AT APPROX. 7:30 AM ON 7-24-00 MGO PLANT OPERATOR EE WAS IN THE MGO PLANT WALKING TO CHECK ON TH TRANSFER TANK. WHEN HE WAS BETWEEN THE 401 TANK AND THE DRYER, HE CAUGHT HIS SHOE ON A PIECE OF GRATING THAT COVERS A DRAIN AND FELL, LANDING ONHIS LEFT ELBOW. X RAY NEG PHYSICIAN DX CONTUSION AND BURSITIS OF THE LEFT ELBOW. RX ICE, NAPROSYN AND TYLENOL, AND NO LIFTING OVER 20 LBS.