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Fast Spectrum Reactors pp 77–109Cite as

Nuclear Data and Cross Section Processing

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Abstract

The common approach of representing energy dependence of neutron–nucleus interactions consists of discretizing the energy dependence in a number of energy groups. During the fission reactions neutrons are emitted with an average energy of approximately 2 MeV. Neutron numbers are negligibly small above 10–15 MeV, making the maximum energy of interest in most nuclear fission reactors to be of about 15 MeV. Neutrons are then slowed down to much lower energies by collisions with the reactor components.

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Notes

  1. 1.

    Multilevel theory can also be used, and this method is available in addition to the single-level formulation in the legacy MINX code and in the general purpose NJOY code. Single-level theory is usually adequate, however.

  2. 2.

    The Maxwellian distribution holds strictly only for a gas, whereas the resonance absorber is a solid. Above a temperature referred to as the Debye temperature (based on Debye’s model for solids) this distribution is satisfactory for solids. The Debye temperature for most solids is of the order of 300 K: hence, the distribution holds for the entire range of fast reactor temperatures.

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Author information

Authors and Affiliations

  1. Zachry Engineering Center, Department of Nuclear Engineering, Texas A&M University, College Station, TX, USA

    Pavel Tsvetkov

  2. Pacific Northwest National Laboratory (PNNL), Richland, WA, USA

    Alan Waltar (Retired)

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  1. Pavel Tsvetkov
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  2. Alan Waltar
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Correspondence to Pavel Tsvetkov .

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Editors and Affiliations

  1. Ingalls Creek Road 12449, Peshastin, 98847, Washington, USA

    Alan E. Waltar

  2. NuScale Power, Inc., NE Circle Blvd 1000, Corvallis, 97330, Oregon, USA

    Donald R. Todd

  3. Dept. Nuclear Engineering, Texas A & M University, College Station, 77843-3133, Texas, USA

    Pavel V. Tsvetkov

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Tsvetkov, P., Waltar, A. (2012). Nuclear Data and Cross Section Processing. In: Waltar, A., Todd, D., Tsvetkov, P. (eds) Fast Spectrum Reactors. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-9572-8_5

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  • DOI: https://doi.org/10.1007/978-1-4419-9572-8_5

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