EMPLOYEE WAS WALKING DOWN METAL GRATING STAIRS FROM THE SECOND FLOOR OF THE STOKER PLANT. HIS FEET SLIPPED ON THE WET GRATING AND HE FELL BACKWARDS. THE FORCE OF THE IMPACT CAUSED A SHARP PAIN IN HIS RIGHT SHOULDER. EE CONTINUED TO WORK WITHOUT RESTRICTIONS UNTIL OCT 7, 2002, WHICH WAS HIS LAST DAY OFF.