The Union of Concerned Scientists' nuclear safety project director Dave Lochbaum has filed an emergency enforcement petition with the U.S. Nuclear Regulatory Commission concerning recent revelations of boric acid leakage through the Davis-Besse atomic reactor's lid near Toledo, Ohio. Similar leakage at Davis-Besse led, in 2002, to the nearest-miss to a major accident since Three Mile Island actually suffered a 50% core melt down in 1979. Due to that previous debacle, NRC fined Davis-Besse's owner, FirstEnergy, a record $5.45 million in penalties. However, this most recent leakage of corrosive boric acid appears to have again violated NRC's operating license, risking a fast-breaking breach of the reactor pressure vessel boundary and potential loss-of-coolant accident.