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 57 for “"Nuclear Materials"”.
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Human error contribution to nuclear materials-handling events
… events from the past ten years at commercial nuclear reactors with significant human error contributions in order to detail the contribution of human error to fuel-handling activities, emphasizing how latent conditions can directly contribute to events. In particular, procedural inaccuracies …
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Characterization of bending fatigue mini-specimens for nuclear materials
<p>"New materials with superior radiation and corrosion resistance are needed to improve the economy and performance of current nuclear reactors as well as future nuclear reactors. Measurement of mechanical properties of the material of equipment is required to estimate its safe operating life. …
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Radiation Effects on Thermal Properties of Advanced Nuclear Materials
… for the advancement of next-generation nuclear systems operating in high-flux neutron and gamma environments. Zirconium hydride (ZrH) and yttrium hydride (YH) have emerged as promising neutron moderating materials due to their exceptional hydrogen density leading to superior moderating …
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Autonomous detection and characterization of nuclear materials using co-robots
Radiation safety is the biggest concern of the nuclear industry, and co-robots are a crucial component to insuring that safety. Currently, radiation mapping data is typically gathered using hand held detectors or other detection systems requiring constant human interaction. This results in direct …
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A Safeguards Design Strategy for Domestic Nuclear Materials Processing Facilities.
<p>The outdated and oversized nuclear manufacturing complex within the United States requires its transformation into a smaller, safe, and secure enterprise. Health and safety risks, environmental concerns, and the end of the Cold War have all contributed to this necessity. The events of September …
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Calculating thermochemical equilibrium for multiphysics simulations of nuclear materials : development of yellowjacket gibbs energy minimiser
Nuclear fuels and structural materials are highly complex systems that are remarkably challenging to understand and model. Material behaviours are influenced by multiple physical phenomena such as mechanics, chemistry, heat and mass transport, etc. Moreover, lower scale phenomena inform and drive …
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Evaluation of material attractiveness to non-state actors of various nuclear materials in Thorium fuel cycles
Thorium-based fuel cycles for advanced nuclear reactors have been explored to utilize thorium resources in nations where uranium is scarce, increase fissile material utilization, and enhance proliferation resistance. As a stepping stone, thorium-based fuels have been paired with pressure tube heavy …
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CENTRIFUGALLY TENSIONED METASTABLE FLUID DETECTORS FOR DETECTION OF ALPHA, NEUTRON, AND OTHER SIGNATURES OF SPECIAL NUCLEAR MATERIALS IN NUCLEAR WASTE REPROCESSING FACILITIES
… (CTMFDs) as well as potential application to nuclear waste reprocessing facilities. The CTMFD operates by stretching a fluid below vacuum pressure using centrifugal mechanical tension to destabilize the fluid to the point where radiation interactions in the fluid can cause rapid nucleation and …
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Breaking the bottleneck in radiation materials science with transient grating spectroscopy
Nuclear power applications are characterized by harsh mechanical, chemical, thermal, and irradiation environments that present a challenge for the materials engineer. Nuclear materials research and development is a subject of managing constraints: a component must be proven to retain its integrity …
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A proof of principle nuclear forensics technique for determining ²³⁵U enrichment from UF₆ steel cylinders
Non-proliferation of nuclear materials depends on international regulations and the inspection tools available to safeguard inspectors for ensuring adherence to international treaties such as the Non-Proliferation Treaty (NPT). In collaboration with Dr. Michael P. Short (MIT) and the Mesoscale …
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The deterrence of nuclear terrorism through an attribution capability
The state of the world is such that the pace of nuclear weapons proliferation appears to be increasing. The growing number of nuclear states and amount of nuclear material available poses a great challenge to those that would attempt to keep nuclear weapons out of the hands of terrorists and other …
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X-ray absorption spectroscopy of actinide speciation in solid solutions
… for determining the molecular composition of materials in dilute quantities in solution and solid forms, was used to determine the speciation of actinides in various solid nuclear materials including nuclear fuel, environmental contaminants, and advanced nuclear materials. This data could then …
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Monte Carlo Method for Calorimetric NRF Cargo Screening
A number of fields in nuclear security require isotopic analysis and identification. Nuclear resonance fluorescence(NRF) has provided a non-intrusive isotope-sensitive measurement technique to detect special nuclear material in cargo [8], and has been proposed to be used as a verification technique …
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Multiple Monoenergetic Gamma Radiography (MMGR) using compact superconducting cyclotron
Smuggling of special nuclear materials (SNM) and nuclear devices through borders and ports of entry constitutes a major risk to global security. Reliable technologies are imperative for screening the flow of commerce for the presence of high-Z materials such as uranium and plutonium. This thesis …
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Using MELCOR with enhanced predictive capabilities via Thermochimica to model two severe accident cases of a generic BWR with Zry-2 and FeCrAl
… to simulate the severe accident progression of a nuclear power plant. The first objective was developing the capabilities in Thermochimica to handle the Ionic Two-sublattice Liquid Model in order to leverage the Thermodynamics of Advanced Fuels – International Database (TAF-ID). Using empirically …
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Risk Perceptions of Adults in the Town of Unicoi, Tennessee, Regarding the Possible Building of a Uranium Enrichment Plant.
… were associated with a history of working with nuclear materials [p=0.0476; OR=3.2]. Finally, risk perceptions were associated with residents' beliefs that the nuclear facility would affect their health [p=0.0001; OR=18.8]. These results are discussed in light of risk perception and …
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Evaluating strategies for countering nuclear-armed terrorist groups
… on the circumstances, a terrorist attack with nuclear or radiological weapons could cause more destruction and casualties than one with other types of WMD. Four strategies for improving U.S. capabilities to counter nuclear or radiological terrorism are often proposed: (1) to improve …
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India's nuclear power program : a study of India's unique approach to nuclear energy
… is in the middle of the biggest expansion of nuclear power in its history, adding 20 GWe in the next 14 years in the form of pressure water reactors and fast breeder reactors. At the same time, the United States is overturning decades of policy in order to resume the export of nuclear …
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Material flow simulation in a nuclear chemical process
At a nuclear fuel reprocessing plant the special nuclear materials (SNM) are received as constituents of spent fuel assemblies, are converted to liquid form, and undergo a series of chemical processes. Uncertainties in measurements of SNM at each stage of reprocessing limit the accuracy of simple …
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An ionization chamber for fission fragment analysis
… play a pivotal role in understanding the entire nuclear fission process, and their effects are widespread to all applications involving nuclear fission: reactor design and maintenance, waste removal, active and passive integration of nuclear materials, simulations, and the fundamental theories of …
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