Examination plan for the soils and low-level radioactive waste forms of the NRC field testing lysimeters. Page: 1 of 17
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EXAMINATION PLAN FOR THE SOILS AND LOW-LEVEL RADIOACTIVE
WASTE FORMS OF THE NRC FIELD TESTING LYSIMETERS
John W. McConnell, Jr., Robert D. Rogers, Julie D. Jastrow,'
Steven R. Cline,' Terry M. Sullivan,' and Mark Fuhrmann*
Idaho National Engineering and Environmental Laboratory
P.O. Box 1625, Idaho Falls, Idaho 83415-2208 C
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 (Kd) 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.
a. Argonne National Laboratory, Argonne, IL 60439.
b. Oak Ridge National Laboratory, Oak Ridge, TN 37831.
c. Brookhaven National Laboratory, Upton, NY 11973.
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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/m1/1/: accessed February 23, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.