Neutron dosimetry of the HFIR hydraulic facility

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Description

The total, fast, and thermal neutron fluxes at five axial positions in the High Flux Isotope Reactor (HFIR) hydraulic tube have been measured using bare and/or cadmium-covered activation, fission, and helium accumulation flux monitors. The spectrum-averaged, one-group cross sections over selected energy ranges for the reactions used in the measurements were obtained using cross sections from the ENDF/B-V file, and the target region volume-integrated spectrum was calculated with DORT, a two-dimensional discrete ordinates radiation transport code. The fluxes obtained from various monitors are in good agreement. The total and fast (>l MeV) neutron fluxes vary from 1.6 {times} 10{sup 19} ... continued below

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37 p.

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Mahmood, S.T.; Mirzadeh, S.; Farrell, K.; Pace, J.V. III & Oliver, B.M. February 1, 1995.

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Description

The total, fast, and thermal neutron fluxes at five axial positions in the High Flux Isotope Reactor (HFIR) hydraulic tube have been measured using bare and/or cadmium-covered activation, fission, and helium accumulation flux monitors. The spectrum-averaged, one-group cross sections over selected energy ranges for the reactions used in the measurements were obtained using cross sections from the ENDF/B-V file, and the target region volume-integrated spectrum was calculated with DORT, a two-dimensional discrete ordinates radiation transport code. The fluxes obtained from various monitors are in good agreement. The total and fast (>l MeV) neutron fluxes vary from 1.6 {times} 10{sup 19} n/m{sup 2} {center_dot} s and 1.6 {times} 10{sup 18} n/m{sup 2} {center_dot} s, respectively at the ends (HT-1 and -9) of the facility to 4.0 {times} 10{sup 19} n/m{sup 2} {center_dot} s and 4.6 {times} 10{sup 18} n/m{sup 2} {center_dot} s, respectively, at the center (HT-5) of the facility. The thermal-to-fast (>1 MeV) flux ratio varies from about 5.4 at the center to about 6.7 at the ends of the facility. The ratio of fast flux greater than 0.1 MeV to that greater than 1 MeV is 2.0 and stays almost constant along the length of the tube.

Physical Description

37 p.

Notes

INIS; OSTI as DE95008653

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  • Other Information: PBD: Feb 1995

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  • Other: DE95008653
  • Report No.: ORNL/TM--12831
  • Grant Number: AC05-84OR21400
  • DOI: 10.2172/34421 | External Link
  • Office of Scientific & Technical Information Report Number: 34421
  • Archival Resource Key: ark:/67531/metadc675906

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  • February 1, 1995

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  • July 25, 2015, 2:20 a.m.

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  • Jan. 22, 2016, 8:16 p.m.

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Mahmood, S.T.; Mirzadeh, S.; Farrell, K.; Pace, J.V. III & Oliver, B.M. Neutron dosimetry of the HFIR hydraulic facility, report, February 1, 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc675906/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.