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Used Fuel Disposition Campaign (UFDC) Generic Disposal System Analysis (GDSA).
Abstract not provided.
ROLE OF HUMAN INTRUSION IN DECISION-MAKING FOR RADIOACTIVE WASTE DISPOSAL - RESULTS OF THE IAEA HIDRA PROJECT
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MERCURY SPECIATION IN SAVANNAH RIVER SITE HIGH-LEVEL WASTE:DETERMINATION AND IMPLICATIONS FOR WASTE HANDLING AND DISPOSAL
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Integrating Management of Spent Nuclear Fuel from Generation to Disposal in the United States.
Abstract not provided.
Evapotranspiration Within the Groundwater Model Domain of the Tuba City, Arizona, Disposal Site Interim Report
The revised groundwater model includes estimates of evapotranspiration (ET). The types of vegetation and the influences of ET on groundwater hydrology vary within the model domain. Some plant species within the model domain, classified as phreatophytes, survive by extracting groundwater. ET within these plant communities can result in a net discharge of groundwater if ET exceeds precipitation. Other upland desert plants within the model domain survive on meteoric water, potentially limiting groundwater recharge if ET is equivalent to precipitation. For all plant communities within the model domain, excessive livestock grazing or other disturbances can tip the balance to a net groundwater recharge. This task characterized and mapped vegetation within the groundwater model domain at the Tuba City, Arizona, Site, and then applied a remote sensing algorithm to estimate ET for each vegetation type. The task was designed to address five objectives: 1. Characterize and delineate different vegetation or ET zones within the groundwater model domain, focusing on the separation of plant communities with phreatophytes that survive by tapping groundwater and upland plant communities that are dependent on precipitation. 2. Refine a remote sensing method, developed to estimate ET at the Monument Valley site, for application at the Tuba City site. 3. Estimate recent seasonal and annual ET for all vegetation zones, separating phreatophytic and upland plant communities within the Tuba City groundwater model domain. 4. For selected vegetation zones, estimate ET that might be achieved given a scenario of limited livestock grazing. 5. Analyze uncertainty of ET estimates for each vegetation zone and for the entire groundwater model domain.
Evapotranspiration Dynamics and Effects on Groundwater Recharge and Discharge at the Tuba City, Arizona, Disposal Site
The U.S. Department of Energy Office of Legacy Management is evaluating groundwater flow and contaminant transport at a former uranium mill site near Tuba City, Arizona. We estimated effects of temporal and spatial variability in evapotranspiration (ET) on recharge and discharge within a groundwater model domain (GMD) as part of this evaluation. We used remote sensing algorithms and precipitation (PPT) data to estimate ET and the ET/PPT ratios within the 3531 hectare GMD. For the period from 2000 to 2012, ET and PPT were nearly balanced (129 millimeters per year [mm yr -1 ] and 130 mm yr -1 , respectively; ET/PPT = 0.99). However, seasonal and annual variability in ET and PPT were out of phase, and spatial variability in vegetation differentiated discharge and recharge areas within the GMD. Half of ET occurred during spring and early summer when PPT was low, and about 70% of PPT arriving in fall and winter was discharged as plant transpiration in the spring and summer period. Vegetation type and health had a significant effect on the site water balance. Plant cover and ET were significantly higher (1) during years of lighter compared to years of heavier grazing pressure, and (2) on rangeland protected from grazing compared to rangeland grazed by livestock. Heavy grazing increased groundwater recharge (PPT > ET over the 13-year period). Groundwater discharge (ET > PPT over the 13-year period) was highest in riparian phreatophyte communities but insignificant in desert phreatophyte communities impacted by heavy grazing. Grazing management in desert upland and phreatophyte communities may result in reduced groundwater recharge, increased groundwater discharge, and could be used to influence local groundwater flow.
Geomechanics Issues Regarding Heat-Generating Waste Disposal in Salt.
Abstract not provided.
Managing Spent Nuclear Fuel from Generation to Disposal: Integration of the Back-End of the Nuclear Fuel Cycle.
Abstract not provided.
Managing Spent Nuclear Fuel from Generation to Disposal: Integration of the Back-End of the Nuclear Fuel Cycle.
Abstract not provided.
UFD ? Disposal in Argillite R&D: Geochemical Modeling Activities of Barrier Material Interactions.
Abstract not provided.
Generic Disposal System Analysis (GDSA): Development Coupling Application and Integration.
Abstract not provided.
Thermal-Mechanical Data for Argillite Disposal Systems: Beyond Standard Density Functional Theory.
Abstract not provided.
Key Points Relevant to the Development of an Integrated Approach to Storage Transportation and Disposal of Commercial Spent Nuclear Fuel in the United States.
Abstract not provided.