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 74 for “"LWR"”.
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A long term perspective on the LWR fuel cycle
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1985.
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Assessment of high-burnup LWR fuel response to reactivity-initiated accidents
… higher discharge burnup of Light Water Reactor (LWR) fuel. A design basis accident, the Reactivity Initiated Accident (RIA), became a concern for further increase of burnup as simulated RIA tests revealed lower enthalpy threshold for fuel failure associated with fuel dispersal, which may …
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Assessment of Dancoff adjusted Wigner-Seitz cells for self-shielding LWR lattices
… cross sections for light water reactor (LWR) lattices. The WS approximation has been commonly used in lattice physics calculations for many decades regardless that it has been shown to underestimate k-eff for an infinite LWR lattice by several hundred pcm. The WS cell moderator thickness …
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Wettability of candidate Accident Tolerant Fuel (ATF) cladding materials in LWR conditions
… particularly under light water reactor (LWR) operating conditions. The surface wettability is particularly important, as it affects the dynamics of the boiling heat transfer process, and consequently, the critical heat flux (CHF) and rewetting temperatures, which are important thermal …
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Modeling and design of reload LWR cores for an ultra-long operating cycle
… cycle cores for existing Light Water Reactor (LWR) designs which respect current fuel burnup limits while considering the full range of practical design and economic considerations. The driving force behind this research was the desire to make nuclear power more economically competitive with …
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LWR fuel reactivity depletion verification using 2D full core MOC and flux map data
Experimental quantification of PWR fuel reactivity burnup decrement biases and uncertainties using in-core flux map data from operating power reactors has previously been conducted employing analytical methods to systematically determine experimental fuel reactivities that best match measured …
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Thermal analysis of uranium zirconium hydride fuel using a lead-bismuth gap at LWR operating temperatures
… for use in advanced light water reactors (LWRs) is uranium zirconium hydride (UZH), a fuel currently being used in the popular TRIGA research reactors. UZH is being considered because unlike the current fuel of choice, uranium dioxide, it is metal based and therefore better able to transfer …
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An automated computer controlled counting system for radionuclide analysis of corrosion products in LWR coolant systems
Thesis (Nucl. E)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1988.
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Integrated Technologies for the Decommissioning of LWR Primary Systems: Cutting, Chemical Decontamination, and Conditioning of Spent Ion Exchange Resins
L'abstract è presente nell'allegato / the abstract is in the attachment
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Non-destructively detecting spinodal decomposition at a distance towards developing gigahertz ultrasonics for in-vessel inspection
… critical components for light water reactors (LWRs) evolve over decades in service, losing ductility and toughness due to thermal and irradiation aging. Techniques to monitor their health cannot be easily applied in the field due to their destructive, expensive, or immobile nature. Thus, …
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Wood liquefaction in the presence of phenol with a weak acid catalyst and its potential for novolac type wood adhesives
… study of two typical liquefied wood resins (LWR) showed that the activation energies of liquefied wood resin were higher than conventional phenolic resins and close to that of a lignin-phenol-formaldehyde resin from another study. It was found that LWR followed an autocatalytic cure …
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Methodological advances in benefit transfer and hedonic analysis
… changes by adopting locally weighted regression (LWR) technique in an environmental valuation context, the second chapter combines the output from traditional hedonic regression and matching estimators and provides guidance on the choice of model with low risk of bias in housing market studies. …
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Investigation into obstacles to the implementation of the directed-self assembly of block copolymers
… edge roughness (LER) and line width roughness (LWR), and high defect densities. This work explores possible reasons for high LER, LWR, and defects using coarse-grained molecular dynamics and expands the library of BCP materials by synthesizing two new BCPs. Chapter 3 uses simulations to …
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Understanding the Impact of Nuclear Environment on the Hydrothermal Corrosion in SIC
… of their corrosion in Light Water Reactor (LWR) conditions is critical. SiC corrosion results in the formation of silica, which can then be rapidly dissolved in the LWR environment. LWR conditions are demanding on materials because they are subjected to irradiation, high pressure, high …
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Free Market on the Free Way
… of option pricing. A macroscopic physical model (LWR) is implemented by adding noise to the speed which accounts for unexpected events. We then proceed to provide a fair price for lanes in real time.</p>
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A low order acceleration scheme for solving the neutron transport equation
… iterations to solve large heterogeneous LWR reactor problems with high dominance ratio, and effective acceleration schemes are necessary to make MOC method practical. Various acceleration methods have been developed using low-order diffusion methods for approximating the scalar flux …
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A decision analysis framework for the U.S. nuclear fuel cycle
… three nuclear systems, the light-water reactor (LWR) once through fuel cycle, which represents the status quo, an advanced, traditional, plutonium-fed self sustaining fast reactor fuel cycle, and a fast reactor fuel cycle for which initial fast reactor cores are composed of enriched uranium …
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Economics of nuclear fuel cycles : option valuation and neutronics simulation of mixed oxide fuels
… possible ending for spent LightWater Reactor (LWR) fuel. Fast Reactors (FRs), which feed on transuranics (TRUs) extracted from LWR spent fuel, are seriously considered as a future technology. If it is cheaper to extract TRUs from spent MOX than from UOX, then the relative cost of a fuel cycle …
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Optimization of actinide transmutation in innovative lead-cooled fast reactors
… some MAs from the spent fuel of the conventional LWR fleet, and a minor a ctinide buumer reactor (MABR), devoted to bum mostly minor actinides and some plutonium both recycled from the burner and produced by the LWR fleet that should be integrated in a two-tier fuel cycle where most of the …
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Rethinking the light water reactor fuel cycle
… (TRU) in existing Light Water Reactors (LWR has been studied. Thorium based and fertile free fuels (FFF) were analyzed as the most attractive candidates for TRU burning in LWRs. Although both fuel types can destroy TRU at comparable rates (about 1150 kg/GWe-Year in FFF and up to 900 …
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