An integral experiment on thorium oxide/depleted uranium cylinders with D-T neutrons for 232Th(n, 2n) reaction. (July 2015)

• Record Type: Journal Article
• Authors: Feng, S.; Yang, Y.W.; Lu, X.X.; Liu, R.; Jiang, L.; Zhu, T.H.; Wang, M.; Qin, J.G.
• Is Part Of: Annals of nuclear energy. Volume 81(2015:Jul.)
• Page Start: 281
• Page End: 286
• Publication Date: 2015-07
• Subjects: 232Th(n, 2n) -- D-T neutron -- Integral experiment -- MCNP; Nuclear energy -- Periodicals; Nuclear engineering -- Periodicals; 621.4805
• DOI: 10.1016/j.anucene.2015.03.002
• Languages: English
• ISSNs: 0306-4549

Abstract

Highlights: An integral experiment for 232 Th(n, 2n) reaction was carried out on the newly-established ThO2 /depleted uranium cylinders. 232 Th(n, 2n) reaction rate distribution was obtained in the assemblies with an uncertainty of about 7%. Experiments were analyzed by MCNP code with ENDF/B-VI.8, ENDF/B-VII.0, JENDL-4.0 and CENDL-3.1 libraries. Experimental results could be used to re-evaluate the cross sections of 232 Th(n, 2n) reaction. Abstract: In order to verify the evaluated cross sections of 232 Th(n, 2n) reaction for the conceptual design of the thorium based subcritical blanket in the fusion–fission hybrid reactor, an integral experiment on thorium oxide/depleted uranium cylinders was carried out with D-T neutrons using the activation technique. 232 Th(n, 2n) reaction rate distribution was obtained at the central axis direction in the assemblies with an uncertainty of about 7%. Experiments were analyzed by using MCNP code with ENDF/B-VI.8, ENDF/B-VII.0, JENDL-4.0 and CENDL-3.1 libraries to validate the nuclear data libraries of 232 Th(n, 2n) reaction, the calculated results with JENDL-4.0 agree with the measurements the best with discrepancies within the experimental uncertainty. The average values of C / E for the three benchmark assemblies are 1.058, 1.044 and 0.980. Calculations with different evaluated libraries in the benchmark assemblies show a large discrepancy. The experimental results can be used to re-evaluate the cross sections of the 232 Th(n, 2n) reaction.