EMPLOYEE WAS WORKING ON THE 5TH FLOOR OF THE PREP PLANT WORKING ON #122 RAW CON/SCREEN. THE SCREEN HAD LOCKED UP AND EMPLOYEE WAS TRYING TO FREE UP SCREEN WITH A PIPE WRENCH ATTACHED TO A COUN TER BALANCE. THE SCREEN BROKE FREE CAUSING THE EMPLOYEE'S RIGHT HAND TO STRIKE AGAINST A PIECE OF ANGLE IRON RESULTING IN A LACERATION TO THE BACK OF HIS RIGHT RING FINGER REQUIRING 11 SUTURE