Geochemical Data Package for Performance Assessment Calculations Related to the Savannah River Site

Kaplan, Daniel I.

doi:10.2172/1281771

Cited by 35 publications

(135 citation statements)

References 8 publications

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“…The Kd equation (Equation (2)) is numerically equivalent to the traditional Kd equation proposed in ASTM D4646 which has been used in previous sorption tests (ASTM, 2003;Kaplan, 2009). The changes observed in the Kd for each analyte were correlated with the influence the organic ligands, citrate and oxalate, had on the sorption of 133 Cs, 237 Np, 99 Tc and U to SRS soils.…”

Section: Batch Sorption Methodsmentioning

confidence: 99%

The influence of citrate and oxalate on 99TcVII, Cs, NpV and UVI sorption to a Savannah River Site soil

Montgomery

Barber

Edayilam

et al. 2017

Journal of Environmental Radioactivity

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Batch sorption experiments were conducted with 0.5-50 ppb Tc,Cs, Np and U in the presence and absence of citrate and/or oxalate in a 25 g/L Savannah River Site (SRS) soil suspension. Citrate and oxalate were the ligands of choice due to their relevancy to plant exudates, the nuclides were selected for their wide range of biogeochemical behavior, and the soil from SRS was selected as a model Department of Energy (DOE) site soil. Batch samples were continually mixed on a rotary shaker and maintained at a pH of approximately 5. Analysis via ICP-MS indicated that sorption ofNp increased with ligand concentration compared to baseline studies, as did sorption of Tc although to a lesser extent. The increased sorption ofNp is proposed to be due to a combination of factors that are dependent on the ligand(s) present in the specific system including, ligand dissolution of the soil by citrate and formation of tertiary soil-oxalate-Np complexes. The increased Tc sorption is attributed to the dissolution of the soil by the ligands, leading to an increase in the number of available sorption sites forTc. Uranium sorption decreased and dissolution of native uranium was also observed with increasing ligand concentration, thought to be a result of the formation of strong U-ligand complexes remaining in the aqueous phase. The majority of these effects were observed at the highest ligand concentrations of 50 mg/L. No notable changes were observed for the Cs system which is ascribed to the minimal interaction of Cs with these organic ligands.

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Section: Batch Sorption Methodsmentioning

confidence: 99%

The influence of citrate and oxalate on 99TcVII, Cs, NpV and UVI sorption to a Savannah River Site soil

Montgomery

Barber

Edayilam

et al. 2017

Journal of Environmental Radioactivity

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“…Finally, the average 99 Tc desorption Kd value (25.7 ± 5.9 mL/g), calculated from all 12 samples under oxidizing conditions (+264 mV), is similar to that (24 ± 5.4 mL/g) found in previous tests published by . These values are likely higher than 99 Tc desorption Kd values (0-10 mL/g) reported by Kaplan (2010) for oxidizing cementitious solids because the added BFS in these 12 samples is still acting as strong 99 Tc reductant.…”

Section: Tc Desorption Kds Using 99 Tc Sorbed Monolith Powdersmentioning

confidence: 68%

“…A Ca(OH)2-saturated solution pre-equilibrated with 0.3-2 mm size-reduced T7 monolith material was used for all 99 Tc sorption and desorption experiments. The pre-equilibration step was used to prevent large changes in pH and aqueous chemistry composition during the sorption phase in hopes of minimizing other processes, such as 99 Tc precipitation, that could affect the desorption behavior and change the pH of the Ca(OH)2-saturated solution (Almond et al 2012, Kaplan 2010. The Ca(OH)2-saturated solution simulates young/moderately aged cement pore solution and was prepared by adding approximately 15 g of reagent grade Ca(OH)2(s) to 1.5 liters of DIW that had been purged with N2 (98%) and H2 (2%) gases.…”

Section: Tc Sorption Phase Using Non-99 Tc-spiked Cementitious Matmentioning

confidence: 99%

Updated Liquid Secondary Waste Grout Formulation and Preliminary Waste Form Qualification

Saslow¹,

Um²,

Russell³

et al. 2017

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Rod in the Geosciences group at Pacific Northwest National Laboratory (PNNL) for their analytical and laboratory support. We would also like to thank Lenna Mahoney and Guzel Tartakovsky for calculation reviews and Jeff Serne for his technical review. We are grateful to Mark Bowden and Tamas Varga for xray diffraction data collection and analysis. We would like to acknowledge Maura Zimmerschied for editing this report. PNNL is a multi-program national laboratory operated by Battelle for the U.S.

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“…The geochemical data package was updated in 2016 (Kaplan 2016a(Kaplan , 2016b. The material property data package is being updated in 2020.…”

Section: (Started In 2016) -mentioning

confidence: 99%

Savannah River Site Composite Analysis (FY2019 Annual Review)

Stagich

Butcher

2020

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This document provides the Department of Energy (DOE) Order 435.1, Radioactive Waste Management (DOE 1999c) required Annual Review for the Savannah River Site (SRS) Composite Analysis (CA). Progress made to-date toward addressing the secondary issue from the LFRG review of the 2010 SRS CA has focused primarily upon inventory estimate improvements. Inventory impacts dose in a linear fashion and reduces the uncertainty with the CA conclusions. Maintenance items are addressed, as funding allows, based on the relative risk associated with meeting the performance objectives. Currently, there is minimal risk in exceeding the DOE 100 mrem/yr CA primary dose limit or the DOE 30 mrem/yr dose constraint (administrative limit). Proposed activities, discoveries, new information and changes potentially affecting the 2010 SRS CA are documented in this and earlier Annual Summary reports, and a consolidated list of changes since the 2010 CA is documented in this report. The impact to the CA of changes arising from these new PA baselines is expected to be minor for the following reasons: The primary contributors to the SRS CA dose impact at the UTR POA are the H-Canyon and Mixed Waste Management Facility (MWMF), contributing 68% and 9%, respectively, to the dose impact at that POA. The combined contribution to the UTR dose impact from all PA's (SDF, E-Area LLWF, FTF and HTF) is ~2% of this total. The 2010 SRS CA model validation performed indicates that the CA projected dose, while generally conservative, provides a reasonable representation of the maximum annual doses. Doses evaluated are well below the SRS established 15 mrem/yr administrative limit (Crapse et al. 2011). Based on the assessment presented within this annual review and collective engineering judgement, the conclusions of the 2010 SRS CA remain valid and there is reasonable assurance that SRS will meet the performance objectives delineated in DOE Order 435.1. The 2010 SRS CA should be updated to incorporate PA changes, proposed changes to inventories and sources and model improvements accumulated since the 2010 CA. The timing will be dependent on the completed of PA revisions.

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Geochemical Data Package for Performance Assessment Calculations Related to the Savannah River Site

Cited by 35 publications

References 8 publications

The influence of citrate and oxalate on 99TcVII, Cs, NpV and UVI sorption to a Savannah River Site soil

The influence of citrate and oxalate on 99TcVII, Cs, NpV and UVI sorption to a Savannah River Site soil

Updated Liquid Secondary Waste Grout Formulation and Preliminary Waste Form Qualification

Savannah River Site Composite Analysis (FY2019 Annual Review)

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