Photo of William Walters

William Walters

Assistant Professor


  • Mechanical and Nuclear Engineering
  • Nuclear Engineering

228 Reber Building


Research Areas:

Nuclear Power, Nuclear Science

Interest Areas:




  • BA Sc, Engineering Physics (Mechanical Option), University of British Columbia, 2007
  • MS, Nuclear Engineering Science, University of Florida, 2009
  • Ph D, Nuclear Engineering, Virginia Tech, 2015


Journal Articles

  • William Walters and Villy Christensen, 2018, "Ecotracer: analyzing concentration of contaminants and radioisotopes in an aquatic spatial-dynamic food web model", Journal of Environmental Radioactivity, 181, pp. 118 - 127
  • William Walters and Alireza Haghighat, 2017, "The adaptive collision source method for discrete ordinates radiation transport", Annals of Nuclear Energy, 105, pp. 45-58
  • A. Haghighat, K. Royston and William Walters, 2016, "MRT methodologies for real-time simulation of nonproliferation and safeguards problems", Annals of Nuclear Energy, 87, pp. 61-67
  • William Walters and Alireza Haghighat, 2016, "ACS algorithm in discrete ordinates for pressure vessel dosimetry", EPJ Web of Conferences, 106, pp. 03006
  • Nathan Roskoff, William Walters and Alireza Haghighat, 2016, "Application of the Subgroup Decomposition Method (SDM) for Reactor Simulation", EPJ Web of Conferences, 106, pp. 03008
  • William Walters, A. Haghighat, K. Royston, C. Yi and G. Sjoden, 2014, "A response function methodology to calculate induced fission neutron flux distribution in an active interrogation system", Progress in Nuclear Science and Technology, 4, pp. 533-537
  • Katherine Royston, Alireza Haghighat, William Walters, Ce Yi and Glenn Sjoden, 2014, "Determination of current at a detector window using a hybrid adjoint function methodology", Progress in Nuclear Science and Technology, 4, pp. 528-532
  • William Walters, A. Haghighat, Y. Ham and S. Sitaraman, 2012, "Development of INSPCT-S for inspection of spent fuel pool", Journal of ASTM International, 9, (4), pp. 1-11
  • Carl Walters, Villy Christensen, William Walters and Kenneth Rose, 2010, "Representation of multistanza life histories in Ecospace models for spatial organization of ecosystem trophic interaction patterns", Bulletin of Marine Science, 86, (2), pp. 439–459

Conference Proceedings

  • William Walters, 2017, "Application of the RAPID Fission Matrix Methodology to 3-D Whole-core Reactor Transport"
  • William Walters and Alireza Haghighat, 2016, "Neutronic analysis of the CHANDLER anti-neutrino detector", Proceedings of the Advances in Nuclear Nonproliferation Technology & Policy Conference (ANTPC), Santa Fe, NM, Sep. 25 - 30, 2016
  • William Walters, N. Roskoff and A. Haghighat, 2015, "A fission matrix approach to calculate pin-wise 3-D fission density distribution"
  • William Walters and A. Haghighat, 2014, "ACS algorithm in discrete ordinates for pressure vessel dosimetry"
  • Nathan Roskoff, William Walters, Alireza Haghighat, Ce Yi and Glenn Sjoden, 2014, "Implementation and verification of the SDM in the TITAN 3-DS N transport code"
  • William Walters, Katherine E. K. Royston and Alireza Haghighat, 2014, "Theory and Performance of AIMS for Active Interrogation", EDP Sciences
  • William Walters, Nathan Roskoff, Katherine K Royston and Alireza Haghighat, 2014, "Use of the fission matrix method for solution of the eigenvalue problem in a spent fuel pool"
  • Alireza Haghighat, Katherine Royston, William Walters, Ce Yi and Glenn E Sjoden, 2013, "Development of AIMS hybrid tool for active interrogation"
  • Shivakumar Sitaraman, Y Ham, William Walters, Alireza Haghighat and O Peixoto, 2011, "In-Situ verification of Spent Fuel at the Atucha-I Nuclear Power Plant"
  • William Walters, A Haghighat, M Wenner, Sitaraman Shivakumar and Ham Young, 2010, "A methodology for determination of detector response for inspection of a spent fuel pool - 205"
  • William Walters, M Wenner, A Haghighat, S Sitaraman and YS Ham, 2009, "Methodology and Determination of Field of View of Neutron and Gamma Detectors in the Atucha Spent Fuel Storage Pool"
  • William Walters, Alireza Haghighat, Michael Wenner, Shivakumar Sitaraman and Young Ham, 2009, "Calculation of Sub-critical Multiplication Using a Simplified Fission Matrix Method", 101, pp. 447–448


  • William Walters, 2015, "Development of the Adaptive Collision Source Method for Discrete Ordinates Radiation Transport"
  • William Walters, 2009, "Development of a Calculation Methodology to Determine Detector Response in a Spent Fuel Pool"

Research Projects

Honors and Awards

  • Nuclear Regulatory Commission Fellowship, University of Florida, 2009 - 2011
  • Alumni Fellowship, University of Florida, 2007 - 2011
  • Best Student Paper Award, PHYSOR 2010 Conference, 2010
  • Academic All-Canadian, CIS, 2006
  • Undergraduate Student Research Award, NSERC, 2005
  • Academic All-Canadian, CIS, 2005
  • Academic All-Canadian, CIS, 2002
  • Alpha Nu Sigma National Honor Society, American Nuclear Society, 2010


Service to Penn State:

  • Member, Penn State Reactor Safeguards Committee, March 2017 - March 2020
  • Committee Member, Nuclear Engineering Faculty Search Committee, July 2017 - April 2018
  • Evaluator, Selection Committee member, Schreyer Honors College Selection Committee, 2016
  • Member, Graduate Recruitment & Support Committee, September 2016

Service to External Organizations:

  • Committee Member, Executive Committee Member, American Nuclear Society Reactor Physics Division, June 2017 - June 2020
  • Committee Member, American Nuclear Society Standards Committee, November 2016



The Department of Mechanical and Nuclear Engineering at Penn State is one of the nation’s largest and most successful engineering departments. We serve more than 1,000 undergraduate students and more than 330 graduate students

We offer B.S. degrees in mechanical engineering and nuclear engineering as well as resident (M.S., Ph.D.) and online (M.S., M.Eng.) graduate degrees in nuclear engineering and mechanical engineering. MNE's strength is in offering hands-on experience in highly relevant research areas, such as energy, homeland security, biomedical devices, and transportation systems.

Department of Mechanical and Nuclear Engineering

137 Reber Building

The Pennsylvania State University

University Park, PA 16802-4400

Phone: 814-865-2519