WELDOR WAS WORKING ON A BROKEN WATER LINE IN THEPELLET PLANT NEAR THE #501 OVERHEAD DOOR. HE MANUALLY ATTEMPTED TO MOVE SOME CONDUIT TO GET MORECLEARANCE FOR A 10"" PIPE & FELT A ""PULLING"" SENS ATION IN HIS ABDOMEN. HE WAS LATER DIAGNOSED WITH A HERNIA THAT WAS REPAIRED ON 1/11/01.