Andrew Worrall

Andrew Worrall

Andrew Worrall

Fuel Cycle Technology Leader


Key Roles:

  • Fuel Cycle Technology R&D Leader

  • Deputy Director, GAIN (Gateway for Accelerated Innovation in Nuclear)

  • UK Country Co-ordinator, DOE Office of Nuclear Energy

Andrew has nearly 25 years of professional experience in the United Kingdom and the United States working and leading in the fields of reactor physics, fuel and core design, plutonium disposition, fuel development and fuel cycle analysis (technical, economics, and safeguards).

Andrew is the senior leader responsible for providing technical leadership, coordination and integration for the numerous and diverse nuclear energy related fuel cycle R&D activities within the division consistent with existing programmatic missions and emerging opportunities.

His fuel cycle R&D leadership areas of responsibility include nuclear fuel cycle systems analyses for open, limited recycle (such as MOX fuel cycles) and closed fuel cycles, actinide transmutation in thermal and fast reactors and externally driven systems, evaluation of uranium, plutonium and thorium fuel cycles, fuel resources, fuel manufacturing, materials recovery, materials safeguards and security, used fuel management and disposition, and waste forms.

He is a delivery-focused Nuclear Engineer with demonstrated expertise and experience in performing, managing and leading international, multi-disciplinary and multi-agency projects and programs for a range of sponsors in the US and the UK.

Andrew has an extensive track record of working with a range of stakeholders, including sponsors, senior managers, government agencies, universities, regulators, and industry, both domestically and internationally. Experienced in initiating, leading and delivering on multi-organizational and multi-national programs, and is an effective communicator and collaborator.

Andrew is a recognized strategist, able to make complex arguments (technical and strategic) understood by a range of stakeholders and aid/lead them through the decision making process.

He is a Chartered Physicist (CPhys), a Fellow of the Institute of Physics (FInstP), and formerly a Royal Academy of Engineering Professor of Nuclear Engineering in the UK.

In December 2014 the US Department of Energy appointed Andrew as the Laboratory Lead Coordinator for nuclear energy research programs between the US and the UK.

Specialties include:

  • Nuclear programme management
  • Technical leadership and management
  • Strategist
  • PWR safety and performance and analysis
  • Plutonium management and strategy
  • Fuel cycle assessment
  • Fuel cycle economics
  • Nuclear energy strategy
  • Excellent and effective communicator; making complex, technical issues understandable to all.


(Includes Positions Awarded)

  • Fellow of the Institute of Physics
  • Chartered Physicist, Institute of Physics
  • Member of the American Nuclear Society (current)
  • Elected to the ANS Reactor Physics Division Executive Committee (current)
  • Elected Chair, ANS Oak Ridge/Knoxville Local Section (2014)
  • Member of the ANS
  • Member of the Institute of Nuclear Materials Management (current)
  • Member of the INMM Technical Program Committee (current)
  • Royal Academy of Engineering Professor in Nuclear Engineering, (2009-2014)
  • Visiting Professor at Imperial College, London (2009-2012)
  • Laboratory Director Significant Event Award “in recognition of significant contribution to the ORNL-led, multi-laboratory technical assessment of the used nuclear fuel inventory”.
  • Member of Laboratory Leadership Team (LLT), UK National Nuclear Laboratory, (2008-2011)
  • Chairman of Nuclear Industry Steering Committee for Post Graduate studies, University of Birmingham (2008-2012)
  • External Examiner for Masters in “Physics and Technology of Nuclear Reactors”, University of Birmingham (2004-2008)
  • Member of Post Graduate teaching and research steering committee, Imperial College, London (2009-2012)
  • Elected to the ANS Reactor Physics Division Program Committee (2010)
  • Nuclear Expert Commissioner of the Policy Commission on “Nuclear Power: What does the future hold?” at the University of Birmingham, UK.
  • Member of European Technical Safety Organisations Network (ETSON), on behalf of UK nuclear regulator (ONR).
  • Provided evidence to the UK Royal Society on non-proliferation and future fuel cycle issues in their study on stewardship of the nuclear fuel cycle
  • Member of International Technical Programme Committee, Session Organizer and similar roles for “Advances in Nuclear Fuel Management”, including panel chair at ANFM-V, GLOBAL, PHYSOR, as well as numerous ANS events.
  • Member of the OECD-NEA Working Party on Scientific Issues of Reactor Systems (WPRS)
  • Member of the OECD-NEA Task Force on Reactor Based Plutonium Disposition (TFRPD)
  • Member of the OECD-NEA WPRS publication group “Minor Actinide Burning in Thermal Reactors”
  • Awarded Outstanding Reviewer status by Elsevier (2014)
  • Member of the Engineering and Physical Sciences Research Council Review College, UK (2009-present)
  • Member of the National Physical Laboratory (NPL) advisory panel on metrology for nuclear application
  • Member of the EURATOM Framework Program Review Committee
  • Member of the British Nuclear Energy Society’s Board of Trustees (2005-2008)



  • UK Country Coordinator on behalf of US Department of Energy, Office of Nuclear Energy
  • Fuel Cycle Options Campaign, Principal Investigator
  • Accident Tolerant Fuels (ATF), Laboratory Lead for LWR neutronics and fuel performance, and Principal Investigator on Nuclear Energy University Program (NEUP) “Performance Assessment of Enhanced Accident Tolerant Fuels within Aggressive Operational Power Histories”
  • Next Generation Safeguards Initiative (NGSI) Spent Fuel, Principal Investigator
  • "Development of Fuel Cycle Data Packages for Thorium Fuel Cycle Options", and "ORIGEN-based Nuclear Fuel Depletion Module for Fuel Cycle", Principal Investigator
  • Plutonium Management Expert Group, US representative on bilateral agreements with France, Japan, and UK



  • A. Worrall, Chapter 4, “Core and fuel technologies in integral pressurised-water reactors (iPWRs)”, in book by MD Carelli, DT Ingersoll, Handbook of Small Modular Nuclear Reactors, ISBN 978-0-85709-851-1

Journal Articles (2015-current)

  • S Krahn, A Worrall, "The Reemergence of the Thorium Fuel Cycle: A Special Issue of Nuclear Technology", Nuclear Technology, Volume 194, May 2016, iii-iv
  • LG Worrall, A Worrall, et al "Safeguards Considerations for Thorium Fuel Cycles", Nuclear Technology, Volume 194, May 2016, pp281-293
  • BJ Ade, A Worrall, JJ Powers, SM Bowman, "Analysis of Key Safety Metrics of Thorium Utilization in LWRs", Nuclear Technology, Volume 194, May 2016, 162-177
  • B Feng et al "Standardized verification of fuel cycle modeling", Annals of Nuclear Energy, 94 (2016) 300–312
  • N.R. Brown, J.J. Powers, B. Feng, F. Heidet, N.E. Stauff, G. Zhang, M. Todosow, A. Worrall, J.C. Gehin, T.K. Kim, T.A. Taiwo, “Sustainable thorium nuclear fuel cycles: A comparison of intermediate and fast neutron spectrum Systems,” Nuclear Engineering and Design, 289, 252–265 (2015).
  • NM George, KA Terrani, JP Powers, A Worrall, GI Maldanado, Neutronic Analysis of Candidate Accident-Tolerant Cladding Concepts in Pressurized Water Reactors, Annals of Nuclear Energy, Volume 75, January 2015, 703–712

Conference Papers (2015-current)

  • BR Betzler, JJ Powers, A Worrall "Modeling and Simulation of the Start-up of a Thorium-Based Molten Salt Reactor", PHYSOR 2016, Sun Valley, ID, May 2016
  • J Littell, S Skutnik, A Worrall, E Sunny, "Assessment and Benchmarking with ORION and CYCLUS for US Fuel Cycle Options", PHYSOR 2016, Sun Valley, ID, May 2016
  • JL Peterson, E Sunny, W Wieselquist, A Worrall,  RWH Gregg, "Generating Cross Sections for ORION Fuel Cycle Models", PHYSOR 2016, Sun Valley, ID, May 2016
  • E. Hoffman, N. Brown, B. Carlsen, B. Feng, R. Hays,G. Raitses, N. Stauff, E. Sunny, A. Worrall, "Expanded Analysis of Transition to an Alternative Fuel Cycle", ICAPP 2016, San Francisco, CA, April 17-20 2016
  • NR Brown, A Worrall, M Todosow, "Fuel Cycle Performance of Thermal Spectrum Small Modular Reactors", ICAPP 2016, San Francisco, CA, April 17-20 2016
  • T Ault, S Krahn, A Worrall, A Croff, "Analysis of Synergistic Fuel Cycle Options with Thorium and Heavy Water Reactors", ANS Annual Meeting, June 2016
  • T Ault, S Krahn, A Worrall, B Burkhardt, C Caldwell, A Croff, "Insights and Trends from a Literature Assessment of the Thorium Fuel Cycle", ANS Annual Meeting, 2016
  • N George, R Sweet, A Worrall et al, "Fuel Performance Calculations for FeCrAl Cladding in BWRs", ANS Winter Meeting, Washington DC, November 2015
  • T Ault, S Krahn, A Worrall, A Croff, "Analysis of Multi-Stage Thorium Fuel Cycles for Improved Resource Utilization and Plutonium Inventory Management", Global 2015, Paris, France, 20-24 September 2015
  • JC Gehin, B Oakley, A Worrall, K Jenni, T Taiwo, R Wiegland, "An Approach for Assessing Development and Deployment Risks in the DOE Fuel Cycle Options Evaluation and Screening Study", Global 2015, Paris, France, 20-24 September 2015
  • EE Sunny, A Worrall, J Peterson, J Powers, J Gehin, RWH Gregg, "Transition Analysis of Promising U.S. Future Fuel Cycles Using ORION", Global 2015, Paris, France, 20-24 September 2015
  • J Hu, I Gauld, A Worrall, H Liljenfeldt, S Park, A Sjöland, I Kwon, and H Kim, “Spent Fuel Modeling and Simulation Using ORIGAMI for Advanced NDA Instrument Testing,” in Proc. of ANS MC2015 - Joint International Conference on Mathematics and Computation (M&C), Supercomputing in Nuclear Applications (SNA) and the Monte Carlo (MC) Method, April 19-23, 2015, Nashville, TN.
  • NM George, JP Powers, GI Maldanado, A Worrall, K Terrani, Full-Core BWR Neutronics Results of FeCrAl Enhanced Accident Tolerant Fuel, Advances in Nuclear Fuel Management, Hilton Head, SC, March 2015
  • NM George, JP Powers, GI Maldanado, A Worrall, K Terrani, Full-Core BWR Neutronics Methodology of FeCrAl Enhanced Accident Tolerant Fuel, Advances in Nuclear Fuel Management, Hilton Head, SC, March 2015