Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"high-level waste"”.
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The ramifications of a delay in the national high-level waste repository program
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1988.
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A method for the assessment of mutually exclusive scenarios in the risk assessment of high-level waste disposal in deep geologic formations
Thesis: Nuc. E., Massachusetts Institute of Technology, Department of Nuclear Engineering, 1984
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The effects of isotopic separation on closed nuclear fuel cycles
… of removing a long lived fission product from high level waste and recycling it into the transmuting reactor. This analysis shows that the removal of Cm-244 using the first strategy provides a marked benefit to several fuel cycle metrics. The second strategy benefits the long term radioactivity …
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Sensitivity analysis of nuclear fuel cycle transitions
… were the most influential to the final high level waste amount in the simulation. The one-at-a-time sensitivity analysis showed that varying transition year from 80 to 84 years increased the final depleted uranium amount by 1.13% and reduced the total idle reactor capacity by 10.36%. The …
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Canister design for deep borehole disposal of nuclear waste
… for the disposal of spent nuclear fuel and other high-level waste in deep borehole repositories using currently available and proven oil, gas, and geothermal drilling technology. The canister is suitable for disposal of various waste forms, such as fuel assemblies and vitrified waste. The design …
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Effect of atmospheric variations on subsurface flow and transport
… on subsurface flow and transport at the proposed high level waste repository at Yucca Mountain, Nevada. The conditions of subsurface transport were simulated with NUFT (Nonisothermal Unsaturated-Saturated Flow and Transport model) modeling software developed by the Lawrence Livermore National Labs …
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An evaluation of the feasibility of disposal of nuclear waste in very deep boreholes
… in the disposal of spent nuclear fuel and other high level waste. The primary focus is on the stability and solubility of waste species, waste forms, and canister materials in saline, anoxic water, which is the most severe potential downhole environment given the sparse data available. Pourbaix …
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Non-Neutron Transmutation of Spent Fuel
… LLFPs pose a significant obstacle to long-term high-level waste storage. Geologic repositories for nuclear waste must be functional for millions of years. This significant timescale contributes to the many technical and political challenges preventing the U.S. from closing the back end of the …
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Preliminary design and analysis for selected problems in deep borehole disposal of spent nuclear fuel
… interest in deep boreholes as a nuclear waste disposal option for all or part of the U.S. high-level waste inventory. Many design elements of deep borehole disposal have not yet been solidified, and there has not yet been a systematic analysis of the logistics necessary to implement deep …
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Physics and engineering aspects of South Africa's proposed dry storage facility for spent nuclear fuel
… and France are currently leading with the highest nuclear power generation in the world, generating 101 GWe and 63 GWe, respectively. Several countries such as China and the United Arab Emirates have committed to new nuclear build in order to increase their nuclear power generation …
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Nonproliferation issues in the nuclear energy future
… through geological isolation of spent fuel or high-level waste. 4. Focus on fuel cycles that do not yield separated plutonium during normal operation, and control over international cooperative R&D programs. 5. Implementation of suitable international fuel cycle architectures.
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Feasibility of lateral emplacement in very deep borehole disposal of high level nuclear waste
… Commission license application for the High Level Waste Repository at Yucca Mountain in Nevada. As the U.S. has focused exclusively on geologic disposal in shallow mined repositories for the past two decades, an examination of disposal alternatives will be necessary should the Yucca …
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Fluid Flow and Energy Transport in a High-Level Radioactive Waste Repository in Unsaturated Alluvium
… which might be suitable for disposing of high-level radioactive wastes. This thesis examines the possible effects of a strong heat source on temperature and the movement of water (vapor and liquid) in a repository located in unsaturated alluvium. The partial differential equations …
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Laboratory Strength Testing of Argillaceous Limestone Under Varying Saturation, Scale, Loading Rate, and Confinement Conditions
… solution for the long-term storage of nuclear waste in Canada. While site selection processes are currently underway for high-level waste storage, a low and intermediate waste storage DGR is planned for development at depth in Kincardine, Ontario. The DGR site is to be hosted in the Cobourg …
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Studies of Used Fuel Fluorination and U Extraction Based on Molten Salt Technology for Advanced Molten Salt Fuel Fabrication
… Zr, on the cathode, can be disposed of as low-level waste (LLW) or recycled back into the nuclear industry instead of being stored as high-level waste (HLW). The next technique was fluorination of UNF oxides using ZrF4. Using the same LiF-NaF-ZrF4 salt, uranium oxide (UO2), lanthanum oxide …
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Sensitivity analysis and optimization of the nuclear fuel cycle : a systematic approach
… fast reactors in order to reduce the amount of higher actinides, hence the longevity of radioactivity, in the materials destined to a geologic repository. The cost of the fast reactors, together with concerns about the proliferation of the technology of extraction of plutonium from used LWR fuel …
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The preparation and characterisation of highly selective adsorbents for fission product removal from acid solutions
… isotopes thereby preventing them from being wasted. This can save up to 30% of the natural uranium that is required each year for the fabrication of new nuclear fuel. A second aim is to reduce the volume of high-level radioactive waste. Along with the separation of uranium and plutonium there …
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Target Design and Optimizations for Spent Fuel Transmutation
… or stable isotopes. While long-term storage for high-level waste would still be necessary, transmuting the LLFPs can reduce the volume of waste material that needs to be stored. The objectives of this research are to explore the design of a proton transmutation facility, as well as to determine …
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The thermal conductivity of filler materials and permeability of a cement sealant for deep borehole repositories for high level nuclear waste
… repositories for spent nuclear fuel (SNF) and high level waste (HLW). They also noted that deep boreholes drilled into granite bedrock may be a viable option. Among the major concerns regarding this type of repository are the retention of radionuclides and the tolerance of heat from the …
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Remediation of spent oxalic acid nuclear decontamination solutions using ozone
… containing significant quantities of nuclear waste generated primarily from cold-war radiochemical separations. All of the tanks eventually must be closed. As part of decommissioning/closing the nuclear waste tanks, even residual quantities of the waste must be removed. Although most sludge …
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