REPAIRMAN EE WAS CARRYING A FEW PIECES OF STEEL IN HIS LEFT HAND AND HIS BUCKET OF TOOLS IN HIS RIGHT TO GO UP THE #6 PREHEATER STAIRWAY. HE APPROACHED THE GROUND LEVEL CONCRETE SUPPORT PAD AN D SUDDENLY SLIPPED AND FELL INTO THE LEFT SIDE HANDRAIL. HE STRUCK HIS LEFT SIDE RIB/CHEST AREA AS HE FELL INTO THE LOWER STAIRWAY HANDRAIL. HE CONTINUED WORKING THE REMAINDER OF THE DAY AND