scholarly journals Review of the Oak Ridge National Laboratory (ORNL) neutronic calculations regarding the conversion of the high flux isotope reactor (HFIR) to the use of low enriched uranium (LEU) fuel

2013 ◽  
Author(s):  
A. Bergeron
Keyword(s):  
National Laboratory ◽  
High Flux ◽  
Oak Ridge ◽  
Oak Ridge National Laboratory ◽  
Enriched Uranium

scholarly journals The CG-1D Neutron Imaging Beamline at the Oak Ridge National Laboratory High Flux Isotope Reactor

2015 ◽  
Vol 69 ◽  
pp. 104-108 ◽  
Author(s):  
Lou Santodonato ◽  
Hassina Bilheux ◽  
Barton Bailey ◽  
Jean Bilheux ◽  
Phong Nguyen ◽  
...  
Keyword(s):  
National Laboratory ◽  
Neutron Imaging ◽  
High Flux ◽  
Oak Ridge ◽  
Oak Ridge National Laboratory

scholarly journals The suite of small-angle neutron scattering instruments at Oak Ridge National Laboratory

2018 ◽  
Vol 51 (2) ◽  
pp. 242-248 ◽  
Author(s):  
William T. Heller ◽  
Matthew Cuneo ◽  
Lisa Debeer-Schmitt ◽  
Changwoo Do ◽  
Lilin He ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Large Scale ◽  
National Laboratory ◽  
High Flux ◽  
Oak Ridge ◽  
Large Scale Structures ◽  
Oak Ridge National Laboratory ◽  
Scale Structures

Oak Ridge National Laboratory is home to the High Flux Isotope Reactor (HFIR), a high-flux research reactor, and the Spallation Neutron Source (SNS), the world's most intense source of pulsed neutron beams. The unique co-localization of these two sources provided an opportunity to develop a suite of complementary small-angle neutron scattering instruments for studies of large-scale structures: the GP-SANS and Bio-SANS instruments at the HFIR and the EQ-SANS and TOF-USANS instruments at the SNS. This article provides an overview of the capabilities of the suite of instruments, with specific emphasis on how they complement each other. A description of the plans for future developments including greater integration of the suite into a single point of entry for neutron scattering studies of large-scale structures is also provided.

Seismic Evaluation of the Oak Ridge National Laboratory High Flux Isotope Reactor Support Assembly

2006 ◽  
Author(s):  
Gustavo A. Aramayo
Keyword(s):  
Structural Component ◽  
National Laboratory ◽  
Department Of Energy ◽  
Seismic Excitation ◽  
High Flux ◽  
Seismic Evaluation ◽  
Oak Ridge ◽  
Oak Ridge National Laboratory

The support assembly of the Oak Ridge National Laboratory High Flux Isotope Reactor (HFIR) was modeled to determine the assembly’s response to a seismic excitation. The compliance of this structural component to established U. S. Department of Energy (USDOE) standards [1, 2] is evaluated.

scholarly journals Setup for polarized neutron imaging using in situ 3He cells at the Oak Ridge National Laboratory High Flux Isotope Reactor CG-1D beamline

2017 ◽  
Vol 88 (9) ◽  
pp. 095103 ◽  
Author(s):  
I. Dhiman ◽  
Ralf Ziesche ◽  
Tianhao Wang ◽  
Hassina Bilheux ◽  
Lou Santodonato ◽  
...  
Keyword(s):  
National Laboratory ◽  
Neutron Imaging ◽  
High Flux ◽  
Oak Ridge ◽  
Oak Ridge National Laboratory ◽  
Polarized Neutron

scholarly journals As-Built Simulation of the High Flux Isotope Reactor

2021 ◽  
Vol 2 (1) ◽  
pp. 28-34
Author(s):  
Benjamin R. Betzler ◽  
David Chandler ◽  
Thomas M. Evans ◽  
Gregory G. Davidson ◽  
Charles R. Daily ◽  
...  
Keyword(s):  
Fuel Element ◽  
National Laboratory ◽  
Thermal Flux ◽  
Three Dimensional ◽  
Control Element ◽  
High Flux ◽  
Oak Ridge ◽  
Power Profile ◽  
Enriched Uranium ◽  
Fuel Meat

The Oak Ridge National Laboratory High Flux Isotope Reactor (HFIR) is an 85 MWt flux trap-type research reactor that supports key research missions, including isotope production, materials irradiation, and neutron scattering. The core consists of an inner and an outer fuel element containing 171 and 369 involute-shaped plates, respectively. The thin fuel plates consist of a U3O8-Al dispersion fuel (highly enriched), an aluminum-based filler, and aluminum cladding. The fuel meat thickness is varied across the width of the involute plate to reduce thermal flux peaks at the radial edges of the fuel elements. Some deviation from the designed fuel meat shaping is allowed during manufacturing. A homogeneity scan of each fuel plate checks for potential anomalies in the fuel distribution by scanning the surface of the plate and comparing the attenuation of the beam to calibration standards. While typical HFIR simulations use homogenized fuel regions, explicit models of the plates were developed under the Low-Enriched Uranium Conversion Program. These explicit models typically include one inner and one outer fuel plate with nominal fuel distributions, and then the plates are duplicated to fill the space of the corresponding fuel element. Therefore, data extracted from these simulations are limited to azimuthally averaged quantities. To determine the reactivity and physics impacts of an as-built outer fuel element and generate azimuthally dependent data in the element, 369 unique fuel plate models were generated and positioned. This model generates the three-dimensional (i.e., radial–axial–azimuthal) plate power profile, where the azimuthal profile is impacted by features within the adjacent control element region and beryllium reflector. For an as-built model of the outer fuel element, plate-specific homogeneity data, 235U loading, enrichment, and channel thickness measurements were translated into the model, yielding a much more varied azimuthal power profile encompassed by uncertainty factors in analyses. These models were run with the ORNL-TN and Shift Monte Carlo tools, and they contained upwards of 500,000 cells and 100,000 unique tallies.

scholarly journals CG2 general-purpose high-flux SANS instrument at HFIR at Oak Ridge National Laboratory

2008 ◽  
Vol 64 (a1) ◽  
pp. C188-C188
Author(s):  
K.C. Littrell ◽  
W.T. Heller ◽  
V.S. Urban ◽  
G.W. Lynn ◽  
K.M. Atchley ◽  
...  
Keyword(s):  
National Laboratory ◽  
General Purpose ◽  
High Flux ◽  
Oak Ridge ◽  
Oak Ridge National Laboratory ◽  
Sans Instrument
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