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in publisher: "INTERA, Inc., Las Vegas, NV United States"

open access

Review and selection of unsaturated flow models

Under the US Department of Energy (DOE), the Civilian Radioactive Waste Management System Management and Operating Contractor (CRWMS M&O) has the responsibility to review, evaluate, and document existing computer ground-water flow models; to conduct performance assessments; and to develop performance assessment models, where necessary. In the area of scientific modeling, the M&O CRWMS has the following responsibilities: To provide overall management and integration of modeling activities. To pr… more

Date: September 10, 1993

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Effects of Exploratory Studies Facility construction water on radionuclide release

ESF is a planned underground laboratory to conduct subsurface explortion and testing in support of site suitability determination and license application for a potential high-level nuclear waste repository at Yucca Mountain. ESF design includes a 7.6 m dia, 7.8 km long tunnel loop of two main access ramps from the surface down to a main drift along the conceptual repository horizon in a fractured, welded tuff (Topopah Spring member of Paintbrush Tuff). The use of water during excavation of the … more

Date: August 1, 1996

Creator: Houseworth, J.E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Mathematical models for diffusive mass transfer from waste package container with multiple perforations

A robust engineered barrier system (EBS) is employed in the current design concept for the potential high-level nuclear waste repository at Yucca Mountain, Nevada, US. The primary component of the EBS is a multi-barrier waste package container. Simplifying the geometry of the cylindrical waste package container and the underlying invert into the equivalent spherical configuration, mathematical models are developed for steady-state and transient diffusive releases from the failed waste container… more

Date: December 31, 1996

Creator: Lee, J. H.; Andrews, R. W. & Chambre, P. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Parametric analysis of a 1-D infiltration model for Yucca Mountain

Hydrogeological properties of the formations at Yucca Mountain have been previously characterized by log-normal distributions. Different realizations of the randomly described formation may assume different hydrological behaviors, and different property variations may exert influences of different significance levels. This study presents a parametric sensitivity and uncertainty analyses of steady-state infiltration through a representative column of the formations at Yucca Mountain.

Date: August 1996

Creator: Xiang, Yangyong & Mishra, S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Important Parameters in the Performance of a Potential Repository at Yucca Mountain (TSPA-1995)

A total system performance assessment (TSPA) was conducted to determine how a potential repository at Yucca Mountain would behave. Using the results of this TSPA, regression was done to determine which parameters had the most important effect on the repository performance. These results were consistent with the current conceptual understanding of the repository.

Date: June 1, 1996

Creator: Atkins, Joel E.; Sevougian, S. David; Lee, Joon H.; Andrews, Robert W. & McNeish, Jerry A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Total System Performance Assessment, 1993: An evaluation of the potential Yucca Mountain repository

Total System Performance Assessments are an important component in the evaluation of the suitability of Yucca Mountain, Nevada as a potential site for a mined geologic repository for the permanent disposal of high-level radioactive wastes in the United States. The Total System Performance Assessments are conducted iteratively during site characterization to identify issues which should be addressed by the characterization and design activities as well as providing input to regulatory/licensing … more

Date: March 1, 1994

Creator: Andrews, R.W.; Dale, T.F. & McNeish, J.A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Total System Performance Predictions (TSPA-1995) for the Potential High-Level Waste Repository at Yucca Mountain

The management and operating contractor for the potential high-level nuclear waste repository at Yucca Mountain, Nevada, has been recently completed a new performance assessment of the ability of the repository to isolate and contain nuclear waste for long time periods (up to 1,000,000 years). Sensitivity analyses determine the most important physical parameters and processes, using the most current information and models.

Date: June 1, 1996

Creator: Sevougian, S. David; Andrews, Robert W. & McNeish, Jerry A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Testing of abstractions for total system performance assessment

Total system performance assessment requires the explicit quantification of all the relevant processes and process interactions. However, process level descriptions of all the processes required for the evaluation of the total system performance is computationally impractical, thus requiring the abstraction of these process level models. In this paper the unsaturated flow abstraction methodology developed for the current iteration of the total system performance assessment for the potential rep… more

Date: June 1, 1996

Creator: Vallikat, V.; Mishra, S.; Xiang, Y. & Sevougian, D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Sensitivity of the engineered barrier system (EBS) release rate to alternative conceptual models of advective release from waste packages under dripping fractures

The first model assumed that dripping water directly contacts the waste form inside the ``failed`` waste package and radionuclides are released from the EBS by advection. The second model assumed that dripping water is diverted around the package (because of corrosion products plugging the perforations), thereby being prevented from directly contacting the waste form. In the second model, radionuclides were assumed to diffuse through the perforations, and, once outside the waste package, to be … more

Date: September 1, 1996

Creator: Lee, J. H.; Atkins, J. E.; McNeish, J. A. & Vallikat, V.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Impacts of cathodic protection on waste package performance

The current design concept for a multi-barrier waste container for the potential repository at Yucca Mountain, Nevada, calls for an outer barrier of 100 mm thick corrosion-allowance material (CAM) (carbon steel) and an inner barrier of 20 mm thick corrosion-resistant material (CRM) (Alloy 825). Fulfillment of the NRC subsystem requirements (10 CFR 60.113) of substantially complete containment and controlled release of radionuclides from the engineered barrier system (EBS) will rely mostly upon … more

Date: June 1, 1996

Creator: Atkins, J. E.; Lee, J. H. & Andrews, R. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Stochastic simulation of pitting degradation of multi-barrier waste container in the potential repository at Yucca Mountain

A detailed stochastic waste package degradation simulation model was developed incorporating the humid-air and aqueous general and pitting corrosion models for the carbon steel corrosion-allowance outer barrier and aqueous pitting corrosion model for the Alloy 825 corrosion-resistant inner barrier. The uncertainties in the individual corrosion models were also incorporated to capture the variability in the corrosion degradation among waste packages and among pits in the same waste package. With… more

Date: December 31, 1995

Creator: Lee, J. H.; Atkins, J. E. & Andrews, R. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Preliminary evaluation of predicted peak release rates from the engineered barrier system for a potential repository at Yucca Mountain, Nevada

Any potential repository for the ultimate disposal of the nation`s high-level radioactive wastes is subject to meeting post-closure regulatory requirements as specified by the NRC. Three NRC sub-system performance measures are relevant to the evaluation of the Yucca Mountain site and possible engineered barriers. These performance requirements are specified in 10 CFR 60. These include the substantially complete containment requirement, the engineered barrier system (EBS) release requirement, an… more

Date: December 31, 1995

Creator: Andrews, R. W.; McNeish, J. A. & Lee, J. H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A comparative application of the Repository Integration Program (RIP) to Total System Performance Assessment, 1991

During Fiscal Year (FY) 1991 and FY 1992, Sandia National Laboratory and Battelle Pacific Northwest Laboratory were assigned the responsibility to generate initial Total System Performance Assessments (TSPAs) of the Yucca Mountain site. The analyses performed by these organizations (called TSPA-1991) are reported in Barnard et al(1992) and Eslinger et al. (1993). During this same time period, Golder Associates Inc. was assigned the task of generating a model capable of analyzing the total syste… more

Date: July 16, 1993

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Implementation of runtime visualization for TOUGH2

This paper is a summary of the work conducted for the TOUGH2 runtime visualization in support of the modeling of the unsaturated flow regime at Yucca Mountain.

Date: June 1, 1996

Creator: Yang, H.X. & Mishra, S.

Item Type: Article

Partner: UNT Libraries Government Documents Department