Examination plan for the soils and low-level radioactive waste forms of the NRC field testing lysimeters.

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The Field Lysimeter Investigations: Low-level Waste Data Base Development Program is obtaining information on the performance of radioactive waste forms. These experiments were recently shut down and have been examined in accordance with a detailed waste form and soil sampling plan. Ion-exchange resins from a commercial nuclear power station were solidified into waste forms using portland cement and vinyl ester-styrene. These waste forms were tested to (a) obtain information on performance of waste forms in typical disposal environments, (b) compare field results with bench leach studies, (c) develop a low-level waste data base for use in performance assessment source term ... continued below

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17 p.

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McConnell, J.W. Jr. January 16, 1998.

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The Field Lysimeter Investigations: Low-level Waste Data Base Development Program is obtaining information on the performance of radioactive waste forms. These experiments were recently shut down and have been examined in accordance with a detailed waste form and soil sampling plan. Ion-exchange resins from a commercial nuclear power station were solidified into waste forms using portland cement and vinyl ester-styrene. These waste forms were tested to (a) obtain information on performance of waste forms in typical disposal environments, (b) compare field results with bench leach studies, (c) develop a low-level waste data base for use in performance assessment source term calculations, and (d) apply the DUST computer code to compare predicted cumulative release to actual field data. The program, funded by the Nuclear Regulatory Commission (NRC), includes observed radionuclide releases from waste forms at two test sites over 10 years of successful operation. The lysimeter is a useful experimental device that is providing source term data and can be used to determine waste form stability. Lysimeters are ideal systems for obtaining actual field test data because, when properly designed and operated, they can be used to isolate soil and waste systems under actual environmental conditions. Such conditions cannot be duplicated by standard laboratory testing. The purpose of this paper is to present the experimental plan for the examination of the waste forms and soils of the two lysimeter arrays, which have now been shut down. During this examination, it is planned to characterize the waste forms after removal from the lysimeter and to compare those findings to the original characterizations. Vertical soil cores have been taken from the soil columns and will be analyzed with radiochemistry to define movement of radionuclides after release from the waste forms. A comparison is made of the DUST-predicted releases to those previously determined and reported from the lysimeter leachate analyses. That comparison uses new partition coefficients (K{sub d}) recently obtained from laboratory analysis of the lysimeter soils and sand. Those DUST code results also will be compared to actual radionuclide movements through the soil columns as determined from soil core analysis.

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17 p.

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INIS; OSTI as DE00010554

Medium: P; Size: 17 pages

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  • 18th Annual DOE Low-Level Radioactive Waste Management Conference, Salt Lake City, UT (US), 05/20/1997--05/22/1997

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  • Report No.: ANL/ER/CP-95276
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 10554
  • Archival Resource Key: ark:/67531/metadc618717

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  • January 16, 1998

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  • June 16, 2015, 7:43 a.m.

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  • April 7, 2017, 3:34 p.m.

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McConnell, J.W. Jr. Examination plan for the soils and low-level radioactive waste forms of the NRC field testing lysimeters., article, January 16, 1998; Illinois. (digital.library.unt.edu/ark:/67531/metadc618717/: accessed May 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.