scholarly journals FY 1999 Cold Demonstration of the Multi-Point Injection (MPI ) Process for Stabilizing Contaminated Sludge in Buried Horizontal Tanks with Limited Access at the Oak Ridge National Laboratory and Savannah River Site

2000 ◽  
Author(s):  
J L Kauschinger
Keyword(s):  
National Laboratory ◽  
Savannah River Site ◽  
Savannah River ◽  
Oak Ridge ◽  
Limited Access ◽  
Oak Ridge National Laboratory ◽  
Point Injection ◽  
River Site

scholarly journals Americium/Curium Extraction from a Lanthanide Borosilicate Glass

1996 ◽  
Vol 465 ◽  
Author(s):  
T. S. Rudisill ◽  
J. M. Pareizs ◽  
W. G. Ramsey
Keyword(s):  
National Laboratory ◽  
Fission Products ◽  
Glass Particle ◽  
Radioactive Isotopes ◽  
Dissolution Time ◽  
Savannah River ◽  
Oak Ridge ◽  
Glass Dissolution ◽  
Time Required ◽  
River Site

ABSTRACTA solution containing kilogram quantities of highly radioactive isotopes of amerícium and curium (Am/Cm) and lanthanide fission products is currently stored in a process tank at the Department of Energy's Savannah River Site (SRS). This tank and its vital support systems are old, subject to deterioration, and prone to possible leakage. For this reason, a program has been initiated to stabilize this material as a lanthanide borosilicate (LBS) glass.1 The Am/Cm has commercial value and is desired for use by the heavy isotope programs at the Oak Ridge National Laboratory (ORNL).A recovery flowsheet was demonstrated using a curium-containing glass to extract the Am/Cm from the glass matrix. The procedure involved grinding the glass to less than 200 mesh and dissolving in concentrated nitric acid at 110°C. Under these conditions, the dissolution was essentially 100% after 2 hours except for the insoluble silicon. Using a nonradioactive surrogate, the expected glass dissolution rate during Am/Cm recovery was bracketed by using both static and agitated conditions. The measured rates, 0.0082 and 0.040 g/hrcm2, were used to develop a predictive model for the time required to dissolve a spherical glass particle in terms of the glass density, particle size, and measured rate. The calculated dissolution time was in agreement with the experimental observation that the curium glass dissolution was complete in less than 2 hr.

scholarly journals Product Consistency Leach Tests of Savannah River Site Radioactive Waste Glasses

1989 ◽  
Vol 176 ◽  
Author(s):  
Ned E. Bibler ◽  
John K. Bates
Keyword(s):  
National Laboratory ◽  
Argonne National Laboratory ◽  
Savannah River Site ◽  
Good Precision ◽  
Savannah River ◽  
Consistency Test ◽  
Leach Test ◽  
Processing Facility ◽  
General Order ◽  
River Site

ABSTRACTThe Product Consistency Test (PCT) is a glass leach test developed at the Savannah River Site (SRS) to confirm the durability of radioactive nuclear waste glasses that will be produced in the Defense Waste Processing Facility. The PCT is a seven day, crushed glass leach test in deionized water at 90°C. Final leachates are filtered and acidified prior to analysis. To demonstrate the reproducibility of the PCT when performed remotely, SRS and Argonne National Laboratory have performed the PCT on samples of two radioactive glasses. The tests were also performed to compare the releases of the radionuclides with the major nonradioactive glass components and to determine if radiation from the glass was affecting the results of the PCT.The test was performed in triplicate at each laboratory. For the major soluble elements, B, Li, Na, and Si, in the glass, each investigator obtained relative precisions in the range 2–5% in the triplicate tests. This range indicates good precision for the PCT when performed remotely with master slave manipulators in a shielded cell environment. When the results of the two laboratories were compared to each other, the agreement was within 20%. Normalized concentrations for the nonradioactive and radioactive elements in the PCT leachates measured at both facilities indicated that the radionuclides were released from the glass slower than the major soluble elements in the glass. For both laboratories, the normalized releases for both glasses were in the general order Li∼B∼Na>Si>Cs-137>Sb-125>Sr-90. The normalized releases for the major soluble elements and the final pH values in the tests with radioactive glass are consistent with those for nonradioactive glasses with similar compositions. This indicates that there was no significant effect of radiation on the results of the PCT.

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