SINBAD ABSTRACT NEA-1553/48
Osaka Nickel Sphere Benchmark Experiment (OKTAVIAN)
1. Name of Experiment: ------------------ Osaka Nickel Sphere Benchmark Experiment (OKTAVIAN) (1983) 2. Purpose and Phenomena Tested: ---------------------------- Neutron leakage spectra from a 32 cm diameter nickel sphere were measured between 30 keV and 15 MeV by the time-of-flight technique using a 14 MeV D-T neutron generator. 3. Description of the Source and Experimental Configuration: -------------------------------------------------------- A 300 keV Cockcroft-Walton type accelerator, OKTAVIAN of Osaka University was used to accelerate deuterons to a kinetic energy of 245 keV. The deuteron beam was led through a narrow tube to the centre of a nickel sphere where pulsed 14.1 MeV monochromatic neutrons were produced by the T(d,n)He-4 fusion reaction. The source strength is angle dependent (see Figures 3 and 4). The 32 cm diameter nickel sphere consisted of 99.63% Ni. 4. Measurement System and Uncertainties: ------------------------------------ The detectors used were: Detector Diameter Thickness Energy covered (cm) (cm) (MeV) --------------------------------------------------------------------- NE-213 scint. 12.7 5.08 0.03-15 NE-213 scint. 5.08 5.08 (14) neutron source monitor --------------------------------------------------------------------- Measurements of neutron spectra were carried out for high energy region (between 1 MeV and 15 MeV) and low energy region (30 keV to 15 MeV). Energy dependent statistical errors, large below about 0.04 MeV, elsewhere 1 - 10%. The uncertainty of the source spectrum in the 14 to 15 MeV energy range is about 8 %. 5. Description of Results and Analysis: ----------------------------------- Leakage current energy spectrum of neutrons was measured in "absolute values" by the time-of-flight technique between 30 keV and 15 MeV, about 9.5 m from the sphere centre. The detectors could view the entire surface of the sphere. Run-to-run neutron source monitoring was done using NE-213 detector which viewed directly the d-t source and was located at 482 cm from the target. The experimental configuration is suitable for one-dimensional modelling, although for more accurate results an explicit geometrical model including source anisotropy, and calculation in time domain is recommended. The recommended (semi) 2-D MCNP5(X) input allowing time and energy domain analysis is provided in NI2d.i. Two older computational models for the MCNP-4B code are also included: mcnp1d.inp: simple spherical 1-D model with an isotropic source mcnp3d.inp: model including sphere geometry, collimators and source anisotropy 6. Quality assessment: ----------------- The OKTAVIAN NICKEL experiment is of benchmark quality for nuclear data validation purposes. For detailed evaluation see [8]. 7. Author/Organizer ---------------- Experiment and analysis: Akito Takahashi,J. Yamamoto, K. Sumita Faculty of Nuclear Engineering Department of Engineering Osaka University 2-1 Yamadaoka, Suita-shi Osaka-fu, 565 Japan T. Kasahara, H. Hashikura, M. Akiyama, Y. Oka, S. Kondo Nuclear Engineering Research Laboratory, Faculty of Engineering University of Tokyo Tokai-mura, Ibaraki 319-11, JAPAN Compiler of data for Sinbad: I. Kodeli OECD/NEA, 12 bd des Iles, 92130 Issy les Moulineaux, France Quality assessment: A. Milocco, Institut Jožef Stefan, Jamova 39, Ljubljana, Slovenia Reviewer of compiled data: A. Trkov Institute Jozef Stefan, Jamova 39, 1000 Ljubljana, Slovenia 8. Availability: ------------ Unrestricted 9. References: ---------- [1] K. Sumita, A. Takahashi, T. Kasahara, et al: "Measurements of Neutron Leakage Spectra from 16 cm Radius Nickel Sphere", OKTAVIAN Report A-84-04 (1984) [2] A. Takahashi, J. Yamamoto, K. Oshima, et al: "Measurement of Double Differential Neutron Emission Cross Sections for Fusion Reactor Candidate Elements", Journal of Nuclear Science and Technology, Vol.21, No.8, 577-598 (1984) [3] A. Takahashi, J. Yamamoto, H. Hashikura, et al: "Measurement and Analysis of Neutron Leakage Spectrum from Nickel Sphere for 14 MeV Neutron Source", Journal of Nuclear Science and Technology, Vol.23, No.6, 477-486 (1986) [4] A. Takahashi: "Integral Neutronics Experiments at OKTAVIAN", OKTAVIAN Report B-83-01 (1983) [5] A. Trkov: "Comments on the Oktavian Nickel Sphere Benchmark", Institute Jozef Stefan, Ljubljana, Slovenia, IJS-DP-8096, July 1999. [6] NEA Nuclear Science Committee: "International Handbook of Evaluated Criticality Safety Benchmark Experiments, Nuclear Energy Agency", Organisation for Economic Co-operation and Development, NEA/NSC/DOC(95)03. [7] Yo Makita and Akito Takahashi: "IAEA Benchmark Problem Based on the Time-of-Flight Experiment on Nickel Sphere at OKTAVIAN/Osaka University", IAEA, http://ripcnt01.iaea.or.at/nds/databases/fendl/FENDL.htm. [8] A. Milocco, The Quality Assessment of the OKTAVIAN Benchmark Experiments, IJS-DP-10214, April 2009 [9] A. Milocco, A. Trkov, I. Kodeli: "The OKTAVIAN TOF Experiments in SINBAD: Evaluation of the Experimental Uncertainties", Annals of Nuclear Energy 37 (2010) pp. 443-449 10. Data and Format: --------------- DETAILED FILE DESCRIPTIONS -------------------------- Filename Size[bytes] Content ---------------- ----------- ------------- 1 okni-abs.htm 9.712 This information file 2 okni-exp.htm 30.530 Description of Experiment 3 Oktavian.pdf 2,934,763 Document describing quality assessment of OKTAVIAN experiments 4 NI2d.i 2,618 Recommended 2-D MCNP5(X) input allowing time and energy domain analysis 5 mcnp1d.inp 6.174 1-D MCNP-4B Input (OBSOLETE-cavity & detector modeling approximations) 6 mcnp3d.inp 18.159 3-D MCNP-4B Input (OBSOLETE-cavity & detector modeling approximations) 7 Ni-Fig1.tif 67.321 Figure 1: Plan view of the OKTAVIAN facility (high quality) 8 Ni-Fig2.tif 37.660 Figure 2: View of the experimental arrangement (high quality) 9 Ni-Fig3.tif 36.441 Figure 3: Angular dependence of the neutron source energy (high quality) 10 Ni-Fig4.tif 39.377 Figure 4: Angular dependence of the neutron yield (high quality) 11 Ni-Fig1.gif 14.381 Figure 1: Plan view of the OKTAVIAN facility (preview) 12 Ni-Fig2.gif 7.514 Figure 2: View of the experimental arrangement (preview) 13 Ni-Fig3.gif 10.307 Figure 3: Angular dependence of the neutron source energy (preview) 14 Ni-Fig4.gif 6.019 Figure 4: Angular dependence of the neutron yield (preview) 15 Ni-Fig5.gif 7.414 Figure 5: Leakage neutron spectrum 16 Ni-Fig6.gif 12.038 Figure 6: Leakage neutron spectrum 17 Ni-Fig7.gif 8.384 Figure 7: Source spectra comparison 18 Ni-Fig8.gif 12.211 Figure 8: Calculated leakage spectrum dependence on the source spectrum 19 Ni-Fig9.gif 12.415 Figure 9: Calculated leakage spectrum dependence on the geometrical model (1D/3D) 20 Ni-F10a.gif 11.312 Figure 10a: Calculated spectrum dependence on nuclear data (high energy)-3D model 21 Ni-F10b.gif 10.899 Figure 10b: Calculated spectrum dependence on nuclear data (low energy)-3D model 22 OKTNI_2.pdf 1.083.954 Reference 23 OKTNI_1.pdf 692.505 Reference 24 OKTNI_3.pdf 647.601 Reference 25 ane-10.pdf 585,384 Reference File OKNI_EXP.HTM contains the following tables: A table with the source neutron spectrum, and 2 tables of measured neutron leakage spectra (high and low energy range). Figures are stored in TIFF format using LZW compression and GIF (preview) format. SINBAD Benchmark Generation Date: 8/2000 SINBAD Benchmark Last Update: 2/2010
