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Water-Steel Canister Interaction and H2 Gas Pressure Buildup in aNuclear Waste Repository

Description: Corrosion of steel canisters, stored in a repository forspent fuel and high-level waste, leads to hydrogen gas generation in thebackfilled emplacement tunnels, which may significantly affect long-termrepository safety. Previous modeling studies used a constant H2generation rate. However, iron corrosion and H2 generation rates varywith time, depending on factors such as water chemistry, wateravailability, and water contact area. To account for these factors andfeedback mechanisms, we developed a… more
Date: January 2, 2007
Creator: Xu, Tianfu; Senger, Rainer & Finstele, Stefan
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Partner: UNT Libraries Government Documents Department
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Coordination Environments of Highly Charged Cations (Ti, Cr, and Light REE's) in Borosilicate Glass/Melts to 1120C

Description: The local environments around Ti, Cr, and several light rare-earth elements (La, Ce, and Nd) were investigated by in-situ XANES spectroscopy in a number of complex borosilicate glasses and melts (to 1120 C) that are used for nuclear waste storage. Examination of the high-resolution XANES spectra at the Ti K-edge shows that the average coordination of Ti changes from {approx}5 to {approx}4.5. Cr is dominantly trivalent in the melts studied. However, its average coordination is probably lower in … more
Date: January 2, 2007
Creator: Farges, Francois; /Museum Natl. Hist. Natur. /Stanford U., Geo. Environ. Sci.; Brown, Gordon E., Jr. & /Stanford U., Geo. Environ Sci. /SLAC, SSRL
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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LONG-TERM CHANGES IN MERCURY CONCENTRATIONS IN FISH FROM THE MIDDLE SAVANNAH RIVER

Description: Total mercury levels were measured in largemouth bass (Micropterus salmoides), ''sunfishes'' (Lepomis spp)., and ''catfish'' (primarily Ameiurus spp.) from 1971 to 2004 in the middle reaches of the Savannah River, which drains the coastal plain of the southeastern U.S. Mercury levels were highest in 1971 but declined over the next ten years due to the mitigation of point sources of industrial pollution. Mercury levels began to increase in the 1980s as a possible consequence of mercury inputs fr… more
Date: January 2, 2007
Creator: Paller, M & Bill Littrell, B
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Partner: UNT Libraries Government Documents Department
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Plasma Production via Field Ionization

Description: Plasma production via field ionization occurs when an incoming particle beam is sufficiently dense that the electric field associated with the beam ionizes a neutral vapor or gas. Experiments conducted at the Stanford Linear Accelerator Center explore the threshold conditions necessary to induce field ionization by an electron beam in a neutral lithium vapor. By independently varying the transverse beam size, number of electrons per bunch or bunch length, the radial component of the electric fi… more
Date: January 2, 2007
Creator: O'Connell, C. L.; Barnes, C. D.; Decker, F.; Hogan, M. J.; Iverson, R.; Krejcik, P. et al.
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Partner: UNT Libraries Government Documents Department
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Determine the yield of micronucleated cells in primary human fibroblasts exposed to focused soft X-rays.

Description: This project was a small part of a larger collaborative study headed by Dr Aloke Chatterjee, (Lawrence Berkeley National Laboratory) and including Drs Les Braby, John Ford (Texas A&M) and Kathy Held (MGH Boston), which was developing an integrated theoretical and experimental model of the radiation-induced bystander response. Our part of the study has been to determine the effectiveness of soft X-rays at inducing chromosomal damage under conditions of direct and bystander exposure. The aim … more
Date: January 2, 2007
Creator: Prise, Kevin M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Durability of Silicate Glasses: An Historical Approach

Description: We present a short review of current theories of glass weathering, including glass dissolution, and hydrolysis of nuclear waste glasses, and leaching of historical glasses from an XAFS perspective. The results of various laboratory leaching experiments at different timescales (30 days to 12 years) are compared with results for historical glasses that were weathered by atmospheric gases and soil waters over 500 to 3000 years. Good agreement is found between laboratory experiments and slowly leac… more
Date: January 2, 2007
Creator: Farges, Francois; /Museum Natl. Hist. Natur. /Stanford U., Geo. Environ. Sci.; Etcheverry, Marie-Pierre; U., /Marne la Vallee; Haddi, Amine; U., /Marne la Valle et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Study of the OCS6 Lattice Using Frequency Maps

Description: Frequency maps are employed to study the baseline dampingring lattice. The study is aimed at understanding the reduced dynamicaperture in the lattice with four short straight sections compared to theone with eight short straight sections. Measures to increase the dynamicaperture based on results of this study are suggested.
Date: January 2, 2007
Creator: Reichel, Ina
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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USING STATISTICAL PROCESS CONTROL TO MONITOR RADIOACTIVE WASTE CHARACTERIZATION AT A RADIOACTIVE FACILITY

Description: Two facilities for storing spent nuclear fuel underwater at the Hanford site in southeastern Washington State are being removed from service, decommissioned, and prepared for eventual demolition. The fuel-storage facilities consist of two separate basins called K East (KE) and K West (KW) that are large subsurface concrete pools filled with water, with a containment structure over each. The basins presently contain sludge, debris, and equipment that have accumulated over the years. The spent fu… more
Date: January 2, 2007
Creator: Westcott, J. L.; Jochen, R. M. & Prevette, S. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Detecting and Quantifying Reductive Dechlorination During Monitored Natural Attenuation at the Savannah River CBRP Site

Description: Various attenuation mechanisms control the destruction, stabilization, and/or removal of contaminants from contaminated subsurface systems. Measuring the rates of the controlling attenuation mechanisms is a key to employing mass balance as a means to evaluate and monitor the expansion, stability and subsequent shrinkage of a contaminant plume. A team of researchers investigated the use of push-pull tests for measuring reductive dechlorination rates in situ at sites with low chlorinated solvent … more
Date: January 2, 2007
Creator: Vangelas, K; Istok, Jack D.; Field, Jennifer A.; Raes, Eric; Margaret Millings, M & Peacock, Aaron D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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New Developments in Charge Transfer Multiplet Calculations: Projection Operations, Mixed-Spin States and pi-Bonding

Description: This paper presents a number of new additions to the charge transfer multiplet calculations as used in the calculation of L edge X-ray absorption spectra of 3d and 4d transition metal systems, both oxides and coordination compounds. The focus of the paper is on the consequences of the optimized spectral simulations for the ground state, where we make use of a recently developed projection technique. This method is also used to develop the concept of a mixed-spin ground state, i.e. a state that … more
Date: January 2, 2007
Creator: de Groot, F.M.F.; U., /Utrecht; Hocking, R.K.; /Stanford U., Chem. Dept.; Piamonteze, C.; /LBL, Berkeley et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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