Abstract
ACE and MATXS files of the preliminary version of JENDL High Energy File (JENDL-HEF) were produced with the modified NJOY99.24 code for benchmark tests. A test calculation and a benchmark analysis of the JAERI/TIARA shielding experiment on iron indicated that the processing had no problem for incident neutron files. Detail benchmark tests of JENDL-HEF by using the ACE and MATXS files are under way in the Subcommittee of JENDL High Energy File Integral Test Working Group in JNDC.