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Title: A New Era of Nuclear Criticality Experiments: The First 10 Years of Radiation Test Object Operations at NCERC

Journal Article · · Nuclear Science and Engineering

The work presented in this paper focuses on the first 10 years (2011–2020) of radiation test object (RTO) operations at the National Criticality Experiments Research Center. RTOs are subcritical configurations of special nuclear material that are built by hand. These configurations are utilized for benchmark experiments, detector testing/characterization, and training. An overview of the types of measurements used in RTO operations is given as well as a history of RTO operations at Los Alamos National Laboratory from 1944–2011.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1900246
Journal Information:
Nuclear Science and Engineering, Vol. 195, Issue sup1; ISSN 0029-5639
Publisher:
Taylor & FrancisCopyright Statement
Country of Publication:
United States
Language:
English

References (43)

Measurement uncertainty of rossi-alpha neutron experiments journal November 2020
A New Era of Nuclear Criticality Experiments: The First 10 Years of Comet Operations at NCERC journal October 2021
A New Era of Nuclear Criticality Experiments: The First 10 Years of Godiva IV Operations at NCERC journal October 2021
A New Era of Nuclear Criticality Experiments: The First 10 Years of Flattop Operations at NCERC journal October 2021
Criticality of a 237 Np Sphere journal January 2008
Polyethylene-reflected plutonium metal sphere : subcritical neutron and gamma measurements. report November 2009
Neutron detectors for active interrogation of highly enriched uranium journal August 2004
Neutron multiplication measurements using moments of the neutron counting distribution journal October 1983
Physical Public Templates for Nuclear Warhead Verification journal January 2020
End of an Era for the Los Alamos Critical Experiments Facility: History of critical assemblies and experiments (1946–2004) journal November 2006
Results of Three Neutron Diagnosed Subcritical Experiments journal December 2018
Subcritical Measurements of a Plutonium Sphere Reflected by Polyethylene and Acrylic journal March 2009
Passive one-dimensional self-transmission imaging of subcritical metallic plutonium assemblies
  • Mueller, J. M.; Mattingly, J.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 903 https://doi.org/10.1016/j.nima.2018.06.070
journal September 2018
A Method to Estimate the Atomic Number and Mass Thickness of Intervening Materials in Uranium and Plutonium Gamma-Ray Spectroscopy Measurements journal October 2016
Thor, A Thorium-Reflected Plutonium-Metal Critical Assembly journal September 1979
Special Nuclear Material Characterization Using Digital 3-D Position Sensitive CdZnTe Detectors and High Purity Germanium Spectrometers journal October 2016
Sensitivity Analysis and Data Assimilation in a Subcritical Plutonium Metal Benchmark journal March 2014
Subcritical Noise Measurements with a Nickel-Reflected Plutonium Sphere journal November 2009
Prompt Fission Neutrons and Gamma Rays in a Monte Carlo Hauser-Feshbach Formalism journal January 2013
Validation of statistical uncertainties in subcritical benchmark measurements: Part II – Measured data journal March 2019
Extrapolated experimental critical parameters of unreflected and steel-reflected massive enriched uranium metal spherical and hemispherical assemblies report December 1997
FREYA—A New Monte Carlo Code for Improved Modeling of Fission Chains journal April 2013
Results and Analysis of the Spherical237Np Critical Experiment Surrounded by Highly Enriched Uranium Hemispherical Shells journal January 2006
Neutron Multiplicity Counting: Credible Regions for Reconstruction Parameters journal April 2016
Using anisotropies in prompt fission neutron coincidences to assess the neutron multiplication of highly multiplying subcritical plutonium assemblies
  • Mueller, J. M.; Mattingly, J.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 825 https://doi.org/10.1016/j.nima.2016.04.027
journal July 2016
Rossi-alpha measurements of fast plutonium metal assemblies using organic scintillators
  • Hua, Michael Y.; Bravo, Caiser A.; MacDonald, Aaron T.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 959 https://doi.org/10.1016/j.nima.2020.163507
journal April 2020
Low-resolution gamma-ray spectrometry for an information barrier based on a multi-criteria template-matching approach
  • Göttsche, Malte; Schirm, Janet; Glaser, Alexander
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 840 https://doi.org/10.1016/j.nima.2016.10.013
journal December 2016
Detectors for Active Interrogation Applications journal January 2017
Models for a three-parameter analysis of neutron signal correlation measurements for fissile material assay journal November 1986
Validating the performance of correlated fission multiplicity implementation in radiation transport codes with subcritical neutron multiplication benchmark experiments journal October 2018
Validation of the two-region Rossi-alpha model for reflected assemblies
  • Hua, Michael Y.; Darby, Flynn B.; Hutchinson, Jesson D.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 981 https://doi.org/10.1016/j.nima.2020.164535
journal November 2020
A New Era of Nuclear Criticality Experiments: The First 10 Years of Planet Operations at NCERC journal October 2021
Sensitivity Analysis of Neutron Multiplicity Counting Statistics Using First-Order Perturbation Theory and Application to a Subcritical Plutonium Metal Benchmark journal February 2017
Determination of neutron multiplication of subcritical HEU systems using delayed neutrons
  • Hollas, C. L.; Goulding, C.; Myers, W.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 543, Issue 2-3 https://doi.org/10.1016/j.nima.2004.12.016
journal May 2005
Proximity-Based Sensor Fusion of Depth Cameras and Isotropic Rad-Detectors journal May 2020
Spectroscopic fast neutron transmission imaging in a treaty verification setting journal January 2018
Derivation of the Two-Exponential Probability Density Function for Rossi-Alpha Measurements of Reflected Assemblies and Validation for the Special Case of Shielded Measurements journal September 2019
Application of Neutron Multiplicity Counting Experiments to Optimal Cross-Section Adjustments journal February 2020
Genetic algorithm for nuclear data evaluation applied to subcritical neutron multiplication inference benchmark experiments journal November 2019
Retrospective characterization of special nuclear material in time and space journal April 2020
Discriminating Uranium Isotopes Using the Time-Emission Profiles of Long-Lived Delayed Neutrons journal August 2018
Dispersion of the neutron emission in U-235 fission journal August 1956
Active neutron and gamma-ray imaging of highly enriched uranium for treaty verification journal August 2017

Figures / Tables (23)