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Graphite is a candidate of moderator in innovative nuclear reactors such as high-temperature gas-cooled reactors and molten salt reactors. Scattering of thermal neutrons by a moderator material has a significant impact on the reactor core design. To contribute to the development of the innovative nuclear reactors, thermal neutron scattering law data for nuclear-grade graphite were evaluated. Inelastic scattering component due to lattice vibration was evaluated based on phonon density of states computed with first-principles lattice dynamics simulations. The simulations were performed for ideal crystalline graphite. The evaluated inelastic scattering component well reproduced the experimental double-differential cross sections of scattered neutrons from nuclear-grade isotropic graphite measured at Materials and Life science experimental Facility (MLF) of J-PARC. Coherent elastic scattering component due to crystal structure was evaluated based on the neutron scattering and transmission experiments performed at MLF of J-PARC. Regarding comparison with the neutron transmission experiment, it was found that the quantification of small-angle neutron scattering due to structures larger than crystal, such as pores in graphite, is important. [ABSTRACT FROM AUTHOR]

Evaluation of covariance for JENDL was virtually started after the release of JENDL-3.2. The covariance data were obtained for 16 nuclides and compiled to the JENDL-3.2 Covariance File. At the time of the JENDL-4.0 development, covariances were much enhanced especially for actinides; covariance data were given for 99 nuclides in total. The latest version JENDL-5 includes covariance data for 105 nuclides by adding new evaluations for light nuclides and structure materials. An overview of the covariance evaluation for JENDL is presented. [ABSTRACT FROM AUTHOR]