A5003888346- Nuclear reactor physics and engineering
- Nuclear Engineering Thermal-Hydraulics
- Nuclear Materials and Properties
- Graphite, nuclear technology, radiation studies
- Fusion materials and technologies
- Nuclear and radioactivity studies
- Nuclear Physics and Applications
- Heat transfer and supercritical fluids
- Combustion and Detonation Processes
- Probabilistic and Robust Engineering Design
- Vehicle emissions and performance
- Magnetic confinement fusion research
- Superconducting Materials and Applications
- Lattice Boltzmann Simulation Studies
- Geotechnical Engineering and Underground Structures
- Advanced Numerical Methods in Computational Mathematics
- Radioactive element chemistry and processing
- nanoparticles nucleation surface interactions
- Additive Manufacturing Materials and Processes
- Minerals Flotation and Separation Techniques
- Geophysical Methods and Applications
- Risk and Safety Analysis
- Flow Measurement and Analysis
- Fluid Dynamics and Turbulent Flows
- Energetic Materials and Combustion
Oak Ridge National Laboratory
2012-2024
National Technical Information Service
2021
Office of Scientific and Technical Information
2021
Lavrentyev Institute of Hydrodynamics
2018-2020
Bethel University
2018
UT-Battelle
2005
The research objective of this work was to improve the engineering predictions turbulence characteristics flows in curved narrow channels. Such channel are commonly encountered nuclear and test reactors, with one them being high-flux isotope reactor (HFIR). Research reactors bear high heat fluxes, proper computing is paramount for safe reliable operation. study builds on results a previous direct numerical simulation inform well-known Reynolds-averaged Navier–Stokes shear-stress model...
A study on the Fukushima Daiichi nuclear power station spent-fuel pool (SFP) at Unit 4 (SFP4) is presented in this paper. We discuss design characteristics of SFP4 and its decay heat load detail provide a model that we developed to estimate SFP evaporation rate based temperature. The level following March 11, 2011, accident predicted fundamental conservation laws mass energy. Our temperatures are good agreement with measured data consistent Tokyo Electric Power Company evaluation results.
Abstract The authors developed an artificial intelligence (AI)-based algorithm for the design and optimization of a nuclear reactor core based on flexible geometry demonstrated 3× improvement in selected performance metric: temperature peaking factor. rapid development advanced, specifically, additive manufacturing (3-D printing) its introduction into advanced through Transformational Challenge Reactor program have presented opportunity to explore arbitrary nuclear-heated structures. primary...
Abstract A direct numerical simulation (DNS) study was performed on turbulent flow in the high flux isotope reactor involute channel geometry to develop a database and determine differences compared with flat parallel channel. The varying curvature along walls studied for mean profiles. Parameters of interest include streamwise velocity, kinetic energy (TKE), turbulence dissipation rate, as well Reynolds stresses transport terms. Profile sampling carried out at 10 locations span involute....
The structure of deterministically nanopatterned surfaces created using a combination electron beam lithography and reactive ion etching was evaluated small-angle neutron scattering (SANS). Samples exhibit 2D patterns that confirm the presence ordered nanoscale cavities consistent with targeted morphologies as well SEM data analysis. Comparison SANS intensities obtained from samples in air contact an aqueous phase (pure deuterium oxide, D2O, or contrast matched mixture D2O + H2O) reveals...
The results of experimental study concerning a continuous spin detonation hydrogen-oxygen mixture in flow-through plane-radial combustor with diameter 10 cm and exhaustion toward the periphery regime oxygen ejection are presented. In experiment, regimes one two transverse waves rotating velocity D = 1.3÷1.43 1.45÷1.54 km/s, measured relative to inner cylindrical surface combustor, respectively, near-sonic velocities about 0.7 km/s have been observed. pulse combustion frequencies 4.4 – 3.6...
Experiments using boiling water on untreated (roughness 100–300 nm) metal surfaces small-angle neutron scattering (SANS) show the appearance of structures that are 50–70 nm in size when is present. The signal disappears ceases, and no change detected at any surface temperature condition below saturation. This confirms caused by vapor nanobubbles. Two regimes evaluated herein differ degree subcooling (3–10 °C). A polydisperse spherical model with a log-normal distribution fits SANS data well....
Flow rotation and mixing in a VVER-1000 reactor is investigated using two system codes with three-dimensional fluid-dynamics modeling capabilities (RELAP5-3D TRACE) computational (CFD) code (FLUENT). Coarse-mesh models were developed for the codes, their applicability evaluated test data as well detailed CFD results obtained. Two different temperature zone mapping schemes comparison measured are proposed discussed.The very informative when used to examine real loop taking place at nuclear...
Detailed thermal-hydraulic analysis of commercial power reactors requires modeling complex multidimensional thermal, fluids, and neutronic behavior. One code that has three-dimensional (3-D) capabilities is RELAP-3D. A comparison RELAP-3D predictions to experimental data obtained during start-up the Kozloduy VVER-1000 nuclear plant in Bulgaria presented here. The experiment distinguishable 3-D hydraulics effects allow for model verification reasonable agreement with results obtained.The...
ITER inductive power operation is modeled and simulated using a thermal-hydraulics system code (RELAP5) integrated with 3-D CFD (SC-Tetra) code. The Primary Heat Transfer System (PHTS) functions are predicted together the main parameters operational ranges. control algorithm strategy derivation summarized as well.The First Wall Blanket modules primary components of PHTS, used to remove major part thermal heat from plasma. represent set flow channels in solid metal structure that serve absorb...