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in publisher: "United States. Department of Energy. Yucca Mountain Project Office."  
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Modeling the Cathodic Region in Crevice Corrosion Under a Thin Electrolyte Film Including Particulates

Description: Crevice corrosion may be limited by the capacity of the external cathodic region to support anodic dissolution currents within the crevice. The analysis here focuses on behavior of metal surfaces covered by a thin ({approx}microns) layer of the electrolyte film including particulates. The particulates can affect the cathode current capacity (I{sub total}) by increasing the solution resistance (''volume effect'') and by decreasing the electrode area (''surface effect''). In addition, there can b… more
Date: March 14, 2006
Creator: Agarwal, A. S.; Landau, U.; Shan, X. & Payer, J. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Multiscale Thermohydrologic Model Supporting the Licence Application for the Yucca Mountain Repository

Description: The MultiScale ThermoHydrologic Model (MSTHM) predicts thermal-hydrologic (TH) conditions within emplacement tunnels (drifts) and in the adjoining host rock at Yucca Mountain, Nevada, which is the proposed site for a radioactive waste repository in the US. Because these predictions are used in the performance assessment of the Yucca Mountain repository, they must address the influence of variability and uncertainty of the engineered- and natural-system parameters that significantly influence th… more
Date: March 28, 2006
Creator: Buscheck, T.A>; Sun, Y. & Hao, Y.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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IN SITU INVESTIGATION OF THE PASSIVATION OF ALLOY C22 AND OF THE PASSIVE FILMS FORMED ON ALLOY C22 IN ACIDIC ELECTROLYTES AT ROOM TEMPERATURE AND AT 90 DEGREES C

Description: The passive films formed on Alloy C22 in several acidic solutions were investigated by a combination of five in situ techniques: cyclic polarization, electrochemical impedance spectroscopy, Mott-Schottky analyses, electrochemical quartz crystal microbalance measurements, and surface enhanced Raman spectroscopy. Similar tests were conducted on unalloyed samples of nickel, chromium and molybdenum, which are the main alloying elements of Alloy C22. The results of the tests conducted on nickel, chr… more
Date: March 11, 2006
Creator: M. Miyagusuku, S. Harrington, and T. M. Devine
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Natural Analoges as a Check of Predicted Drift Stability at Yucca Mountain, Nevada

Description: Calculations made by the U.S. Department of Energy's Yucca Mountain Project as part of the licensing of a proposed geologic repository (in southwestern Nevada) for the disposal of high-level radioactive waste, predict that emplacement tunnels will remain open with little collapse long after ground support has disintegrated. This conclusion includes the effects of anticipated seismic events. Natural analogues cannot provide a quantitative test of this conclusion, but they can provide a reasonabl… more
Date: March 10, 2006
Creator: Stuckless, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Uranium and Neptunium Desorption from Yucca Mountain Alluvium

Description: Uranium and neptunium were used as reactive tracers in long-term laboratory desorption studies using saturated alluvium collected from south of Yucca Mountain, Nevada. The objective of these long-term experiments is to make detailed observations of the desorption behavior of uranium and neptunium to provide Yucca Mountain with technical bases for a more realistic and potentially less conservative approach to predicting the transport of adsorbing radionuclides in the saturated alluvium. This pap… more
Date: March 16, 2006
Creator: Scism, C. D.; Reimus, P. W.; Ding, M. & Chipera, S. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Compositional and Structural Control on Anion Sorption Capability of Layered Double Hydroxides (LDHS)

Description: Layered double hydroxides (LDHs) have shown great promise as anion getters. In this paper, we demonstrate that the sorption capability of a LDH for a specific oxyanion can be greatly increased by appropriately manipulating material composition and structure. A large set of LDH materials have been synthesized with various combinations of metal cations, interlayer anions, and the molar ratios of divalent cation M(II) to trivalent cation M(III). The synthesized materials have then been tested syst… more
Date: March 16, 2006
Creator: Wang, Y. & Gao, H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Sensitivity Analysis of Hydrological Parameters in Modeling Flow and Transport in the Unsaturated Zone of Yucca Mountain

Description: The unsaturated fractured volcanic deposits at Yucca Mountain have been intensively investigated as a possible repository site for storing high-level radioactive waste. Field studies at the site have revealed that there exist large variabilities in hydrological parameters over the spatial domain of the mountain. This paper reports on a systematic analysis of hydrological parameters using the site-scale 3-D unsaturated zone (UZ) flow model. The objectives of the sensitivity analyses are to evalu… more
Date: March 21, 2006
Creator: Zhang, K.; Wu, Y.S. & Houseworth, J.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Considerations of the Role of the Cathodic Region in Localized Corrosion

Description: The ability of wetted cathodes of limited area to support localized corrosion sites on passive materials exposed to atmospheric conditions was studied computationally. The analysis pertains to conditions where metal surfaces are covered by thin layers of moisture in contrast to conditions of full immersion. The moisture may be a continuous layer or in patches with and without particulate on the surface. These conditions are of interest for the surfaces of the waste packages at the proposed Yucc… more
Date: March 17, 2006
Creator: Kelly, R.G.; Agarwal, A.; Cui, F.; Shan, X.; Landau, U. & Payer, J.H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Sorption Charecterization of Radonuclides on Clays in Yucca Mountain Alluvium

Description: Sorption of {sup 237}Np(V) and {sup 233}U(VI) was measured on clays separated from Yucca Mountain alluvium as a function of solution pH and aqueous actinide concentrations. The results indicate that sorption of U and Np on the separated clay fraction depends strongly on solution pH. Np sorption on clays increases slowly with increasing pH from 3 to 7. Above pH 7, Np sorption on clays increases rapidly up to a pH of about 10. On the other hand, U sorption on clays reaches it maximum at a pH of a… more
Date: March 17, 2006
Creator: Ding, M.; Reimus, P. W.; Chipera, S. & Scism, C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Localized Corrosion Behavior of Type 304SS with a Silica Layer Under Atmospheric Corrosion Environments

Description: The U.S. Department of Energy (DOE) has proposed a potential repository for spent nuclear fuel and high-level radioactive waste at the Yucca Mountain site in Nevada. [I] The temperature could be high on the waste packages, and it is possible that dripping water or humidity could interact with rock dust particulate to form a thin electrolyte layer with concentrated ionic species. Under these conditions, it is possible that highly corrosion-resistant alloys (CRAs) used as packages to dispose the … more
Date: March 13, 2006
Creator: Tada, E. & Frankel, G.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Uranium-Series Constraints on Subrepository Water Flow at Yucca Mountain, Nevada

Description: Mineral abundances and whole-rock chemical and uranium-series isotopic compositions were measured in unfractured and rubble core samples from borehole USWSD-9 in the same layers of variably zeolitized tuffs that underlie the proposed nuclear waste repository at Yucca Mountain, Nevada. Uranium concentrations and isotopic compositions also were measured in pore water from core samples from the same rock units and rock leachates representing loosely bound U adsorbed on mineral surfaces or containe… more
Date: March 10, 2006
Creator: Neymark, L. A.; Paces, J. B.; Chipera, S. J. & Vaniman, D. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Impact of Quaternary Climate on Seepage at Yucca Mountain, Nevada

Description: Uranium-series ages, oxygen-isotopic compositions, and uranium contents were determined in outer growth layers of opal and calcite from 0.5- to 3-centimeter-thick mineral coatings hosted by lithophysal cavities in the unsaturated zone at Yucca Mountain, Nevada, the proposed site of a permanent repository for high-level radioactive waste. Micrometer-scale growth layering in the minerals was imaged using a cathodoluminescence detector on a scanning electron microscope. Determinations of the chemi… more
Date: March 17, 2006
Creator: Whelan, J. F.; Paces, J. B.; Neymark, L. A.; Schmitt, A. K. & Grove, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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POTENTIAL SCALE DEPENDENCE OF EFFECTIVE MATRIX DIFFUSION COEFFICIENT

Description: It is well known that matrix diffusion (mass transfer between fractures and the rock matrix through molecular diffusion) can significantly retard solute transport processes in fractured rock, and therefore is important for analyzing a variety of problems, including geological disposal of nuclear waste. Matrix-diffusion-coefficient values measured from small rock samples in the laboratory are generally used for modeling field-scale solute transport in fractured rock. However, by compiling result… more
Date: March 13, 2006
Creator: Liu, H.; Zhou, Q. & Zhang, Y.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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LITHOSTRATIGRAPHY AND SHEAR-WAVE VELOCITY IN THE CRYSTALLIZED TOPOPAH SPRING TUFF, YUCCA MOUNTAIN, NEVADA

Description: Evaluation of the seismic response of the proposed spent nuclear fuel and high-level radioactive waste repository at Yucca Mountain, Nevada, is in part based on the seismic properties of the host rock, the 12.8-million-year-old Topopah Spring Tuff. Because of the processes that formed the tuff, the densely welded and crystallized part has three lithophysal and three nonlithophysal zones, and each zone has characteristic variations in lithostratigraphic features and structures of the rocks. Lith… more
Date: March 20, 2006
Creator: Buesch, David; Stokoe, Kenneth H. & Schuhen, Michael
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evidence for Gropun-Water Stratification Near Yucca Mountain, Nevada

Description: Major- and trace-element concentrations and strontium isotope ratios (strontium-87/strontium-86) in samples of ground water potentially can be useful in delineating flow paths in the complex ground-water system in the vicinity of Yucca Mountain, Nevada. Water samples were collected from boreholes to characterize the lateral and vertical variability in the composition of water in the saturated zone. Discrete sampling of water-producing intervals in the saturated zone includes isolating borehole … more
Date: March 24, 2006
Creator: Futa, K.; Marshall, B.D. & Peterman, Z.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Dosimetry Modeling for Predicting Radiolytic Production at the Spent Fuel-Water Interface

Description: The radiolysis of water in contact with spent nuclear fuel (SNF) will produce oxidants and reductants that can affect the dissolution of the fuel in a geologic disposal site. These products are created by initial radiolytic species which are a function of the type of radiation being emitted by the SNF, i.e. alpha, beta and/or gamma, as well as the energy of this radiation, the fuel grain size (and resulting surface-to-volume ratio) and the fuel-to-water ratio. These products interact with the s… more
Date: March 3, 2006
Creator: Miller, W. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A Framework for the Analysis of Localized Corrosion at the Proposed Yucca Mountain Repository

Description: The proposed Yucca Mountain Repository presents a familiar materials performance application that is regularly encountered in energy, transportation and other industries. The widely accepted approach to dealing with materials performance is to identify the performance requirements, to determine the operating conditions to which materials will be exposed and to select materials of construction that perform well in those conditions. A special feature of the proposed Repository is the extremely lo… more
Date: March 9, 2006
Creator: Payer, J. H.; Carroll, S. A.; Gdowski, G. E. & Rebak, R. B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

THE PENA BLANCA NATURAL ANALOGUE PERFORMANCE ASSESSMENT MODEL

Description: The Nopal I uranium mine in the Sierra Pena Blanca, Chihuahua, Mexico serves as a natural analogue to the Yucca Mountain repository. The Pena Blanca Natural Analogue Performance Assessment Model simulates the mobilization and transport of radionuclides that are released from the mine and transported to the saturated zone. the Pena Blanca Natural Analogue Model uses probabilistic simulations of hydrogeologic processes that are analogous to the processes that occur at the Yucca Mountain site. The… more
Date: March 10, 2006
Creator: Saulnier, G. J., Jr. & Statham, W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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METHODS FOR PORE WATER EXTRACTION FROM UNSATURATED ZONE TUFF, YUCCA MOUNTAIN, NEVADA

Description: Assessing the performance of the proposed high-level radioactive waste repository at Yucca Mountain, Nevada, requires an understanding of the chemistry of the water that moves through the host rock. The uniaxial compression method used to extract pore water from samples of tuffaceous borehole core was successful only for nonwelded tuff. An ultracentrifugation method was adopted to extract pore water from samples of the densely welded tuff of the proposed repository horizon. Tests were performed… more
Date: March 22, 2006
Creator: SCOFIELD, K.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Effect of Crevice Former on Corrosion Damage Propagation

Description: The objectives of this report are: (1) To determine the effect of the crevice former on the localized corrosion damage propagation; (2) FOCUS on post initiation stage, crevice propagation and arrest processes; (3) Determine the evolution of damage--severity, shape, location/distribution, damage profile; and (4) Model of crevice corrosion propagation, i.e. the evolution of the crevice corrosion damage profile.
Date: March 1, 2006
Creator: Payer, J. H.; Landau, U.; Shan, X. & Agarwal, A. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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