Vladimir Sobes

Vladimir Sobes

Research and Development Staff

Bio

Dr. Vladimir Sobes is currently a Research and Development Staff Member in the Nuclear Data and Criticality Safety group at Oak Ridge National Laboratory (ORNL). He received a Bachelor of Science degree in Nuclear Science and Engineering from the Massachusetts Institute of Technology (MIT) in 2011. After receiving his Doctoral degree from the same department two and half years later, Sobes began working at ORNL.

As a nuclear data specialist, Dr. Sobes focuses his research on evaluation of nuclear data and propagation of nuclear data uncertainty for a wide range of end-use applications. The motivating factor for his research is to optimize the bene fits of nuclear energy by increasing the safety of nuclear installations by providing better nuclear data and the understanding of how the uncertainty in nuclear data drives our ability to perform predictive modeling and simulation of nuclear systems. As a member of the nuclear data team at ORNL, Dr. Sobes shares responsibilities for the measurement, evaluation and validation of nuclear data for the international nuclear community, methods and code development for data applications, nuclear criticality safety analysis and reactor physics methods development. He is also the ORNL oversight technical lead for the design and construction of the University of Tennessee, Knoxville (UTK) sub-critical experiment facility.

Dr. Sobes has demonstrated his flexibility and breadth of knowledge by taking on research outside the fi eld of nuclear data. He has contributed to the United States (US) Department of Energy effort of evaluating the feasibility of direct disposal of spent nuclear fuel in a geologic repository. Early on in his career, Dr. Sobes conducted reactor analysis research and in recent years he took on a research project to develop new statistical inference methods for criticality calculations for the US Nuclear Regulatory Commission.

Dr. Sobes has over 30 peer-reviewed publications in international journals, technical reports and conference proceedings. He is an active member of the American Nuclear Society serving on the Education Committee and the Technical Program Committee for the Nuclear Criticality Safety Division. He is also an active participant in two OECD/NEA1 Working Party on International Nuclear Data Evaluation Co-operation (WPEC) expert subgroups and group coordinator and founding member of a new subgroup on "Investigation of Covariance Data in General Purpose Nuclear Data Libraries."

Awards

Best Paper Award
Nuclear Criticality Safety Program Technical Program Review
Mar. 14 - 15, 2017, Washington, DC
"FY16 Progress in Resonance Evaluations of Ce and Gd for the NCSP" selected as the best research paper from the US DOE Nuclear Criticality Safety Program for Fiscal Year 2016.

Best Paper Award
2016 American Nuclear Society Annual Meeting
Jun. 12 - 16, 2016, New Orleans, LA
"Benchmarking of the Updated Resolved Resonance Region Evaluations of Copper" selected as the best research paper from the Data, Analysis and Operations in Nuclear Criticality Safety Session.

Best Paper Award
Nuclear Criticality Safety Program Technical Program Review
Mar. 15 - 16, 2016, Albuquerque, NM
“Improvements for the 63,65Cu Resonance Evaluations for Criticality Safety Applications” selected as the best research paper from the US DOE Nuclear Criticality Safety Program for Fiscal Year 2015.

Best Paper Award
Nuclear Criticality Safety Program Technical Program Review
Mar. 18 - 19, 2015, Livermore, CA
“Nuclear Data Adjustment with SAMMY Based on Integral Experiments” selected as the best research paper from the US DOE Nuclear Criticality Safety Program for Fiscal Year 2014.

Publications

JOURNAL PUBLICATIONS
V. Sobes, et al., ENDF/B-VIII.0 Covariance Data Development and Testing, Nuclear Data Sheets (submitted), (2019).
E. Dupont, et al., HPRL - International cooperation to identify and monitor priority nuclear data needs for nuclear applications, Nuclear Data Sheets (submitted), (2019).
M. Fleming, et al., Overview of the OECD-NEA Working Party on International Nuclear Data Evaluation Cooperation (WPEC), Nuclear Data Sheets (submitted), (2019).
D. Brown, et al., ENDF/B-VIII.0: The 8th Major Release of the Nuclear Reaction Data Li- brary with CIELO-project Cross Sections, New Standards and Thermal Scattering Data, Nuclear Data Sheets, 148, (2018).
G. Arbanas, J. Feng, V. Sobes, et al., Bayesian Optimization of Generalized Data, EPJ Nuclear Sci. Tech. 4, (2018).
V. Sobes, et al., Application of the SAMINT Methodology to the New Cross-Section Eval- uations of Cu-63 and Cu-65, European Physical Journal, 146, Sept. (2017).
G. Arbanas, V. Sobes, et al., Generalized Reich-Moore R-matrix Approximation, European Physical Journal, 146, Sept. (2017).
P. Ducru, C. Josey, K. Dibert, V. Sobes, et al., Kernel reconstruction methods for Doppler broadening cross section temperature interpolation by linear combination of reference temperatures cross sections, Journal of Computational Physics, Jan. (2017).
M.Alamaniotis, L.H. Tsoukalas, P.L. Lagari, V. Sobes, Application of Artificial Neural Networks to Reliable Nuclear Data for Nonproliferation Modeling and Simulation, Int. J. Monit. Surveill. Technol. 4(4), Oct. (2016).
V. Sobes, L. Leal, G. Arbanas, B. Forget, Resonance Parameter Adjustment Based on Integral Experiments, Nuclear Science and Engineering, 183(3), Jul. (2016).
V. Sobes, L. Leal, B. Forget, K. Guber, New Resolved Resonance Region Evaluations for 63Cu and 65Cu to Support Nuclear Criticality Safety Analyses, Nuclear Data Sheets, 115, Mar. (2014).
P. Pereslavtsev, A. Konobeyev, U. Fischer, V. Sobes, L. Leal, New Evaluation of n+63,65Cu Nu- clear Cross Section Data up to 200 MeV Neutron Energy, Nuclear Data Sheets, 115, Mar. (2014).
V. Sobes, B. Forget, A. Kadak, Individual Pebble Temperature Peaking Factor due to Local Pebble Arrangement in a Pebble Bed Reactor Core, Nuclear Engineering and Design, 241(1), Jan. (2011).

LABORATORY REPORTS
V. Sobes, et al., Nuclear Data and Benchmarking Program: Nuclear Data and Covariance Assessment, ENDF/B-VIII.0 Covariance Data Development and Testing Report, ORNL Letter Report (in review), (2019)
G. Arbanas, D. Wiarda, A. Holcomb, V. Sobes, et al. NCSP ORNL Nuclear Data Subtask 6 (ND6): SAMMY Modernization, ORNL Letter Report, ORNL/LTR-2017/536, Dec. (2017).
V. Sobes, L. Leal, IRSN-ORNL Cooperation on Nuclear Data and Criticality Safety Sum- mary Report, IRSN Laboratory Report, Dec. (2015).
V. Sobes, J. Scaglione, M. Dunn, Validation Study for Crediting Chlorine in Criticality Anal- yses for US Spent Nuclear Fuel Disposition, Prepared for US DOE Used Fuel Disposition Cam- paign, FCRD-UFD-2015-00638, Dec. (2014).
Bean, Malcolm K., ... , V. Sobes, et al., Conceptual Design of Molten Salt Loop Experiment for MIT Research Reactor, Center for Advanced Nuclear Energy Systems. MIT Reactor Redesign Program, MIT Press, (2011).

PEER-REVIEWED CONFERENCE PUBLICATIONS
V. Sobes, L. Leal, An Overview of the Status of Lead Evaluations in ENDF/B-VIII.0 and JEFF 3.3, Trans. Am. Nucl. Soc., 119, Nov. (2018).
W. Hines, J. Pevey, V. Sobes, Preliminary Design of a Fast Flux User Facility at the University of Tennessee, Trans. Am. Nucl. Soc., 119, Nov. (2018).
C. Perfetti, V. Sobes, et al., SCALE Resonance Parameter Sensitivity Coefficient Calculations, Trans. Am. Nucl. Soc., 119, Nov. (2018).
V. Sobes, K. Guber, L. Leal, FY 2016 Progress in Resonance Evaluations of Gadolinium for the NCSP, Trans. Am. Nucl. Soc., 117, Nov. (2017).
V. Sobes, K. Guber, Status of a New Resonance Evaluation for Cerium to Support Nuclear Criticality Safety Applications, Trans. Am. Nucl. Soc., 116, Jun. (2017).
V. Sobes, L. Leal, M. Falk, A Study of the Required Fidelity for the Representation of Angular Distributions of Elastic Scatting in the Resolved Resonance Region for Nuclear Criticality Safety Applications, Int. Conf. on Math. & Comp. Methods App. to Nucl. Sci. & Eng., Apr. (2017).
A. Alhajri, V. Sobes, C. Perfetti, B. Forget, Calculating Resonance Parameter Sensitivity Coefficients in SCALE, Int. Conf. on Math. & Comp. Methods App. to Nucl. Sci. & Eng., Apr. (2017).
V. Sobes, L. Leal, K. Guber, Finalizing the Cu-63 and Cu-65 Resonance Evaluations for the ENDF/B-VIII Release, Trans. Am. Nucl. Soc., 115, Nov. (2016).
P. Ducru, C. Josey, K. Dibert, V. Sobes, et al., Optimal temperature grid for accurate Doppler kernel reconstruction, Trans. Am. Nucl. Soc., 115, Nov. (2016).
V. Sobes, K. Guber, et al., Calculated Resonance Properties from the New Resolved Resonance Region Evaluations of Copper, The 2016 R-Matrix Workshop on Methods and Applications, Jun. (2016).
V. Sobes, L. Leal, Benchmarking of the Updated Resolved Resonance Region Evaluations of Copper, Trans. Am. Nucl. Soc., 114, Jun. (2016).
P. Ducru, V. Sobes, B. Forget, K. Smith, On Methods for Conversion of R-Matrix Resonance Parameters to Multi-pole Formalism - Numerics of Algebraic Conversion, PHYSOR 2016, May (2016).
V. Sobes, et al., SAMINT: A New Evaluation Tool to Perform Resonance Parameter Data Adjustments based on Integral Experiment Data, Trans. Am. Nucl. Soc., 113, Nov. (2015).
P. Ducru, C. Josey, V. Sobes, et al., Doppler Broadening by Linear Combination of Reference Temperature Cross Sections, Trans. Am. Nucl. Soc., 113, Nov. (2015).
V. Sobes, B. Rearden, et al., Upper Subcritical Calculations Based on Correlated Data, Trans. of Int. Conf. on Nucl. Crit. Safety, Sept. (2015).
V. Sobes, L. Leal, G. Arbanas, Nuclear Data Adjustment with SAMMY Based on Integral Experiments, Trans. Am. Nucl. Soc., 111, Nov. (2014).
L. Leal, V. Sobes, et al., ORNL Nuclear Data Evaluation Accomplishments for FY2013, Trans. Am. Nucl. Soc., 111, Nov. (2014).
V. Sobes, L. Leal, Results for the Intermediate-Spectrum Zeus Benchmark Obtained with New 63,65Cu Cross-Section Evaluations, Trans. Am. Nucl. Soc., 110, Jun. (2014).
V. Sobes, L. Leal, B. Forget, Coupled Differential and Integral Data Analysis for Improved Uncertainty Quantification, Trans. Am. Nucl. Soc., 109, Nov. (2013).
E. Paramanova, V. Sobes, B. Forget, G. Kohse, Radiative Capture Cross Section Measurement of Copper for EXFOR Database, Trans. Am. Nucl. Soc., 107, Nov. (2012).
V. Sobes, L. Leal, K. Guber, B. Forget, Preliminary Resolved Resonance Region Evaluation of Copper-63 from 0 to 300 keV, PHYSOR 2012, Apr. (2012).
V. Sobes, R. Macdonald, L. Leal, B. Forget, K. Guber, G. Kohse, Thermal Total Cross Section Measurement for 63Cu and 65Cu at the MIT Reactor, Trans. Am. Nucl. Soc., 106, Nov. (2011).
V. Sobes, L. Leal, H. Derrien, D. Wiarda, D. Muller, B. Forget, Processing and Testing New 240Pu Resolved Resonance and Covariance Evaluation, Trans. Am. Nucl. Soc., 105, Jun. (2011).

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