A LOOSE PIECE OF SCALE ESTIMATED TO WEIGH 200 TO 250 LBS FELL 2 FEET FROM THE SPIRAL WALL OF THE AREA 31 F3 FLASH TANK. THE SCALE FELL DUE TO VIBRATION CREATED WHILE REMOVING SCALE WITH A 15 LB CHICAGO PNEUMATIC HAMMER GUN. SCALE STRUCK EE ON LEFT SHOULDER AND BACK. RT ELBOW STRUCK TANK WALL ON IMPACT.