scholarly journals Implementation of Localized Corrosion in the Performance Assessment Model for Yucca Mountain

2008 ◽  
Vol 163 (1) ◽  
pp. 92-100
Author(s):  
S. David Sevougian ◽  
Vivek Jain ◽  
Robert J. MacKinnon ◽  
Patrick D. Mattie ◽  
Kevin G. Mon ◽  
...  
Keyword(s):  
Performance Assessment ◽  
Yucca Mountain ◽  
Assessment Model ◽  
Localized Corrosion

Performance Assessment Modeling of a Multi-Purpose Container

1993 ◽  
Vol 333 ◽  
Author(s):  
Daniel B. Bullen
Keyword(s):  
Heat Transfer ◽  
Performance Assessment ◽  
Power Density ◽  
Environmental Conditions ◽  
Near Field ◽  
Yucca Mountain ◽  
Assessment Model ◽  
Mountain Site ◽  
Recent Developments ◽  
Term Performance

ABSTRACTA mathematical model to predict the cumulative failure distribution for the engineered barrier system employed in a deep geologic disposal facility as a function of container design and near-field environmental conditions has been developed. The model employs Weibull and exponential distributions to describe cumulative container failures as a function of time. Parameter values employed in the model are based upon simple, time-dependent, mechanistic models and relevant corrosion data, which describe failure of individual components of the container as a function of environmental conditions.Recent developments in container design for the Yucca Mountain site center on the possible deployment of Multi-Purpose Containers (MPC). These containers will be designed and constructed to serve as transport casks, interim storage containers, and disposal containers. The current container performance assessment model is applied to evaluate the long-term performance of various MPC designs under the areal power density and heat transfer regimes expected in the Yucca Mountain environment. This model has previously been employed to describe the performance of the container as one part of a risk-based performance assessment of the Yucca Mountain site.The relative importance of container design, areal power density, and dominant heat transfer mode on predicted MPC performance is demonstrated through comparison of the cumulative container failure distributions for each MPC design when exposed to expected Yucca Mountain environmental conditions.

Effects of Uncertainty and Spatial Variability on Seepage Into Drifts in the Yucca Mountain Total System Performance Assessment Model

2001 ◽  
Author(s):  
Donald A. Kalinich ◽  
Michael L. Wilson
Keyword(s):  
Spatial Variability ◽  
Performance Assessment ◽  
System Performance ◽  
Seepage Flow ◽  
Yucca Mountain ◽  
Assessment Model ◽  
Base Case ◽  
Total System ◽  
Performance Uncertainty

Abstract Seepage into the repository drifts is an important factor in total-system performance. Uncertainty and spatial variability are considered in the seepage calculations. The base-case results show 13.6% of the waste packages (WPs) have seepage. For 5th percentile uncertainty, 4.5% of the WPs have seepage and the seepage flow decreased by a factor of 2. For 95th percentile uncertainty, 21.5% of the WPs have seepage and the seepage flow increased by a factor of 2. When seepage was forced on 100% of the WPs the seepage flow increased by a factor of 3.

scholarly journals Evaluation of the Corrosivity of Dust Deposited on Waste Packages at Yucca Mountain, Nevada

2006 ◽  
Vol 932 ◽  
Author(s):  
Charles Bryan ◽  
Russell Jarek ◽  
Thomas Wolery ◽  
David Shields ◽  
Mark Sutton ◽  
...  
Keyword(s):  
Corrosion Product ◽  
Experimental Studies ◽  
Yucca Mountain ◽  
Localized Corrosion ◽  
Small Droplet ◽  
Waste Package ◽  
Physical Isolation ◽  
Salt Minerals ◽  
Dry Out ◽  
Diffusive Gradients

ABSTRACTPotentially corrosive brines can form during post-closure by deliquescence of salt minerals in dust deposited on the surface of waste packages at Yucca Mountain during operations and the pre-closure ventilation period. Although thermodynamic modeling and experimental studies of brine deliquescence indicates that brines are likely to form, they will be nitrate-rich and noncorrosive. Processes that modify the brines following deliquescence are beneficial with respect to inhibition of corrosion. For example, acid degassing (HCl, HNO3) could dry out brines, but kinetic limitations are likely to limit the effect to increasing their passivity by raising the pH and increasing the NO3/Cl ratio.Predicted dust quantities and maximum brine volumes on the waste package surface are small, and physical isolation of salt minerals in the dust may inhibit formation of eutectic brines and decrease brine volumes. If brines do contact the WP surface, small droplet volumes and layer thicknesses do not support development of diffusive gradients necessary for formation on separate anodic-cathodic zones required for localized corrosion. Finally, should localized corrosion initiate, corrosion product buildup will stifle corrosion, by limiting oxygen access to the metal surface, by capillary retention of brine in corrosion product porosity, or by consumption of brine components (Cl−).

NNWSI Performance Assessment Considerations

1983 ◽  
Vol 26 ◽  
Author(s):  
L. D. Tyler ◽  
R. R. Peters ◽  
N. K. Hayden ◽  
J. K. Johnstone ◽  
S. Sinnock
Keyword(s):  
Performance Assessment ◽  
Nuclear Waste ◽  
Yucca Mountain ◽  
Department Of Energy ◽  
Nuclear Waste Repository ◽  
Nuclear Waste Storage ◽  
Human Environment ◽  
Assessment Task ◽  
Waste Storage ◽  
A Site

ABSTRACTThe Nevada Nuclear Waste Storage Investigations (NNWSI) project includes a Performance Assessment task to evaluate the containment and isolation potential for a nuclear waste repository at Yucca Mountain in southern Nevada. This task includes calculations of the rates and concentrations at which radionuclides might be released and transported from the repository and will predict their consequences if they enter the human environment. Among the major tasks required for these calculations will be the development of models for water flow and nuclide transport under unsaturated conditions and in fractured hard rock. The program must also quantify the uncertainties associated with the results of the calculations. The performance assessment will provide evaluations needed for making major decisions as the U. S. Department of Energy seeks a site for a repository. An evaluation will be part of the environmental assessments prepared to accompany the potential nomination of the site. If the Yucca mountain site is selected for characterization and development as a repository, the assessments will be required for an environmental impact statement, a safety analysis report, and other documents.This program has been divided into five tasks. Collectively they will provide the performance assessments needed for the NNWSI Project.

scholarly journals Project Management Performance Assessment in the Non-Profit Sector

2019 ◽  
Vol 5 ◽  
Author(s):  
John Lannon
Keyword(s):  
Project Management ◽  
Quality Management ◽  
Performance Assessment ◽  
Performance Management ◽  
Management Practices ◽  
Assessment Model ◽  
Management Systems ◽  
Management Performance ◽  
Non Profit ◽  
For Profit

As the non-profit sector becomes increasingly dependent on projects to achieve its strategic goals, the use of formal project management processes can help to demonstrate to stakeholders that an organisation is taking steps to improve its performance. However the adoption of processes drawn from the for-profit sector does not always yield the desired results. In particular existing performance management systems and quality management systems are unsuitable for the implementation, measurement, and improvement of project management practices in the sector. A new model is therefore proposed for non-profit project management performance assessment. This is based on a conceptual analysis of the European Foundation for Quality Management (EFQM) business excellence model, a project management performance assessment model used primarily in for-profit environments, and an assessment of criteria particular to non-profit organisations. The model is multi-dimensional, flexible, and accounts for multiple stakeholder views. After using it, non-profit organisations can reflect on their performance, create an improvement plan, and use the model again to test their progress.

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