WHILE WORKING WITH THE PLANT MAINTENANCE DEPT DURING ANNUAL SHUT DOWN. HE GOT HIS LEFT INDEX FINGER CAUGHT BETWEEN A POPPIT VALVE DISC SEAL HE WAS INSIDE THE CLEAN AIR DUCT WITH A WRENCH ATTEM PTING TO LOOSEN THE JAM NUT ON THE POPPIT VALVE EE REPAIR WITH 8 YRS EXPERIENCE WAS TIGHTENING TO ADJ. NUT ON THE OPPOSITE SIDE OF THE DISC. WORKER WAS ALSO WORKING WITH MAINTENANCE WAS HOLDI