SINBAD ABSTRACT NEA-1517/34
Winfrith Iron Benchmark Experiment (ASPIS)
1. Name of Experiment: ------------------ Winfrith Iron Benchmark Experiment (ASPIS) 2. Purpose and Phenomena Tested: ---------------------------- Determination of neutron spectra and detector reaction rates at different depth in a bulk iron shield about 1 m thick. 3. Description of the Source and Experimental Configuration: -------------------------------------------------------- The source is a fission converter plate consisting of 364 natural uranium metal plates driven by a thermal flux from the extended graphite reflector of the NESTOR reactor. The energy spectrum of the source is the one of neutrons emitted from the fission of U-235; the radial dependence is cosine shaped. The iron shield consists of 24 mild steel plates 183x191x5.08 cm stacked one behind the other with 0.635 cm air gaps between adjacent plates to allow foils to be loaded. This array is followed by a 10.16 cm steel plate followed by a 30.5 cm iron shot concrete block. 4. Measurement System and Uncertainties: ------------------------------------ The detectors used were: Detector Diameter Thickness Mass Systematic Standard (mm) (mm) (g) Error (%) Deviation (%) --------------------------------------------------------------------- Au197(n,gamma) 12.7 0.05 0.125 0.9 7 Rh103(n,n') 12.7 0.25 0.20 3.0 11-14 In115(n,n') 1.6 2.0 7 S32(n,p)pellet 38.1 2.5 5.0 4.0 9 S32(n,p)cast 51.0 5.6 22. 4.0 9 NE213 Spectr. 50 50 5. Description of Results and Analysis: ----------------------------------- Detector activation measurements were carried out at 17 different depth into the iron shield: 5.72, 11.43, 17.15, 22.86, 28.58, 34.29, 40.01, 45.72, 51.44, 57.15, 52.87, 68.48, 74.30, 85.73, 91.44 102.87, 114.30 cm. (Not all detectors were placed in all positions). These were placed in the 0.635 mm air gaps between the plates. To locate the NE213 spectrometer in the shield a special 5.08 mm thick mild steel plate was inserted. A central portion, 5.08 mm wide, had been cut from the plate to leave a 5.08 cm square section air-filled slot. The measurement positions were at 22.68, 57.15, 85.73, 114.3 cm. The spectra were unfolded by the RADAK[3] computer code. A 2-D calculational model has been recommended by the authors. The corresponding input to the 2-D discrete ordinates transport code DOT-3.5 is provided. 6. Special Features: ---------------- None 7. Author/Organizer ---------------- Experiment and analysis: J. Butler, M.D. Carter, A.K. McCracken, A. Packwood: AEA Technology WINFRITH, Dorchester Dorset DT2 8DH UK Compiler of data for Sinbad: E. Sartori, OECD/NEA, 12 bd des Iles, 92130 Issy les Moulineaux, France Reviewer of compiled data: I. Kodeli, OECD/NEA, 12 bd des Iles, 92130 Issy les Moulineaux, France 8. Availability: ------------ Unrestricted 9. References: ---------- [1] J. Butler, M.D. Carter, A.K. McCracken, A. Packwood: Results and Calculational Model of the Winfrith Iron Benchmark Experiment, NEACRP-A-629 (1984) [2] A.K. McCracken: The Establishment of a Shielding Experimental Benchmark at the NEA Data Bank, NEACRP-A-1044 (1990) [3] M.J. Grimstone: The RADAK User's Manual, AEEW-M1455 (1976) [4] H. D. Carter, M. M. Chestnutt, A. K. McCracken, The ASPIS Iron Benchmark Experiment - Results and Calculational Model NEA Specialists' Meeting - Nuclear Data and Benchmarks for Reactor Shielding Paris, 27-29 October 1980 [5] S.H. Zeng, I. Kodeli, C. Raepsaet, C.M. Diop, J.C. Nimal, A. Monnier, Qualification and Improvement of Iron ENDF/B-VI and JEF-2 Evaluations by Interpretation of the ASPIS Benchmark, Proc. Symposium on Nuclear Data Evaluation Methodology, Brookhaven (1992) (JEF/DOC-447) 10. Data and Format: --------------- Filename Size[bytes] Content ---------------- ----------- ------------- 1 asfe-abs.htm 7.787 This information file 2 asfe-exp.htm 22.560 Description of Experiment 3 ASPIS_FE.INP 7.647 2-D Model for Sn code DOT-3.5 4 ASPFE-1.TIF 15.093 Figure 1: Description of Experiment (high quality) 5 ASPFE-2.TIF 20.582 Figure 2: Description of Experiment (high quality) 6 ASPFE-3.TIF 11.119 Figure 3: Description of Experiment (high quality) 7 ASPFE-4.TIF 8.442 Figure 4: Description of Experiment (high quality) 8 ASPFE-1.gif 16.538 Figure 1: Description of Experiment (preview) 9 ASPFE-2.gif 18.069 Figure 2: Description of Experiment (preview) 10 ASPFE-3.gif 10.360 Figure 3: Description of Experiment (preview) 11 ASPFE-4.gif 7.777 Figure 4: Description of Experiment (preview) 12 WIN_FE_1.pdf 547.068 Reference 13 WIN_FE_2.pdf 1.328.671 Reference 14 WIN_FE_4.pdf 1.528.391 Reference 15 WIN_FE_5.pdf 424.239 Reference 16 WIN_FE_6.pdf 1.166.545 Reference 17 EUR_17.pdf 431.639 Reference 18 j1330.pdf 3.824.302 Reference 19 jef-420.pdf 285.114 Reference 20 jef-790.pdf 53.906 Reference 21 Radak.pdf 1.109.263 Reference Tables: 1. Dimensions and compositions of source (excluding fission plate) 2. Dimensions and compositions of fission plate materials 3. Chemical analysis of the iron shield and iron shot concrete 4. Zone material densities for the ASPIS iron benchmark model 5. Centerline activation measurements: Rh103, In115, S32, Au197 6. Fluxes of NE213 Spectrometer at positions 22.86, 57.15, 85.73, 114.3 cm The data is provided in tabular form: reaction rates vs depth and spectrum vs energy.
