Approach to Assessing the Potential Effects of Colloidal Radionuclide Transport on Nuclear Waste Repository Performance

Pickett, David A.; Dam, William L.

doi:10.13182/nse05-a2533

Cited by 6 publications

(4 citation statements)

References 4 publications

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“…Generally, existing transport models have ignored the coupled factors of redox chemistry and microbial activity and have relied on empirical equilibrium or rate-limited distribution coefficient (K d ) models to address actinide retardation and colloidfacilitated transport (e.g., Glynn, 2003;Pickett, 2005;Tien and Jen, 2007). Recent experimental data from Powell and others Powell et al, 2005;Kaplan et al, 2006;Demirkanli et al, 2008) that these simplified models cannot adequately predict Pu transport because they do not capture the coupled processes controlling Pu sorption and desorption.…”

Section: Program Overviewmentioning

confidence: 99%

LLNL SFA FY11 Program Management and Performance Report: Environmental Transport of Plutonium

Kersting¹,

Zavarin²,

Powell³

et al. 2011

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Section: Program Overviewmentioning

confidence: 99%

LLNL SFA FY11 Program Management and Performance Report: Environmental Transport of Plutonium

Kersting¹,

Zavarin²,

Powell³

et al. 2011

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“…Generally, existing transport models have ignored the coupled factors of redox chemistry and microbial activity and have relied on empirical equilibrium or rate-limited distribution coefficient (K d ) models to address actinide retardation and colloidfacilitated transport (e.g., (GLYNN, 2003;PICKETT, 2005;TIEN and JEN, 2007). Recent experimental data from Powell and others (KAPLAN et al, 2004;POWELL et al, 2005;KAPLAN et al, 2006;DEMIRKANLI et al, 2008;) suggest that these simplified models cannot adequately predict Pu transport because they do not capture the coupled processes controlling Pu sorption and desorption.…”

Section: Program Overviewmentioning

confidence: 99%

Environmental Transport of Plutonium: Biogeochemical Processes at Femtomolar Concentrations and Nanometer Scales

Kersting¹,

Zavarin²

2014

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“…Reactive transport models that address geochemical processes occurring at the mineral-water interface are still in their infancy for multi-phase systems (U.S. DEPARTMENT OF ENERGY, 2007). Generally, existing transport models have ignored the coupled factors of redox chemistry and microbial activity and have relied on empirical equilibrium or rate-limited distribution coefficient (K d ) models to address actinide retardation and colloidfacilitated transport (e.g., (GLYNN, 2003;PICKETT, 2005;TIEN and JEN, 2007). Recent experimental data from Powell and others (KAPLAN et al, 2004;POWELL et al, 2005;KAPLAN et al, 2006;DEMIRKANLI et al, 2008;) suggest that these simplified models cannot adequately predict Pu transport because they do not capture the coupled processes controlling Pu sorption and desorption.…”

Section: Program Overviewmentioning

confidence: 99%

Environmental Transport of Plutonium: Biogeochemical Processes at Femtomolar Concentrations and Nanometer Scales

Kersting

2010

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is the point-of-contact for LLNL's, BER Programs and is the Acting Chief Scientist for PLS reporting directly to Bill Goldstein. This SFA program is managed through the Seaborg Institute and is aligned with the Seaborg Institute's research focus on environmental radiochemistry, nuclear forensics and super heavy element discovery. Dr. Kersting communicates BER program needs to both the Lead Scientist, Dr. Zavarin, and Program Element leads, coordinates program execution, insures financial responsibility in spending, planning, and program direction. Monthly program meetings/teleconferences with all staff members leads will serve to communicate progress and ensure that the program goals are being met. Each Program Element has a lead scientist that reports to both the SFA manager (Dr. Kersting) and lead scientist (Dr. Zavarin). Dr. Kersting reports to both LLNL senior management and BER. Dr. Zavarin ensures that Program Element efforts at LLNL and collaborating institutions are aligned with the research outlined. The majority of the experimental work (Program Elements A, C, and D) is led by LLNL scientists under the supervision of Dr. Zavarin in his environmental radiochemistry laboratories. Program Element B and E leads and their post-docs/graduate students have access to LLNL through the Laboratory's Visiting Scientist Program. The sorption/desorption experiments in Program Element B (B. Powell lead) is a coordinated effort between Clemson University and LLNL. The microbial work in Program Element E (D. Moser lead) is carried out at the Desert Research Institute in conjunction with the University of Nevada, Las Vegas radiochemistry facilities of K. Czerwinski. Characterization and isolation of microbial populations in Pu-contaminated groundwater at the NTS are coordinated through external programs (e.g., UGTA). Groundwater and sediment sample collection at other field sites is being coordinated through targeted collaborations (Hanford (A. Felmy); Tomsk, Russia (S. Kalmykov). In addition to the roles of Dr. Kersting and Dr. Zavarin discussed above, each team member is indentified below and their expertise briefly summarized. Annie Kersting-Director of the Glenn T. Seaborg Institute at LLNL, which conducts research on environmental radiochemistry and nuclear forensics. She also oversees both the postdoc (~90 postdocs) and a summer student programs (~10-summer students) in the Nuclear Forensics. Her research focuses on actinide transport in the subsurface. Dr. Kersting is the program manager for this SFA and is the lead on Program Element C: Surface precipitation of Pu polymers and field samples. The focus is on characterization of colloids in experimental and field samples using the Titan S/TEM and NanoSIMS. She co-supervises postdocs Ruth Tinnacher, Ruth Kips and James Begg (FY10 new hire), and coordinates summer students. Mavrik Zavarin-LLNL Project manager for the Underground Test Area (UGTA) program. The UGTA program is responsible for identifying the extent of radiologic contamination at the NTS. Dr. Zavarin has...

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Approach to Assessing the Potential Effects of Colloidal Radionuclide Transport on Nuclear Waste Repository Performance

Cited by 6 publications

References 4 publications

LLNL SFA FY11 Program Management and Performance Report: Environmental Transport of Plutonium

LLNL SFA FY11 Program Management and Performance Report: Environmental Transport of Plutonium

Environmental Transport of Plutonium: Biogeochemical Processes at Femtomolar Concentrations and Nanometer Scales

Environmental Transport of Plutonium: Biogeochemical Processes at Femtomolar Concentrations and Nanometer Scales

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