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Investigations on Repository Near-Field Thermal Modeling - Repository Science/Thermal Load Management & Design Concepts (M41UF033302)

Description: The various layers of material from the waste package (such as components of the engineered barrier system and the host rock surface) to a given distance within the rock wall at a given distance can be described as concentric circles with varying thermal properties (see Figure 5.1-1). The selected model approach examines the contributions of the waste package, axial waste package neighbors and lateral neighboring emplacement drifts (see Section 5.2.1 and Appendix H, Section 2). In clay and deep… more
Date: July 15, 2011
Creator: Sutton, M.; Blink, J. A.; Fratoni, M.; Greenberg, H. R. & Ross, A. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Bentonite alteration due to thermal-hydro-chemical processes during the early thermal period in a nuclear waste repository

Description: After closure of an underground nuclear waste repository, the decay of radionuclides will raise temperature in the repository, and the bentonite buffer will resaturate by water inflow from the surrounding host rock. The perturbations from these thermal and hydrological processes are expected to dissipate within hundreds to a few thousand years. Here, we investigate coupled thermal-hydro-chemical processes and their effects on the short-term performance of a potential nuclear waste repository lo… more
Date: February 1, 2011
Creator: Xu, T.; Senger, R. & Finsterle, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Radioactive Demonstrations of Fluidized Bed Steam Reforming as a Supplementary Treatment for Hanford's Low Activity Waste and Secondary Wastes

Description: The U.S. Department of Energy's Office of River Protection (ORP) is responsible for the retrieval, treatment, immobilization, and disposal of Hanford's tank waste. Currently there are approximately 56 million gallons of highly radioactive mixed wastes awaiting treatment. A key aspect of the River Protection Project (RPP) cleanup mission is to construct and operate the Waste Treatment and Immobilization Plant (WTP). The WTP will separate the tank waste into high-level and low-activity waste (LAW… more
Date: February 24, 2011
Creator: Jantzen, Carol M.; Crawford, C. L.; Cozzi, A. D.; Bannochie, C. J.; Burket, P. R. & Daniel, W. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Constitutive relationships for elastic deformation of clay rock: Data Analysis

Description: Geological repositories have been considered a feasible option worldwide for storing high-level nuclear waste. Clay rock is one of the rock types under consideration for such purposes, because of its favorable features to prevent radionuclide transport from the repository. Coupled hydromechanical processes have an important impact on the performance of a clay repository, and establishing constitutive relationships for modeling such processes are essential. In this study, we propose several cons… more
Date: April 15, 2011
Creator: Liu, H. H.; Rutqvist, J. & Birkholzer, J. T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Core-Based Integrated Sedimentologic, Stratigraphic, and Geochemical Analysis of the Oil Shale Bearing Green River Formation, Uinta Basin, Utah

Description: An integrated detailed sedimentologic, stratigraphic, and geochemical study of Utah's Green River Formation has found that Lake Uinta evolved in three phases (1) a freshwater rising lake phase below the Mahogany zone, (2) an anoxic deep lake phase above the base of the Mahogany zone and (3) a hypersaline lake phase within the middle and upper R-8. This long term lake evolution was driven by tectonic basin development and the balance of sediment and water fill with the neighboring basins, as pos… more
Date: April 11, 2011
Creator: Birgenheier, Lauren P. & Michael D. Vanden Berg,
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

Reverse engineering the ancient ceramic technology based on X-ray fluorescence spectromicroscopy

Description: We present results of X-ray fluorescence (XRF) microprobe analyses of ancient ceramic cross-sections aiming at deciphering the different firing protocols used for their production. Micro-focused XRF elemental mapping, Fe chemical mapping and Fe K-edge X-ray absorption near edge structure spectroscopy were performed on pre-sigillata ceramics from southern Gaul, and terra Sigillata vessels from Italy and southern Gaul. Pieces from the different workshops and regions showed significant difference … more
Date: July 6, 2011
Creator: Sciau, Philippe; Leon, Yoanna; Goudeau, Philippe; Fakra, Sirine C.; Webb, Sam & Mehta, Apurva
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Sediment Properties: E-Area Completion Project

Description: To accommodate a future need for additional waste disposal facilities at the Savannah River Site, the Solid Waste Management Division (SWMD) designated nine additional plots for development (Kasraii 2007; SRS 2010); these plots are collectively known as the E Area Completion Project (ECP). Subsurface samples were collected from ECP plots 6, 7, 8 and 9 (Figure 1) for chemical and physical property analyses to support Performance Assessment (PA) and Special Analyses (SA) modeling. This document s… more
Date: April 29, 2011
Creator: Millings, M.; Bagwell, L.; Amidon, M. & Dixon, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mitigation of Hydrogen Gas Generation from the Reaction of Uranium Metal with Water in K Basin Sludge and Sludge Waste Forms

Description: Prior laboratory testing identified sodium nitrate and nitrite to be the most promising agents to minimize hydrogen generation from uranium metal aqueous corrosion in Hanford Site K Basin sludge. Of the two, nitrate was determined to be better because of higher chemical capacity, lower toxicity, more reliable efficacy, and fewer side reactions than nitrite. The present lab tests were run to determine if nitrate’s beneficial effects to lower H2 generation in simulated and genuine sludge continue… more
Date: June 8, 2011
Creator: Sinkov, Sergey I.; Delegard, Calvin H. & Schmidt, Andrew J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Molecular dynamics simulations of the electrical double layer on smectite surfaces contacting concentrated mixed electrolyte (NaCl-CaCl2)

Description: We report new molecular dynamics results elucidating the structure of the electrical double layer (EDL) on smectite surfaces contacting mixed NaCl-CaCl{sup 2} electrolyte solutions in the range of concentrations relevant to pore waters in geologic repositories for CO{sub 2} or high-level radioactive waste (0.34-1.83 mol{sub c} dm{sup -3}). Our results confirm the existence of three distinct ion adsorption planes (0-, {beta}-, and d-planes), often assumed in EDL models, but with two important qu… more
Date: April 1, 2011
Creator: Bourg, I.C. & Sposito, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Structure and Function of Subsurface Microbial Communities Affecting Radionuclide Transport and Bioimmobilization

Description: The objectives of this project were to: (1) isolate and characterize novel anaerobic prokaryotes from subsurface environments exposed to high levels of mixed contaminants (U(VI), nitrate, sulfate), (2) elucidate the diversity and distribution of metabolically active metal- and nitrate-reducing prokaryotes in subsurface sediments, and (3) determine the biotic and abiotic mechanisms linking electron transport processes (nitrate, Fe(III), and sulfate reduction) to radionuclide reduction and immobi… more
Date: June 15, 2011
Creator: Kostka, Joel E.; Kerkhof, Lee; Chin, Kuk-Jeong; Keller, Martin & Stucki, Joseph W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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