Adjustment of the (235)U Fission Spectrum

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Description

The latest nuclear data are used to examine the sensitivity of the least squares adjustment of the {sup 235}U fission spectrum to the measured reaction rates, dosimetry cross sections, and prior spectrum covariance matrix. All of these parameters were found to be very important in the spectrum adjustment. The most significant deficiency in the nuclear data is the absence of a good prior covariance matrix. Covariance matrices generated from analytic models of the fission spectra have been used in the past. This analysis reveals some unusual features in the covariance matrix produced with this approach. Specific needs are identified for ... continued below

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8 p.

Creation Information

GRIFFIN,PATRICK J. & WILLIAMS,J.G. September 14, 1999.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this article can be viewed below.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA
    Place of Publication: Albuquerque, New Mexico

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Description

The latest nuclear data are used to examine the sensitivity of the least squares adjustment of the {sup 235}U fission spectrum to the measured reaction rates, dosimetry cross sections, and prior spectrum covariance matrix. All of these parameters were found to be very important in the spectrum adjustment. The most significant deficiency in the nuclear data is the absence of a good prior covariance matrix. Covariance matrices generated from analytic models of the fission spectra have been used in the past. This analysis reveals some unusual features in the covariance matrix produced with this approach. Specific needs are identified for improved nuclear data to better determine the {sup 235}U spectrum. An improved {sup 235}U covariance matrix and adjusted spectrum are recommended for use in radiation transport sensitivity analyses.

Physical Description

8 p.

Notes

INIS; OSTI as DE00014027

Medium: P; Size: 8 pages

Source

  • Tenth International Symposium on Reactor Dosimetry, Osaka (JP), 09/12/1999--09/18/1999

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  • Report No.: SAND98-2362C
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 14027
  • Archival Resource Key: ark:/67531/metadc625963

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  • September 14, 1999

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

Description Last Updated

  • April 11, 2017, 3:52 p.m.

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GRIFFIN,PATRICK J. & WILLIAMS,J.G. Adjustment of the (235)U Fission Spectrum, article, September 14, 1999; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc625963/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.