A Neutronics Methodology for the NIST Research Reactor Based on MCNXP Metadata

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  • Main Title A Neutronics Methodology for the NIST Research Reactor Based on MCNXP


  • Author: Hanson, A.
    Creator Type: Personal
  • Author: Diamond, D.
    Creator Type: Personal


  • Sponsor: United States. Department of Commerce.
    Contributor Type: Organization


  • Name: Brookhaven National Laboratory
    Place of Publication: United States


  • Creation: 2011-05-16


  • English


  • Content Description: A methodology for calculating inventories for the NBSR has been developed using the MCNPX computer code with the BURN option. A major advantage of the present methodology over the previous methodology, where MONTEBURNS and MCNP5 were used, is that more materials can be included in the model. The NBSR has 30 fuel elements each with a 17.8 cm (7 in) gap in the middle of the fuel. In the startup position, the shim control arms are partially inserted in the top half of the core. During the 38.5 day cycle, the shim arms are slowly removed to their withdrawn (horizontal) positions. This movement of shim arms causes asymmetries between the burnup of the fuel in the upper and lower halves and across the line of symmetry for the fuel loading. With the MONTEBURNS analyses there was a limitation to the number of materials that could be analyzed so 15 materials in the top half of the core and 15 materials in the bottom half of the core were used, and a half-core (east-west) symmetry was assumed. Since MCNPX allows more materials, this east-west symmetry was not necessary and the core was represented with 60 different materials. The methodology for developing the inventories is presented along with comparisons of neutronic parameters calculated with the previous and present sets of inventories.


  • Keyword: Monte Carlo
  • Keyword: Research Reactor
  • Keyword: Symmetry Research Reactor
  • Keyword: Fuel Elements
  • Keyword: Nuclear Engineering
  • STI Subject Categories: 42 Engineering
  • STI Subject Categories: 22 General Studies Of Nuclear Reactors
  • Keyword: Neutronic Parameters
  • Keyword: Computer Codes
  • Keyword: Inventories
  • Keyword: Research Reactors
  • Keyword: Burnup


  • Conference: 19th International Conference on Nuclear Engineering (ICONE19); Chiba, Japan; 20110516 through 20110519


  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI


  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article


  • Text


  • Report No.: BNL--95208-2011-CP
  • Grant Number: DE-AC02-98CH10886
  • Office of Scientific & Technical Information Report Number: 1020948
  • Archival Resource Key: ark:/67531/metadc836967