Nuclear Engineering
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[20130131] Quantification and propagation of nuclear data uncertainties
The use of several uncertainty quantification and propagation methodologies is investigated in the context of the prompt fission neutron spectrum (PFNS) uncertainties and its impact on critical reactor assemblies. First, ... 
[20130130] Behavior and measurement of distributed sources in a shielding matrix using gamma spectroscopy
As part of its mission, the Department of Energy generates transuranic waste materials. Some of these wastes are present in large waste containers. The accurate assay of these waste materials in large containers poses ... 
[20130130] Eigenfunction expansion of the time and spacedependent neutron survival probability equation
Owing to their inherent complexity, stochastic neutron transport problems are often examined by either using highly simplified models to make solutions more accessible, or at the cost of significant computational effort ... 
[20130130] A momentpreserving singleevent Monte Carlo model of electron and positron energyloss straggling
Analog simulation of energy straggling of electrons and positrons is computationally impractical because of longrange Coulomb forces resulting in highly peaked cross sections about small energylosses and extremely small ... 
[20120705] Dual neutral particle induced transmutation
Although nuclear transmutation methods have been around for decades, they all focus solely on neutron induced reactions. Recent novel concepts have sought to use neutrons as well as photons for active interrogation of cargo ... 
[20120705] From the lab to the real world : sources of error in UF6 gas enrichment monitoring
Safeguarding uranium enrichment facilities is a serious concern for the International Atomic Energy Agency (IAEA). Safeguards methods have changed over the years, most recently switching to an improved safeguards model ... 
[20111011] Characterizations of plutonium nitrate solutions for criticality calculations
In the modeling of plutonium nitrate systems for criticality calculations, the chemical formula is usually assumed to be Pu(N03)4 (where plutonium is in the +4 valence state). However in a unique situation of chemistry, ... 
[20110702] Swirling jets for the mitigation of hot spots and thermal Sstratification in the VHTR lower plenum
The literature indicates that a prismaticcore very high temperature reactor can experience thermal stratification and hot spot issues in the lower plenum (LP). This research hypothesizes that the complex thermalhydraulic ... 
[20100909] An arbitrary curvilinear coordinate particle in cell method
A new approach to the kinetic simulation of plasmas in complex geometries, based on the ParticleinCell (PIC) simulation method, is explored. In this method, called the Arbitrary Curvilinear Coordinate PIC (ACCPIC) ... 
[20100903] Novel techniques for the detection and localization of attenuated gammaray sources
The use of cylindrical solidcrystal detectors for the detection and removal of gammaemitting sources has become a common practice for the cleanup of radiological contaminated sites. It is often difficult to determine ... 
[20100625] Nonlinear acceleration methods for evenparity neutron transport
Convergence acceleration methods for evenparity transport are being developed that have the potential to speed up transport calculations and provide a natural avenue for an implicitly coupled multiphysics code. An ... 
[20100624] Diagnostics of source distribution and particle population in Monte Carlo source iteration methods
This thesis is concerned with the development of meshinputfree diagnostics for the determination of the iteration at which the source distribution of a Monte Carlo simulation has reached a stationary state, as well as ... 
[20100624] Development of sensitivity analysis with the use of TSUNAMI3D sensitivity coefficients for benchmark uncertainty analysis
The uncertainty of a critical benchmark experiment is a very important result. This value tells how well each parameter in the system is known and therefore how well the multiplication factor is known. The current method ... 
[20100209] Criticality alarm system design guide with accompanying alarm system development for the Radiochemical Processing Laboratory in Richland, Washington
A detailed instructional manual was created to guide criticality safety engineers through the process of designing a criticality alarm system (CAS) for Department of Energy (DOE) hazard class 1 and 2 facilities. Regulatory ... 
[20100209] A prototype Compton imager : simulations, measurements and algorithm development
Compton imaging is a gamma ray imaging technique that has possible applications in the nuclear and medical industries. Compton imaging can localize the origin of a scattered gamma ray, to a cone, using a minimum of two ...