Andrew Osborne
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View article: Simulations of muon imaging with the LANL GMT detector for spent nuclear fuel cask content verification
Simulations of muon imaging with the LANL GMT detector for spent nuclear fuel cask content verification Open
Atmospheric muons are typically high energy, highly penetrating charged particles. They interact with matter primarily through multiple Coulomb scatterings. Muon scattering intensities can be used to characterize the density and atomic num…
View article: Upsampling Monte Carlo Reactor Simulation Tallies in Depleted Sodium-Cooled Fast Reactor Assemblies Using a Convolutional Neural Network
Upsampling Monte Carlo Reactor Simulation Tallies in Depleted Sodium-Cooled Fast Reactor Assemblies Using a Convolutional Neural Network Open
The computational demand of neutron Monte Carlo transport simulations can increase rapidly with the spatial and energy resolution of tallied physical quantities. Convolutional neural networks have been used to increase the resolution of Mo…
View article: Upsampling Monte Carlo reactor simulation tallies in depleted LWR assemblies fueled with LEU and HALEU using a convolutional neural network
Upsampling Monte Carlo reactor simulation tallies in depleted LWR assemblies fueled with LEU and HALEU using a convolutional neural network Open
Simulating nuclear reactor cores at the highest achievable spatial and energy resolution is critical in modeling these systems accurately. Increasing the resolution, however, can dramatically increase the memory and central processing unit…
View article: Simulation and validation studies of a large drift tube muon tracker
Simulation and validation studies of a large drift tube muon tracker Open
Cosmic ray muons are massive, charged particles created from high energy cosmic rays colliding with atomic nuclei in Earth’s atmosphere. Because of their high momenta and weak interaction, these muons can penetrate through large thicknesse…
View article: Publisher’s Note: “Simulation and validation studies of a large drift tube muon tracker” [Rev. Sci. Instrum. 94, 083301 (2023)]
Publisher’s Note: “Simulation and validation studies of a large drift tube muon tracker” [Rev. Sci. Instrum. 94, 083301 (2023)] Open
View article: Upsampling Monte Carlo neutron transport simulation tallies using a convolutional neural network
Upsampling Monte Carlo neutron transport simulation tallies using a convolutional neural network Open
The physical quantities calculated by nuclear reactor Monte Carlo simulations are typically recorded on a grid of two or three spatial dimensions and one dimension of neutron energy. Because of this, increasing the resolution of the calcul…
View article: Data: Upsamling Monte Carlo Neutron Transport Simulation Tallies Using a Convolutional Neural Network
Data: Upsamling Monte Carlo Neutron Transport Simulation Tallies Using a Convolutional Neural Network Open
This repository contains: openmc-data-XXXX.tar.gz - Training Data generated with the OpenMC Monte Carlo code representing neutron flux tallies in 4,400 unique light water reactor fuel assemblies in HDF5 format. Training samples consist of …
View article: Data: Upsamling Monte Carlo Neutron Transport Simulation Tallies Using a Convolutional Neural Network
Data: Upsamling Monte Carlo Neutron Transport Simulation Tallies Using a Convolutional Neural Network Open
This repository contains: openmc-data-XXXX.tar.gz - Training Data generated with the OpenMC Monte Carlo code representing neutron flux tallies in 4,400 unique light water reactor fuel assemblies in HDF5 format. Training samples consist of …
View article: Method to Estimate Thermal Transients in Reactors and Determine Their Parameter Sensitivities without a Forward Simulation
Method to Estimate Thermal Transients in Reactors and Determine Their Parameter Sensitivities without a Forward Simulation Open
Thermal response time is an important parameter for the control of fast reactors. Modern thermal hydraulic codes allow for the modeling of transient responses and can also be used to understand the dominant factors that affect them. Howeve…
View article: Estimating the effect of non-pharmaceutical interventions on US SARS-CoV-2 infections in the first year of the pandemic
Estimating the effect of non-pharmaceutical interventions on US SARS-CoV-2 infections in the first year of the pandemic Open
SARS-CoV-2 emerged in late 2019 as a zoonotic infection of humans, and proceeded to cause a worldwide pandemic of historic magnitude. Here, we use a simple epidemiological model and consider the full range of initial estimates from publish…
View article: Confidence estimation in the prediction of epithermal neutron resonance self-shielding factors in irradiation samples using an ensemble neural network
Confidence estimation in the prediction of epithermal neutron resonance self-shielding factors in irradiation samples using an ensemble neural network Open
Large neutron absorption resonances in the nuclides present in irradiation samples reduce the irradiating neutron flux at energies close to a resonance. In neutron activation analysis of optically thick samples with resonant isotopes, this…
View article: Stability instability and Hopf bifurcation in fission waves
Stability instability and Hopf bifurcation in fission waves Open
Edward Teller was the first to show that it would be possible for self-propagating fission waves to form in fertile nuclear materials. It is typically assumed that these waves would be asymptotically stable. However, we show here that coup…
View article: Detecting Nuclear Materials in Urban Environments Using Mobile Sensor Networks
Detecting Nuclear Materials in Urban Environments Using Mobile Sensor Networks Open
Radiation detectors installed at major ports of entry are a key component of the overall strategy to protect countries from nuclear terrorism. While the goal of deploying these systems is to intercept special nuclear material as it enters …
View article: VALIDATION OF COOLANT THERMAL RESPONSE IN A TRANSIENT FINITE DIFFERENCE THERMAL TRANSPORT MODEL WITH APPLICATIONS TO FAST SPECTRUM REACTORS
VALIDATION OF COOLANT THERMAL RESPONSE IN A TRANSIENT FINITE DIFFERENCE THERMAL TRANSPORT MODEL WITH APPLICATIONS TO FAST SPECTRUM REACTORS Open
Transient behavior in nuclear reactors is important in accidents and with reactivity control systems that are driven by thermal feedback. Here, we describe a transient finite difference model for a pin cell system. The fidelity of the mode…
View article: Reducing Irradiation Damage in a Long-Life Fast Reactor with Spectral Softening
Reducing Irradiation Damage in a Long-Life Fast Reactor with Spectral Softening Open
Long-life fast reactors receive considerable attention for their potential of using uranium efficiently, and because they can operate for extended periods without refueling. However, the main obstacle to achieving maximum operating times a…
View article: Fission waves can oscillate
Fission waves can oscillate Open
Under the right conditions, self sustaining fission waves can form in fertile nuclear materials. These waves result from the transport and absorption of neutrons and the resulting production of fissile isotopes. When these fission, additio…