An Analysis of the HEW-MET-FAST-035 Problem Using CENTRM and SCALE

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An U/Fe benchmark, designated as HEU-MET-FAST-035, has been approved for inclusion in the International Handbook of Evaluated Criticality Safety Benchmark Experiments. The SCALE code and cross sections performed poorly in calculating this critical experiment. Deficiencies in both the ENDF/B-V representation of the resonance region for Fe and in the Nordheim integral treatment when applied to Fe were identified. The combination of these deficiencies led to an almost 10% over-prediction of k(eff). Problems involving a large percentage of Fe and intermediate-energy spectrums present special cross-section processing difficulties for SCALE. In ENDF/B-V, resonance data for Fe only go to 400 keV, although ... continued below

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7 pages

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Hollenbach, D.F. & Jordan, W.C. September 20, 1999.

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An U/Fe benchmark, designated as HEU-MET-FAST-035, has been approved for inclusion in the International Handbook of Evaluated Criticality Safety Benchmark Experiments. The SCALE code and cross sections performed poorly in calculating this critical experiment. Deficiencies in both the ENDF/B-V representation of the resonance region for Fe and in the Nordheim integral treatment when applied to Fe were identified. The combination of these deficiencies led to an almost 10% over-prediction of k(eff). Problems involving a large percentage of Fe and intermediate-energy spectrums present special cross-section processing difficulties for SCALE. In ENDF/B-V, resonance data for Fe only go to 400 keV, although resonances are present well above 1 MeV. Significant resonance data are stored as file 3 data instead of as resonance parameters. The Nordheim Integral Treatment used in NITAWL to process cross sections assume: resonances are widely spaced and all relevant information is contained in the resonance parameters (file 3 data is not processed). These limitations and assumptions result in poor solutions for this class of problems.

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7 pages

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  • ICNC'99, 6th International Conference on Nuclear Criticality Safety, Palais des congres, Versailles, France, September 20-24, 1999

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  • Other: DE00007466
  • Report No.: ORNL/CP-102951
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 7466
  • Archival Resource Key: ark:/67531/metadc711629

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  • September 20, 1999

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  • Sept. 12, 2015, 6:31 a.m.

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  • Feb. 15, 2016, 12:16 p.m.

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Hollenbach, D.F. & Jordan, W.C. An Analysis of the HEW-MET-FAST-035 Problem Using CENTRM and SCALE, article, September 20, 1999; Oak Ridge, Tennessee. (digital.library.unt.edu/ark:/67531/metadc711629/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.