International Conference on Nuclear Data for Science and Technology 2010
J. Korean Phys. Soc. 59, 1953-1956
Paper ID: ND-1449
DOI: 10.3938/jkps.59.1953
PACS: 29.85.+c, 28.20.-v
DT Neutronics Benchmark Experiment on Lead at JAEA-FNS
Kentaro Ochiai1, Keitaro Kondo1, Chihiro Suzuki2, Seiki Ohnishi1, Kosuke Takakura1, Takahiro Yagi3, Satoshi Sato1, Yuichi Abe1 and Chikara Konno1
1 Fusion Research and Development Directorate, Japan Atomic Energy Agency, Ibaraki, 319-1195, Japan
2 Department of Nuclear Engineering and Management School of Engineering, The University of Tokyo, Tokyo, 113-0033, Japan
3 Graduate School of Energy Science, Kyoto University, Osaka, 590-0494, Japan
Abstract
Lead is one of the most important candidate materials for nuclear fusion reactor blankets. We have carried out an integral benchmark experiment on lead at the DT neutron source facility of JAEA, FNS. A cubic lead assembly on a side of 45.3 cm was set up and was irradiated with the DT neutron source. Reaction rates of the 27Al(n,α)24Na, 93Nb(n,2n)92mNb, 90Zr(n,2n)89Zr, and 115In(n,n’)115mIn reactions and neutron spectra above 2 MeV were measured inside the assembly with activation foil and a small NE213 spectrometer, respectively. A Monte Carlo code, MCNP5, was adopted to calculate the reaction rates and neutron spectra. The latest nuclear data libraries, JENDL-3.3, ENDF/B-VII.0, JEFF-3.1 and FENDL-2.1, were used in the calculation. The calculation results with the three libraries except for JENDL-3.3 agreed with the measured reaction rates and neutron spectra. On the other hand, that with JENDL-3.3 underestimated the measured ones with the depth. We found out that the inappropriate evaluation of the (n,2n), elastic scattering and inelastic scattering reactions in the lead isotopes of JENDL-3.3 caused the disagreements.
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