Reactor physics input to the safety analysis report for the High Flux Isotope Reactor

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Description

HFIR specific, few group neutron and coupled neutron-gamma libraries have been prepared. These are based on data from ENDF/B-V and beginning-of-life (BOL) conditions. The neutron library includes actinide data for curium target rods. Six critical experiments, collectively designated HFIR critical experiment 4, were analyzed. Calculated k-effective was 2% high at BOL-typical conditions but was 1.0 at end-of-life-typical conditions. The local power density distributions were calculated for each of the critical experiments. The axially averaged values at a given radius were frequently within experimental error. However at individual points, the calculated local power densities were significantly different from the experimentally derived ... continued below

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124 p.

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Primm, R. T. III March 1, 1992.

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Description

HFIR specific, few group neutron and coupled neutron-gamma libraries have been prepared. These are based on data from ENDF/B-V and beginning-of-life (BOL) conditions. The neutron library includes actinide data for curium target rods. Six critical experiments, collectively designated HFIR critical experiment 4, were analyzed. Calculated k-effective was 2% high at BOL-typical conditions but was 1.0 at end-of-life-typical conditions. The local power density distributions were calculated for each of the critical experiments. The axially averaged values at a given radius were frequently within experimental error. However at individual points, the calculated local power densities were significantly different from the experimentally derived values (several times greater than experimental uncertainty). A reassessment of the foil activation data with transport theory techniques seems desirable. Using the results of the critical experiments study, a model of current HFIR configuration was prepared. As with the critical experiments, BOL k-effective was high (3%). However, end-of-life k-effective was high (2%). The end-of-life concentrations of fission products were compared to those generated using the ORIGEN code. Agreement was generally good through differences in the inventories of some important nuclides, Xe and I, need to be understood. End-of-cycle curium target isotopics based on measured, discharged target rods were compared to calculated values and agreement was good. Axial flux plots at various irradiation positions were generated. Time-dependent power distributions based on two-dimensional calculations were provided.

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124 p.

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OSTI; NTIS; INIS; GPO Dep.

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  • Other Information: PBD: Mar 1992

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  • Other: DE92010369
  • Report No.: ORNL/TM--11956
  • Grant Number: AC05-84OR21400
  • DOI: 10.2172/10132630 | External Link
  • Office of Scientific & Technical Information Report Number: 10132630
  • Archival Resource Key: ark:/67531/metadc1315087

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Office of Scientific & Technical Information Technical Reports

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  • March 1, 1992

Added to The UNT Digital Library

  • Nov. 3, 2018, 11:47 a.m.

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Primm, R. T. III. Reactor physics input to the safety analysis report for the High Flux Isotope Reactor, report, March 1, 1992; United States. (digital.library.unt.edu/ark:/67531/metadc1315087/: accessed November 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.