Japanese Evaluated Nuclear Data Library, version-1

The first version of Japanese Evaluated Nuclear Data Library, JENDL-1, was compiled as one of the most important activities of Japanese Nuclear Data Committee (JNDC) and JAERI Nuclear Data Center. JENDL-1 includes 72 nuclides most of which are needed for the study of the fast breeder reactors. This report presents a record on compilation of these nuclides, except for the data of the fission product nuclides. Compilation work on JENDL-1 was performed by a JENDL-1 compilation group which was organized in JNDC. The compilation-group members worked to select the most reliable data from among available evaluation works. When there were no relevant data, they made reevaluation and recalculation. In particular, unresolved resonance parameters for 235U, 238U, 239Pu, 240Pu, and 241Pu were carefully investigated and provided. Data compiled in JENDL-1 were taken mainly from evaluation works done by working groups of JNDC and by individuals in various organizations in Japan. When the data in ENDF/B-IV are judged to be the best, the JENDL-1 compilation group recommends the use of ENDF/B-IV for those data. Therefore, they are excluded from JENDL-1. JENDL-1 was released in autumn 1977, after its reliability had been examined through benchmark tests on the integral data. (author)