Plutonium Solubility in Simulated Savannah River Site Waste Solutions

Rudisill, Tracy S.; Hobbs, D.T.; Edwards, T. Bradley

doi:10.1080/01496395.2010.494090

Cited by 4 publications

(7 citation statements)

References 9 publications

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“…Comparison of the results to predictions generated using statistically-based models developed at SRNL, [5] revealed that the models predict the solubility relatively well in some cases (particularly for relatively short time scales) but not in others. The uranium model predicted solubilities very similar to the observed values at 50-100 days for Samples 2, 3 and 5.…”

Section: Resultsmentioning

confidence: 99%

“…Part of these studies involved the determination of actinide solubilities in various simulated SRS process solutions of prototypical chemical composition. [4][5] Studies by other groups have focused on the determination of actinide solubilites in simulated Hanford waste solutions [6] and on determining actinide speciation and solubility in other highly alkaline solutions [7][8][9][10] .…”

mentioning

confidence: 99%

“…We have developed statistical models to predict uranium and plutonium solubility in these complicated solutions based on measured solubility data and selected compositional parameters using simulated waste supernates. [4][5] Plutonium predictions include the most recent model version incorporating results published by Rudisill. [5] As is frequently the case under environmental conditions, the chemistry of the actinides in alkaline waste slurries may be largely determined by oxide, hydroxide, carbonate and mixed hydroxy-carbonate complexes and phases.…”

mentioning

confidence: 99%

“…Relatively little study has focused on actinide chemistry under the highly alkaline conditions found in nuclear waste storage tanks, although the chemistry has received greater attention in recent years. [3][4][5][6][7][8][9][10] Millions of gallons of radioactive waste produced as a legacy by-product of nuclear weapons production are stored primarily at two US Department of Energy sites in Richland, WA (Hanford Site) and Aiken, SC (Savannah River Site). Large volumes of highly acidic radioactive waste solutions were generated beginning in the 1940's from the processing of irradiated nuclear fuel materials.…”

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confidence: 99%

“…[4][5] Plutonium predictions include the most recent model version incorporating results published by Rudisill. [5] As is frequently the case under environmental conditions, the chemistry of the actinides in alkaline waste slurries may be largely determined by oxide, hydroxide, carbonate and mixed hydroxy-carbonate complexes and phases. Under tank waste conditions uranium is expected to exist as the hexavalent uranyl ion, UO 2…”

mentioning

confidence: 99%

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Solubility of Uranium and Plutonium in Alkaline Savannah River Site High Level Waste Solutions

King

Edwards

Hobbs

et al. 2010

Separation Science and Technology

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Five actual Savannah River Site tank waste samples and three chemically-modified samples were tested to determine solubility limits for uranium and plutonium over a one year time period. Observed final uranium concentrations ranged from 7 mg U/L to 4.5 g U/L. Final plutonium concentrations ranged from 4 µg Pu/L to 12 mg Pu/L. Actinide carbonate complexation is believed to result in the dramatic solubility increases observed for one sample over long time periods. Clarkeite, NaUO 2 (O)OH · H 2 O, was found to be the dominant uranium solid phase in equilibrium with the waste supernate in most cases.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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Solubility of Uranium and Plutonium in Alkaline Savannah River Site High Level Waste Solutions

King

Edwards

Hobbs

et al. 2010

Separation Science and Technology

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Chemical Disposition of Plutonium in Hanford Site Tank Wastes

Delegard

Jones

2015

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This report examines the chemical disposition of plutonium (Pu) in Hanford Site tank wastes, by itself and in its observed and potential interactions with the neutron absorbers aluminum (Al), cadmium (Cd), chromium (Cr), iron (Fe), manganese (Mn), nickel (Ni), and sodium (Na). Consideration also is given to the interactions of plutonium with uranium (U). No consideration of the disposition of uranium itself as an element with fissile isotopes is considered except tangentially with respect to its interaction as an absorber for plutonium. into plutonium and absorber element behavior under alkaline and plant process conditions. Three external reviewers, Scott Barney, independent consultant, and David Hobbs and Tracy Rudisill of the Savannah River National Laboratory examined the near-complete document and provided insightful, germane, and complementary comments. We thank Reid Peterson (PNNL) for project oversight and Lisa Staudinger (PNNL) for her attention and care in formatting and technically editing this manuscript. Finally, we gratefully acknowledge the fundamental and applied research into the chemistry of plutonium and other transuranic elements in alkaline media conducted by scientists and technicians of the Institute of Physical Chemistry of the Russian Academy of Sciences. In particular we note the scientific leadership of Professors

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Technical Evaluation of Accelerated Basin De-Inventory Material Addition to Sludge Batch 11

MARTINO¹,

Johnson²,

Lambert³

et al. 2023

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The Accelerated Basin De-inventory (ABD) program involves discarding spent nuclear fuel that is currently stored in L-Basin to the Defense Waste Processing Facility (DWPF) for vitrification. The first ABD discards will occur during the preparation of Sludge Batch (SB) 11. Savannah River Mission Completion has requested that the Savannah River National Laboratory assess the technical gaps related to the increased gadolinium poisoning requirement and the impacts of performing the Low Temperature Aluminum Dissolution (LTAD) process in Tank 51 with H-Canyon discards present.The following summarizes the evaluation of the impacts of increasing the quantity of gadolinium (and related topics) from what was previously evaluated in the SRNL studies of gadolinium-poisoned ABD material solubility, the overall ABD flowsheet review, and increasing the fissile mass loading in glass: Based on literature surveys, there is no indication that organic interactions with gadolinium will be significant at the high pH (typically >13) conditions of the Concentration, Storage, and Transfer Facilities. Any interactions of gadolinium with organics in DWPF are not expected to adversely impact DWPF or downstream facilities. Thus, there is little-to-no residual risk from organic interactions with gadolinium. [Gap closed]  Increasing the gadolinium mass ratio to 3.0:1 Gd: 235 U(eq SLU ) should lead to the same or higher partitioning of gadolinium into the solid phase within the DWPF Chemical Process Cell, resulting in both liquid and solid phases with expected partitioning of Gd consistent with the prior solubility study. [Gap closed for SB11]  There are no expected impacts on DWPF melt temperature and melter operations due to the minimal ~0.2 weight percent (wt%) increase in Gd concentration relative to previous sludge batches.[Gap closed for SB11]  As observed previously, Gd is expected to enter the off-gas system via physical entrainment, but at a slightly higher concentration than what was observed for SB9 melter off-gas pluggage deposits (0.07 wt%). [Gap closed for SB11]  There are no expected impacts on DWPF recycle or the Recycle Collection Tank glycolate destruction process. [Gap closed for SB11]  Gd is projected to be a trace component in the SB11 glass (<0.5 wt%) and can be ignored for process control. Trace components do not significantly impact glass durability, thus the conclusions of the previous Product Consistency Test evaluation at a fissile mass loading of 2,500 g fissile/m 3 glass still applies to SB11. The ~0.1 wt% increase in Gd 2 O 3 concentration relative to the previous study will not impact the predictability of SB11 glass with the DWPF Product Composition Control System (PCCS) models for durability or the acceptability of glass according to the Waste Acceptance Product Specifications (WAPS) criterion for product consistency. [Gap closed for SB11]  No additional Toxicity Characteristic Leaching Procedure testing is necessary for SB11 and the hazardous waste specification of the SB11 DWPF waste form is unchanged a...

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Plutonium Solubility in Simulated Savannah River Site Waste Solutions

Cited by 4 publications

References 9 publications

Solubility of Uranium and Plutonium in Alkaline Savannah River Site High Level Waste Solutions

Solubility of Uranium and Plutonium in Alkaline Savannah River Site High Level Waste Solutions

Chemical Disposition of Plutonium in Hanford Site Tank Wastes

Technical Evaluation of Accelerated Basin De-Inventory Material Addition to Sludge Batch 11

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