SINBAD ABSTRACT NEA-1517/97
Winfrith Iron Benchmark Experiment (ASPIS)
1. Name of Experiment:
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Winfrith Iron Benchmark Experiment (ASPIS)
2. Purpose and Phenomena Tested:
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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:
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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:
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The detectors used were:
Detector Diameter Thickness Mass Systematic Standard
(mm) (mm) (g) Error (%) Deviation (%)
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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:
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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. Quality Assessment:
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The ASPIS Iron experiment is ranked as an experiment of NOT of BENCHMARK
QUALITY for modern purposes.
The main drawback is that there is not primary information on the experimental
set up. Some important experimental information would need to be derived
from that used in past benchmark models and some specifications are nonetheless
inconsistent of not complete.
7. Author/Organizer
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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:
Institute Jozef Stefan, Ljubljana, Slovenia (ivan.kodeli at ijs.si)
& UKAEA/CCFE Culham, UK (ivan.kodeli at ukaea.uk)
Quality assessment:
A. Milocco,
Universita' di Milano-Bicocca, piazza della Scienza 3, Milano, Italy
8. Availability:
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Unrestricted
9. References:
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[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)
[6] A. Milocco:
Quality Assessment of SINBAD Evaluated Experiments ASPIS Iron
(NEA-1517/34), ASPIS Iron-88 (NEA-1517/35), ASPIS Graphite (NEA-1517/36),
ASPIS Water (NEA-1517/37), ASPIS N/G Water/Steel (NEA-1517/49), ASPIS PCA
Replica (NEA-1517/75), Dec. 2015.
[7] G. Hehn et al.:
Adjustment of Neutron Multigroup Cross Sections with Error Covariance
Matrices to Deep Penetration Integral Experiments
Paper presented at the Int. Conf. on Nuclear Data for Science & Technology, Antwerp, Sept. 1982
[8] M Kawai et al.:
Shielding Benchmark Tests of JENDL-3, JAERI 1330 (March 1994)
[9] I. Kodeli:
Validation of ENDF/B-VI and JEF-2 Iron Cross-sections by Sensitivity and Adjustment Analysis
(JEF-DOC-420, paper presented at NSS/EBS Regional Meeting, Portoroz, Slovenia, 1993)
[10] S.J. Chucas et al.:
Application of JEFF3T Data to the Winfrith Iron Benchmark (JEF/DOC-790, March 1999)
[11] J.C. Nimal and S.H. Zheng:
Qualification des Sections Efficaces du Fer par l'Interpretation d'un Benchmark de Penetration
Profonde des Neutrons dans un Massif de Fer, ASPIS (Rapport DMT 94/161 - SERMA/LEPP/94/1617 (1994) (in French)
10. Data and Format:
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Filename Size(bytes) Content
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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
22 QualityAssess.pdf 6.851,768 Document on quality assessment of ASPIS experiments
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.
SINBAD Benchmark Generation Date: 1992
SINBAD Benchmark Last Update: 2/2020