scholarly journals Plutonium Isotopes in the Terrestrial Environment at the Savannah River Site, USA: A Long-Term Study

2015 ◽  
Vol 49 (3) ◽  
pp. 1286-1293 ◽  
Author(s):  
Christopher R. Armstrong ◽  
Patterson R. Nuessle ◽  
Heather A. Brant ◽  
Gregory Hall ◽  
Justin E. Halverson ◽  
...  
Keyword(s):  
Savannah River Site ◽  
Savannah River ◽  
Term Study ◽  
Terrestrial Environment ◽  
Plutonium Isotopes ◽  
Long Term Study ◽  
River Site

scholarly journals Modeling Long-Term Plutonium Transport in the Savannah River Site Vadose Zone

2007 ◽  
Vol 6 (2) ◽  
pp. 344-353 ◽  
Author(s):  
Deniz I. Demirkanli ◽  
Fred J. Molz ◽  
Daniel I. Kaplan ◽  
Robert A. Fjeld ◽  
Steven M. Serkiz
Keyword(s):  
Vadose Zone ◽  
Savannah River Site ◽  
Savannah River ◽  
River Site

Chemical Interactions of UOP IONSIV IE-911 (CST) with SRS Waste Simulants

2002 ◽  
Vol 713 ◽  
Author(s):  
May Nyman ◽  
James L. Krumhansl ◽  
Carlos Jove-Colon ◽  
Pengchu Zhang ◽  
Tina M. Nenoff ◽  
...  
Keyword(s):  
Savannah River Site ◽  
High Ionic Strength ◽  
Savannah River ◽  
Waste Solution ◽  
Apparent Decrease ◽  
A Minor ◽  
River Site ◽  
Kinetics Of ◽  
Oxide Precipitate

ABSTRACTIE-911 is a bound form of cystalline silicotitanate (CST) that was extensively tested for removing 137Cs from the Savannah River Site (SRS) tank wastes. In some simulant tests, column plugging incidents were observed, which led to thorough investigations to determine the causes and to develop protocols to avoid future plugging incidents. A related problem was the apparent decrease in Cs scavenging capability in some long-term tests. Our studies revealed that the interaction of IE-911 with the highly basic, high ionic strength, SRS average salt simulant could result in precipitation of; 1) poorly crystalline Nb-oxide, or 2) aluminosilicate zeolitic phases. The source for the Nb-oxide precipitate was determined to be a minor impurity phase that is a byproduct of CST manufacturing. The mechanisms of dissolution and re-precipitation of this phase in column pretreatment solution were investigated, and a protocol to rid IE-911 of this impurity was devised. The source material for the aluminosilicate zeolite precipitate was determined to be predominantly from the waste solution rather than the IE-911. Solubility experiments coupled with a thermodynamic analysis provided a protocol to predict when aluminosilicate precipitation will and will not occur. Finally, it was also established that aluminosilicate precipitation on the surfaces of the IE-911 granules could also account for an apparent decrease in equilibrium Kd and decrease in kinetics of Cs sorption.

A Fully Transient Model for Long-Term Plutonium Transport in the Savannah River Site Vadose Zone: Root Water Uptake

2008 ◽  
Vol 7 (3) ◽  
pp. 1099-1109 ◽  
Author(s):  
Deniz I. Demirkanli ◽  
Fred J. Molz ◽  
Daniel I. Kaplan ◽  
Robert A. Fjeld
Keyword(s):  
Water Uptake ◽  
Vadose Zone ◽  
Root Water Uptake ◽  
Savannah River Site ◽  
Savannah River ◽  
Transient Model ◽  
River Site

Radiochemical Separations for the Pretreatment of High-Level Nuclear Waste Solutions at the Savannah River Site

2003 ◽  
Author(s):  
D. T. Hobbs ◽  
T. B. Peters ◽  
M. C. Duff ◽  
M. J. Barnes ◽  
S. D. Fink ◽  
...  
Keyword(s):  
Nuclear Waste ◽  
Savannah River Site ◽  
Savannah River ◽  
Separation Processes ◽  
Plutonium Isotopes ◽  
High Level Nuclear Waste ◽  
Waste Separation ◽  
High Level ◽  
River Site ◽  
Fuel Reprocessing

A significant fraction of the high-level nuclear waste produced from fuel reprocessing operations at the Savannah River Site (SRS) must be pretreated to remove 137Cs, 90Sr and alpha-emitting radionuclides (i.e., actinides) prior to disposal onsite as low level waste. Separation processes planned at the SRS include caustic side solvent extraction for 137Cs and sorption onto monosodium titanate (MST) for 90Sr and alpha-emitters. The predominant alpha-emitting radionuclides in the highly alkaline waste solutions include plutonium isotopes 238Pu, 239Pu and 240Pu. This paper describes the planned Sr/actinide separation process and summarizes recent tests and demonstrations with simulated and actual tank waste solutions.

A Fully Transient Model for Long-Term Plutonium Transport in the Savannah River Site Vadose Zone: Root Water Uptake

2009 ◽  
Vol 8 (2) ◽  
pp. 530-530
Author(s):  
Deniz I. Demirkanli ◽  
Fred J. Molz ◽  
Daniel I. Kaplan ◽  
Robert A. Fjeld
Keyword(s):  
Water Uptake ◽  
Vadose Zone ◽  
Root Water Uptake ◽  
Savannah River Site ◽  
Savannah River ◽  
Transient Model ◽  
River Site

scholarly journals A New Paradigm for Long Term Monitoring at the F-Area Seepage Basins, Savannah River Site

2019 ◽  
Author(s):  
Miles E. Denham ◽  
Carol A. Eddy-Dilek ◽  
Haruko M. Wainwright ◽  
Jeffrey Thibault ◽  
Kevin Boerstler
Keyword(s):  
Savannah River Site ◽  
Savannah River ◽  
New Paradigm ◽  
Long Term Monitoring ◽  
River Site ◽  
Term Monitoring

scholarly journals Iodide Accumulation by Aerobic Bacteria Isolated from Subsurface Sediments of a129I-Contaminated Aquifer at the Savannah River Site, South Carolina

2011 ◽  
Vol 77 (6) ◽  
pp. 2153-2160 ◽  
Author(s):  
Hsiu-Ping Li ◽  
Robin Brinkmeyer ◽  
Whitney L. Jones ◽  
Saijin Zhang ◽  
Chen Xu ◽  
...  
Keyword(s):  
South Carolina ◽  
Savannah River Site ◽  
Chloride Ions ◽  
Aerobic Bacteria ◽  
Savannah River ◽  
Bacterial Strains ◽  
Contaminated Aquifer ◽  
Substrate Saturation ◽  
River Site

ABSTRACT129I is of major concern because of its mobility in the environment, excessive inventory, toxicity (it accumulates in the thyroid), and long half-life (∼16 million years). The aim of this study was to determine if bacteria from a129I-contaminated oxic aquifer at the F area of the U.S. Department of Energy's Savannah River Site, SC, could accumulate iodide at environmentally relevant concentrations (0.1 μM I−). Iodide accumulation capability was found in 3 out of 136 aerobic bacterial strains isolated from the F area that were closely related toStreptomyces/Kitasatosporaspp.,Bacillus mycoides, andRalstonia/Cupriavidusspp. Two previously described iodide-accumulating marine strains, aFlexibacter aggregansstrain and anArenibacter troitsensisstrain, accumulated 2 to 50% total iodide (0.1 μM), whereas the F-area strains accumulated just 0.2 to 2.0%. Iodide accumulation by FA-30 was stimulated by the addition of H2O2, was not inhibited by chloride ions (27 mM), did not exhibit substrate saturation kinetics with regard to I−concentration (up to 10 μM I−), and increased at pH values of <6. Overall, the data indicate that I−accumulation likely results from electrophilic substitution of cellular organic molecules. This study demonstrates that readily culturable, aerobic bacteria of the F-area aquifer do not accumulate significant amounts of iodide; however, this mechanism may contribute to the long-term fate and transport of129I and to the biogeochemical cycling of iodine over geologic time.

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