Estimating the time for dissolution of spent fuel exposed to unlimited water

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Description

The release of radionuclides from spent fuel cannot be precisely predicted at this point because a satisfactory dissolution model based on specific chemical processes is not yet available. However, preliminary results on the dissolution rate of UO{sub 2} and spent fuel as a function of temperature and water composition have recently been reported. This information, together with data on fragment size distribution of spent fuel, are used to estimate the dissolution response of spent fuel in excess flowing water within the framework of a simple model. In this model, the reaction/dissolution front advances linearly with time and geometry is preserved. ... continued below

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13 p.

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Leider, H.R.; Nguyen, S.N.; Stout, R.B. & Weed, H.C. December 1, 1991.

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Description

The release of radionuclides from spent fuel cannot be precisely predicted at this point because a satisfactory dissolution model based on specific chemical processes is not yet available. However, preliminary results on the dissolution rate of UO{sub 2} and spent fuel as a function of temperature and water composition have recently been reported. This information, together with data on fragment size distribution of spent fuel, are used to estimate the dissolution response of spent fuel in excess flowing water within the framework of a simple model. In this model, the reaction/dissolution front advances linearly with time and geometry is preserved. This also estimates the dissolution rate of the bulk of the fission products and higher actinides, which are uniformly distributed in the UO{sub 2} matrix and are presumed to dissolve congruently. We have used a fuel fragment distribution actually observed to calculate the time for total dissolution of spent fuel. A worst-case estimate was also made using the initial (maximum) rate of dissolution to predict the total dissolution time. The time for total dissolution of centimeter size particles is estimated to be 5.5 {times} 10{sup 4} years at 25{degrees}C.

Physical Description

13 p.

Notes

INIS; OSTI as DE92006660

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  • Other Information: PBD: Dec 1991

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  • Other: DE92006660
  • Report No.: UCRL-ID--107289
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/138328 | External Link
  • Office of Scientific & Technical Information Report Number: 138328
  • Archival Resource Key: ark:/67531/metadc627851

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  • December 1, 1991

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • Feb. 18, 2016, 3:26 p.m.

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Leider, H.R.; Nguyen, S.N.; Stout, R.B. & Weed, H.C. Estimating the time for dissolution of spent fuel exposed to unlimited water, report, December 1, 1991; California. (digital.library.unt.edu/ark:/67531/metadc627851/: accessed October 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.