Core and shielding analysis of the SCM-100.

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It is widely accepted that an intense neutron source can be produced in a suitable target by spallation neutrons generated by a high-current high-energy proton beam. Typical beam energy for such an accelerator is 400 to 2000 MeV. A conventional critical reactor can readily be replaced by a ''sub-critical reactor'' driven by this source. A 5 MW proton beam at 600 MeV can drive a sub-critical reactor to 100 MWt. The accelerator and the associated plant support equipment at these design specifications are complex systems, but they are well within recent technology. The purpose of this study was to examine ... continued below

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36 pages

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Olson, A. P. February 11, 2002.

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Description

It is widely accepted that an intense neutron source can be produced in a suitable target by spallation neutrons generated by a high-current high-energy proton beam. Typical beam energy for such an accelerator is 400 to 2000 MeV. A conventional critical reactor can readily be replaced by a ''sub-critical reactor'' driven by this source. A 5 MW proton beam at 600 MeV can drive a sub-critical reactor to 100 MWt. The accelerator and the associated plant support equipment at these design specifications are complex systems, but they are well within recent technology. The purpose of this study was to examine core design and shielding design issues for a 100 MWt sodium-cooled fast-spectrum Sub-Critical Multiplier (SCM-100) based on LMFBR technology, but driven by an intense neutron source created by spallation reactions. SCM-100 is a component of the Accelerator Driven Test Facility. In this report we provide an overview of the SCM-100 concept. Two designs were investigated: (1) a vertical entry for the beam on the axial centerline; and (2) an inclined entry design where the core is ''C'' shaped and the beam enters the side of the target at an angle of 32 degrees. A brief overview of relevant shielding design data from EBR-II is also provided. The key result of this report is that the inclined entry design cannot achieve design objectives for radial power peaking. Consequently it cannot achieve design objectives for peak neutron flux. Axial power peaking factors are controlled by the axial fuel height and the axial reflector properties. These dimensions and compositions are very similar in SCM-100 to those of EBR-II. EBR-II had an axial power peaking factor of 1.093, and a radial power peaking factor of about 1.46. The radial power peaking of SCM-100 with the inclined entry is too extreme at 2.15, and cannot be made acceptable by modifying the size and detailed shape of the ''C'' shaped core and reflector. The axial power peaking of SCM-100 is very close to that of EBR-II. Although these conclusions were obtained using EBR-II Mark-IIIA fuel elements of a single enrichment, they are expected to be true for any single-enrichment fuel design with a similar active fuel height and similar k-infinity. Shielding of the grid plate was also investigated. The lower axial reflector thickness necessary to achieve the design lifetime was found to be 75 cm.

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36 pages

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  • Other Information: PBD: 11 Feb 2002

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  • Report No.: ANL/TD/TM02-25
  • Report No.: ANL-AAA-003
  • Grant Number: W-31-109-ENG-38
  • DOI: 10.2172/792143 | External Link
  • Office of Scientific & Technical Information Report Number: 792143
  • Archival Resource Key: ark:/67531/metadc741900

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  • February 11, 2002

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  • Oct. 19, 2015, 7:39 p.m.

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  • March 29, 2016, 4:22 p.m.

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Olson, A. P. Core and shielding analysis of the SCM-100., report, February 11, 2002; Illinois. (digital.library.unt.edu/ark:/67531/metadc741900/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.