Validity of Hansen-Roach cross sections in low-enriched uranium systems

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Within the nuclear criticality safety community, the Hansen-Roach 16 group cross section set has been the standard'' for use in k{sub eff} calculations over the past 30 years. Yet even with its widespread acceptance, there are still questions about its validity and adequacy, about the proper procedure for calculating the potential scattering cross section, {sigma}{sub p}, for uranium and plutonium, and about the concept of resonance self shielding and its impact on cross sections. This paper attempts to address these questions. It provides a brief background on the Hansen-Roach cross sections. Next is presented a review of resonances in cross ... continued below

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Pages: (8 p)

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Busch, R.D. (New Mexico Univ., Albuquerque, NM (United States)) & O'Dell, R.D. (Los Alamos National Lab., NM (United States)) January 1, 1991.

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Description

Within the nuclear criticality safety community, the Hansen-Roach 16 group cross section set has been the standard'' for use in k{sub eff} calculations over the past 30 years. Yet even with its widespread acceptance, there are still questions about its validity and adequacy, about the proper procedure for calculating the potential scattering cross section, {sigma}{sub p}, for uranium and plutonium, and about the concept of resonance self shielding and its impact on cross sections. This paper attempts to address these questions. It provides a brief background on the Hansen-Roach cross sections. Next is presented a review of resonances in cross sections, self shielding of these resonances, and the use of {sigma}{sub p} to characterize resonance self shielding. Three prescriptions for calculating {sigma}{sub p} are given. Finally, results of several calculations of k{sub eff} on low-enriched uranium systems are provided to confirm the validity of the Hansen-Roach cross sections when applied to such systems.

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Pages: (8 p)

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OSTI; NTIS; INIS; GPO Dep.

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  • International conference on nuclear criticality (ICNC) safety, Oxford (United Kingdom), 9-13 Sep 1991

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  • Other: DE91016021
  • Report No.: LA-UR-91-2347
  • Report No.: CONF-910993--14
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5449750
  • Archival Resource Key: ark:/67531/metadc1070990

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  • January 1, 1991

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  • Feb. 4, 2018, 10:51 a.m.

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  • May 21, 2018, 6:35 p.m.

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Busch, R.D. (New Mexico Univ., Albuquerque, NM (United States)) & O'Dell, R.D. (Los Alamos National Lab., NM (United States)). Validity of Hansen-Roach cross sections in low-enriched uranium systems, article, January 1, 1991; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1070990/: accessed December 11, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.