Dissolution kinetics of UO sub 2 : Flow-through tests on UO sub 2. 00 pellets and polycrystalline schoepite samples in oxygenated, carbonate/bicarbonate buffer solutions at 25 degree C

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The modelling of radionuclide release from waste forms is an important part of the performance assessment of a potential, high-level radioactive waste repository. Since spent fuel consists of UO{sub 2} containing actinide elements and other fission products, it is necessary to determine the principal parameters affecting UO{sub 2} dissolution and quantify their effects on the dissolution rate before any prediction of long term release rates of radionuclides from the spent fuel can be made. As part of a complex matrix to determine the dissolution kinetics of UO{sub 2} as a function of time, pH, carbonate/bicarbonate concentration and oxygen activity, we ... continued below

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Pages: (8 p)

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

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The modelling of radionuclide release from waste forms is an important part of the performance assessment of a potential, high-level radioactive waste repository. Since spent fuel consists of UO{sub 2} containing actinide elements and other fission products, it is necessary to determine the principal parameters affecting UO{sub 2} dissolution and quantify their effects on the dissolution rate before any prediction of long term release rates of radionuclides from the spent fuel can be made. As part of a complex matrix to determine the dissolution kinetics of UO{sub 2} as a function of time, pH, carbonate/bicarbonate concentration and oxygen activity, we have measured the dissolution rates at 25{degrees} C of: (1) UO{sub 2} pellets; (2) UO{sub 2.00} powder and (3) synthetic dehydrated schoepite, UO{sub 3}.H{sub 2}O using a single-pass flow through system in an argon-atmosphere glove box. Carbonate, carbonate/bicarbonate, and bicarbonate buffers with concentrations ranging from 0.0002 M to 0.02 M and pH values form 8 to 11 have been used. Argon gas mixtures containing oxygen (from 0.002 to 0.2 atm) and carbon dioxide (from 0 to 0.011 atm) were bubbled through the buffers to stabilize their pH values. 12 refs., 2 tabs.

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Pages: (8 p)

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OSTI; NTIS; INIS; GPO Dep.

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  • Fall meeting of the European Materials Research Society, Strasbourg (France), 5-8 Nov 1991

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  • Other: DE92002667
  • Report No.: UCRL-JC-107478
  • Report No.: CONF-911109--3
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 6021724
  • Archival Resource Key: ark:/67531/metadc1102082

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  • October 1, 1991

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  • Feb. 18, 2018, 3:59 p.m.

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  • April 26, 2018, 12:50 p.m.

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Nguyen, S.N.; Weed, H.C.; Leider, H.R. & Stout, R.B. Dissolution kinetics of UO sub 2 : Flow-through tests on UO sub 2. 00 pellets and polycrystalline schoepite samples in oxygenated, carbonate/bicarbonate buffer solutions at 25 degree C, article, October 1, 1991; [Livermore,] California. (digital.library.unt.edu/ark:/67531/metadc1102082/: accessed May 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.