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The Enhanced Plan for Features, Events, and Processes (FEPS) at Yucca Mountain

Description: A performance assessment is required to demonstrate compliance with the post-closure performance objectives for the Yucca Mountain Project (YMP), as stated in 10 CFR Part 63.1 13 (66 FR 55732, p. 55807). A performance assessment is defined in 10 CFR 63.2 (66 FR 55732, p. 55794) as an analysis that: (1) identifies the features, events, and processes (FEPs) that might affect the potential geologic repository; (2) examines the effects of those FEPs upon the performance of the potential geologic re… more
Date: March 25, 2002
Creator: Freeze, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Yucca Mountain Feature, Event, and Process (FEP) Analysis

Description: A Total System Performance Assessment (TSPA) model was developed for the U.S. Department of Energy (DOE) Yucca Mountain Project (YMP) to help demonstrate compliance with applicable postclosure regulatory standards and support the License Application (LA). Two important precursors to the development of the TSPA model were (1) the identification and screening of features, events, and processes (FEPs) that might affect the Yucca Mountain disposal system (i.e., FEP analysis), and (2) the formation … more
Date: January 18, 2005
Creator: Freeze, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Considerations in modeling groundwater inflow to underground respositories

Description: Groundwater in and around underground radioactive waste repositories has several potential effects on repository performance. Repository excavation produces conditions where the repository is underpressured relative to the surrounding host rock, resulting in groundwater inflow to the repository. The presence of groundwater has been shown to enhance gas generation from emplaced waste forms, which expedites repository pressurization. Repository pressurization results in an increased driving force… more
Date: August 1, 1996
Creator: Freeze, G. & Christian-Frear, T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

THE DEVELOPMENT OF THE YUCCA MOUNTAIN PROJECT FEATURE, EVENT, AND PROCESS (FEP) DATABASE

Description: A Total System Performance Assessment for Site Recommendation (TSPA-SR) has recently been completed (CRWMS M&O, 2000b) for the potential high-level waste repository at the Yucca Mountain site. The TSPA-SR is an integrated model of scenarios and processes relevant to the postclosure performance of the potential repository. The TSPA-SR scenarios and model components in turn include representations of all features, events, and processes (FEPs) identified as being relevant (i.e., screened in) f… more
Date: October 11, 2000
Creator: Freeze, G.; Swift, P. & Brodsky, N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A summary of methods for approximating salt creep and disposal room closure in numerical models of multiphase flow

Description: Eight alternative methods for approximating salt creep and disposal room closure in a multiphase flow model of the Waste Isolation Pilot Plant (WIPP) were implemented and evaluated: Three fixed-room geometries three porosity functions and two fluid-phase-salt methods. The pressure-time-porosity line interpolation method is the method used in current WIPP Performance Assessment calculations. The room closure approximation methods were calibrated against a series of room closure simulations perfo… more
Date: October 1, 1995
Creator: Freeze, G. A.; Larson, K. W. & Davies, P. B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Coupled Multiphase Flow and Closure Analysis of Repository Response to Waste-Generated Gas at the Waste Isolation Pilot Plant (WIPP)

Description: A long-term assessment of the Waste Isolation Pilot Plant (WIPP) repository performance must consider the impact of gas generation resulting from the corrosion and microbial degradation of the emplaced waste. A multiphase fluid flow code, TOUGH2/EOS8, was adapted to model the processes of gas generation, disposal room creep closure, and multiphase (brine and gas) fluid flow, as well as the coupling between the three processes. System response to gas generation was simulated with a single, isola… more
Date: October 1, 1995
Creator: Freeze, G. A.; Larson, K. W. & Davies, P. B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Modeling brine inflow to Room Q: A numerical investigation of flow mechanisms

Description: A hydrologic modeling study was performed to gain insight into the flow mechanisms around Room Q. A summary of hydrologic and structural data and of predictive fluid flow models from Room Q are provided. Six years of measured data are available from the time of excavation. No brine accumulation in Room Q was measured in the first two years following excavation. However, there is considerable uncertainty associated with this early-time data due to inadequate sealing of the room. Brine may have b… more
Date: April 1, 1997
Creator: Freeze, G. A.; Christian-Frear, T. L. & Webb, S. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A method of modeling time-dependent rock damage surrounding underground excavations in multiphase groundwater flow

Description: Underground excavations produce damaged zones surrounding the excavations which have disturbed hydrologic and geomechanical properties. Prediction of fluid flow in these zones must consider both the mechanical and fluid flow processes. Presented here is a methodology which utilizes a mechanical model to predict damage and disturbed rock zone (DRZ) development around the excavation and then uses the predictions to develop time-dependent DRZ porosity relationships. These relationships are then us… more
Date: July 1, 1997
Creator: Christian-Frear, T. & Freeze, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Using TOUGH2 to model the coupled effects of gas generation, repository consolidation, and multiphase brine and gas flow at the Waste Isolation Pilot Plant

Description: The Waste Isolation Pilot Plant (WIPP) is a US Department of Energy facility designed to demonstrate the safe underground disposal of transuranic waste. Following waste emplacement, each room will be backfilled with crushed salt. Due to deviatoric stress introduced by excavation, the walls of the waste disposal rooms in the repository will deform over time, consolidating waste containers and salt backfill, thereby decreasing the void volume of the repository. Long-term repository assessment mus… more
Date: April 1995
Creator: Freeze, G. A.; Larson, K. W.; Davies, P. B. & Webb, S. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Using a multiphase flow code to model the coupled effects of repository consolidation and multiphase brine and gas flow at the Waste Isolation Pilot Plant

Description: Long-term repository assessment must consider the processes of (1) gas generation, (2) room closure and expansions due to salt creep, and (3) multiphase (brine and gas) fluid flow, as well as the complex coupling between these three processes. The mechanical creep closure code SANCHO was used to simulate the closure of a single, perfectly sealed disposal room filled with water and backfill. SANCHO uses constitutive models to describe salt creep, waste consolidation, and backfill consolidation, … more
Date: October 1, 1995
Creator: Freeze, G. A.; Larson, K. W.; Davies, P. B. & Webb, S. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Summary of applications of TOUGH2 to the evaluation of multiphase flow processes at the WIPP

Description: The Waste Isolation Pilot Plant (WIPP) is a US Department of Energy (DOE) research and development facility for the underground disposal of transuranic waste in southeastern New Mexico. The WIPP repository is located 655 m below the land surface in the lower portion of the Salado Formation, which is comprised of beds of pure and impure halite with thin interbeds of anhydrite and related clay seams. The regional dip of the Salado Formation is approximately 1{degree} southeast in the vicinity of … more
Date: April 1, 1995
Creator: Webb, S. W.; Larson, K. W.; Freeze, G. A. & Christian-Frear, T. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Modeling the effect of excavation-disturbed-zone porosity increase on groundwater inflow to an underground repository

Description: The excavation of underground radioactive waste repositories produces conditions where the repository is underpressured relative to the surrounding host rock, resulting in groundwater inflow to the repository. Groundwater has been shown to enhance gas generation from emplaced waste forms, which in turn expedites repository pressurization. Repository pressurization from waste-generated gas results in an increased driving force for dissolved radionuclide movement away from the repository. Reposit… more
Date: August 1, 1998
Creator: Freeze, G.; Ruskauff, G.; Christian-Frear, T. & Webb, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Supplemental Performance Analyses for Igneous Activity and Human Intrusion at the Potential High-Level Nuclear Waste Repository at Yucca Mountain

Description: The U.S. Department of Energy (DOE) is considering the possible recommendation of a site at Yucca Mountain, Nevada, for the potential development of a geologic repository for the disposal of high-level radioactive waste and spent nuclear fuel. Consequences of hypothetical disruption of the Yucca Mountain site by igneous activity or human intrusion have been evaluated in the Yucca Mountain Science and Engineering Report (S&ER) (1), which presents technical information supporting the consider… more
Date: February 26, 2002
Creator: Swift, P.; Gaither, K.; Freeze, G.; McCord, J.; Kalinich, D.; Saulnier, G. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Feature, Event, and Process Screening and Scenario Development for the Yucca Mountain Total System Performance Assessment

Description: Scenario development has two primary purposes in the design and documentation of post-closure performance assessments in a regulatory setting. First, scenario development ensures a sufficiently comprehensive consideration of the possible future states of the system. Second, scenario development identifies the important scenarios that must be considered in quantitative analyses of the total system performance assessment (TSPA). Section 2.0 of this report describes the scenario development proces… more
Date: April 5, 1999
Creator: Barnard, R.; Barr, G.; Burch, P.; Freeze, G.; Rechard, R.; Schenker, A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Features, Events and Processes for the Used Fuel Disposition Campaign

Description: The Used Fuel Disposition (UFD) Campaign within DOE-NE is evaluating storage and disposal options for a range of waste forms and a range of geologic environments. To assess the potential performance of conceptual repository designs for the combinations of waste form and geologic environment, a master set of Features, Events, and Processes (FEPs) has been developed and evaluated. These FEPs are based on prior lists developed by the Yucca Mountain Project (YMP) and the international repository co… more
Date: December 15, 2010
Creator: Blink, J. A.; Greenberg, H. R.; Caporuscio, F. A.; Houseworth, J. E.; Freeze, G. A.; Mariner, P. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Update on Optical Design of Adaptive Optics System at Lick Observatory

Description: In 1999, we presented our plan to upgrade the adaptive optics (AO) system on the Lick Observatory Shane telescope (3m) from a prototype instrument pressed into field service to a facility instrument. This paper updates the progress of that plan and details several important improvements in the alignment and calibration of the AO bench. The paper also includes a discussion of the problems seen in the original design of the tip/tilt (t/t) sensor used in laser guide star mode, and how these proble… more
Date: July 31, 2001
Creator: Bauman, B. J.; Gavel, D. T.; Waltjen, K. E.; Freeze, G. J.; Hurd, R. L.; Gates, E. I. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Improved performance of the laser guide star adaptive optics system at Lick Observatory

Description: Results of experiments with the laser guide star adaptive optics system on the 3-meter Shane telescope at Lick Observatory have demonstrated a factor of 4 performance improvement over previous results. Stellar images recorded at a wavelength of 2 {micro}m were corrected to over 40% of the theoretical diffraction-limited peak intensity. For the previous two years, this sodium-layer laser guide star system has corrected stellar images at this wavelength to {approx}10% of the theoretical peak inte… more
Date: July 20, 1999
Creator: An, J. R.; Avicola, K.; Bauman, B. J.; Brase, J. M.; Campbell, E. W.; Carrano, C. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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