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Integral neutronics experiments have been investigated at Institute of ModernPhysics, Chinese Academy of Sciences (IMP, CAS) in order to validate evaluatednuclear data related to the design of Chinese Initiative Accelerator DrivenSystems (CIADS). In present paper, the accuracy of evaluated nuclear data forTungsten has been examined by comparing measured leakage neutron spectra withcalculated ones. Leakage neutron spectra from the irradiation of D-T neutronson Tungsten slab sample were experimentally measured at 60$^{\circ}$ and120$^{\circ}$ by using a time-of-flight method. Theoretical calculations arecarried out by Monte Carlo neutron transport code MCNP-4C with evaluatednuclear data of the ADS-2.0, ENDF/B-VII.0, ENDF/B-VII.1, JENDL-4.0 andCENDL-3.1 libraries. From the comparisons, it is found that the calculationswith ADS-2.0 and ENDF/B-VII.1 give good agreements with the experiments in thewhole energy regions at 60$^{\circ}$, while a large discrepancy is observed at120$^{\circ}$ in the elastic scattering peak, caused by a slight difference inthe oscillation pattern of the elastic angular distribution at angles largerthan 20$^{\circ}$. However, the calculated spectra using data fromENDF/B-VII.0, JENDL-4.0 and CENDL-3.1 libraries showed larger discrepancieswith the measured ones, especially around 8.5-13.5 MeV. Further studies arepresented for these disagreements.

Measurement of Leakage Neutron Spectra for Tungsten with D-T Neutrons and Validation of Evaluated Nuclear Data