scholarly journals Containment of Low-Level Radioactive Waste at the DOE Saltstone Disposal Facility

2012 ◽  
Author(s):  
Jeff Jordan ◽  
Greg Flach
Keyword(s):  
South Carolina ◽  
Contaminant Transport ◽  
Transport Model ◽  
Time Frame ◽  
Savannah River ◽  
Disposal Facility ◽  
Long Time ◽  
Permanent Storage ◽  
Natural Barriers

As facilities look for permanent storage of toxic materials, they are forced to address the long-term impacts to the environment as well as any individuals living in affected area. As these materials are stored underground, modeling of the contaminant transport through the ground is an essential part of the evaluation. The contaminant transport model must address the long-term degradation of the containment system as well as any movement of the contaminant through the soil and into the groundwater. In order for disposal facilities to meet their performance objectives, engineered and natural barriers are relied upon. Engineered barriers include things like the design of the disposal unit, while natural barriers include things like the depth of soil between the disposal unit and the water table. The Saltstone Disposal Facility (SDF) at the Savannah River Site (SRS) in South Carolina is an example of a waste disposal unit that must be evaluated over a timeframe of thousands of years. The engineered and natural barriers for the SDF allow it to meet its performance obejective over the long time frame.

Technical Challenges Facing Regulators–Assessment of Long-Term Materials Performance

1987 ◽  
Vol 112 ◽  
Author(s):  
Kenneth W. Stephens
Keyword(s):  
Real Time ◽  
Waste Disposal ◽  
Time Frame ◽  
High Level Waste ◽  
Short Term ◽  
Long Time ◽  
Computer Codes ◽  
High Level ◽  
Term Data

AbstractFor a number of years, nuclear regulators have grappled with difficult questions such as: “How safe is safe enough?” Such issues take on new dimensions in the long time-frame of high-level waste disposal.Many of the challenges facing regulators involve assessment of long-term materials performance. Because real-time experiments cannot be conducted, it is necessary to rely extensively on modeling. This raises issues regarding the extent to which long-term extrapolations of short-term data are justified, the question of how closely models must represent reality to be trusted, and practical matters such as methods for validating unique computer codes.Issues such as these illustrate how regulators must make decisions in a climate of uncertainty. Methods used by non-technical disciplines to make decisions under uncertainty have been examined and offer solutions for regulators and licensees alike.

Role of Naturally Occurring Organic Matter on Thorium Transport in a Wetland

2002 ◽  
Vol 757 ◽  
Author(s):  
Daniel I. Kaplan ◽  
A. S. Knox
Keyword(s):  
Organic Matter ◽  
South Carolina ◽  
Transport Model ◽  
Indirect Evidence ◽  
Pilot Scale ◽  
Test Facility ◽  
Savannah River ◽  
Particle Size Fractionation ◽  
Enhanced Mobility

ABSTRACTA wetland located on the Savannah River Site in Aiken, South Carolina has become contaminated by a number of radionuclides as a result of operating a pilot-scale nuclear test facility. Sediment Th-232 concentration at the site exceed 700 mg/kg, whereas background concentrations are ∼7 mg/kg. The Th is relatively mobile, having moved >300-m since 1958 and greatly exceeding contaminant transport model predictions. Studies were initiated to determine the chemical cause for the enhanced transport of Th. Particle-size fractionation studies showed that colloids alone were not likely responsible for all of the enhanced transport of Th. Sediment sequential extraction data showed that >80% of the Th was associated with the sediment organic fraction. In an experiment in which varying soil amendments resulted in the release of dissolved organic carbon (DOC) to the aqueous phase, a significant correlation (r = 0.91; p ≤ 0.01, n = 8) was calculated between aqueous Th and DOC. Pore water Th partitioning to hydrophobic resins suggested that 33% of the aqueous Th was associated with organic matter. Together, these results provide indirect evidence support the notion that enhanced mobility of Th at the site may in part be due to the presence of Th-DOC complexes.

scholarly journals Archives Management and Permanent Storage of Documents

Atlanti ◽  
2015 ◽  
Vol 25 (1) ◽  
pp. 153-161
Author(s):  
Fikrie Berisha
Keyword(s):  
Entire Area ◽  
Digital Documents ◽  
Digital Network ◽  
Archival Documents ◽  
Long Time ◽  
Permanent Storage ◽  
Digital Document ◽  
The Moment ◽  
Selection Of

Modern digital archives are modern archives which in big computer devices (servers), preserve archived original document overlooking the moment is produced. Archives in Kosovo assessment of archival documents make in two directions. First; selection of classical documents (on paper) with the value to be transformed into digital documents, and second; selection of contemporary documents produced by institutions of computer and internet era. Management of these digital documents requires procedures and professional standards for its storage and processing by the archive, in order to be ready to serve researchers and interested parties. Access to digital documents should be fast, simple procedures, providing documentation from the penetration of ‘hackers’ and people badly intention. To fulfil its mission digital document should ensure and complement the appearance of the original document. Since the user does not have the option of intervention and change in the document. Should work in protect emblem, which protects the entire area of the document in the form of molten seal, which also shows the ownership of certain archive. Safety documentation and document base by external users will be able to organize, deposit and stored at three levels: Server (1) be stored (saved) archival documents for use by the applicant; Server (2) stored data of the first and simultaneously updates added by continuous processing of new documents; and Server (3) is not accessible from outside through digital network, but stored all digital archive documentation and from here there should be no often exit. In Server 3 only entered document and stored as recent bank. From there, the document will be drawn only if it is missing or damaged document on server 1 and 2.Thus, through this categorization could be provided for long time electronic documents (digital), until to new modern inventions of modern digitalization technology that would ensure the preservation of documents for the ‘real’ long-term or permanent time.

Near-Field Performance Assessment for the Saltstone Disposal Facility

1992 ◽  
Vol 294 ◽  
Author(s):  
Roger R. Seitz ◽  
John C. Walton ◽  
Craig A. Dicke ◽  
James R. Cook
Keyword(s):  
South Carolina ◽  
Performance Assessment ◽  
Near Field ◽  
Field Performance ◽  
Lessons Learned ◽  
Savannah River ◽  
Flow And Transport ◽  
Design Considerations ◽  
Disposal Facility ◽  
River Site

ABSTRACTA near-field performance assessment (PA) was conducted for the Saltstone Disposal Facility (SDF) at the Savannah River Site in South Carolina. The analysis was conducted in four parts: general screening calculations, degradation calculations, and flow and transport through the fractured and nonfractured facility. Modeling approaches and example sensitivity analysis results from the simulations of the fractured facility are discussed. Design considerations that may not be apparent without addressing flow and transport through fractures and lessons learned during the process are also presented.

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