reactor core in a section that contained no fuel, according to the Nebraska Public Power District. There was no damage, no radiation leakage and no threat to public safety, NPPD spokesman Mark Becker said.