Japanese Evaluated Nuclear Data Library Version 3 Revision-3: JENDL-3.3.

TLDR

JENDL‑3.3 includes covariance data for 20 nuclides and its reliability was assessed via benchmark analyses of reactor and shielding performance. JENDL‑3.3 improves upon JENDL‑3.2 by correcting criticality overestimation, fixing secondary neutron energy distributions, resolving elemental‑isotopic inconsistencies, and benchmark analyses show it predicts reactor and shielding characteristics more accurately.

Abstract

Evaluation for JENDL-3.3 has been performed by considering the accumulated feedback information and various benchmark tests of the previous library JENDL-3.2. The major problems of the JENDL-3.2 data were solved by the new library: overestimation of criticality values for thermal fission reactors was improved by the modifications of fission cross sections and fission neutron spectra for 235U; incorrect energy distributions of secondary neutrons from important heavy nuclides were replaced with statistical model calculations; the inconsistency between elemental and isotopic evaluations was removed for medium-heavy nuclides. Moreover, covariance data were provided for 20 nuclides. The reliability of JENDL-3.3 was investigated by the benchmark analyses on reactor and shielding performances. The results of the analyses indicate that JENDL-3.3 predicts various reactor and shielding characteristics better than JENDL- 3.2.