United States Nuclear Regulatory Commission - Protecting People and the Environment

ACRS Membership

The ACRS is composed of individuals with a wide variety of engineering expertise. The membership currently includes expertise in nuclear engineering, risk assessment, chemistry, facility operations management, severe accident phenomena, materials science and metallurgy, digital instrumentation and control systems, thermal hydraulic and heat transfer, and mechanical, civil, and electrical engineering. Consultants are engaged to provide technical assistance on specific issues when required. ACRS members are appointed for four-year terms and normally serve no more than three terms.

Committee Members

Select one of the following names for biographical information about that member:

    John W. Stetkar, Chairman, is the Principal of Stetkar and Associates, Lake Forest, California. more

    Harold Ray, Vice Chairman, is a Retired Chief Executive Vice President of Southern California Edison Company, Rosemead, California. more

    Dennis C. Bley , Member-at-Large, is the President of Buttonwood Consulting, Inc., Oakton, VA. more

    Ronald Ballinger is a professor of nuclear science, materials science and engineering and is head of the H.H. Uhlig Corrosion Laboratory at the Massachusetts Institute of Technology (MIT). more

    Sanjoy Banerjee is a Distinguished Professor of Chemical Engineering and the Director of the Institute for Sustainable Energy Technologies at the Grove School of Engineering at City College of New York, New York. more

    Charles H. Brown, Jr. is the Senior Advisor for Electrical Systems for BMT Syntek Technologies, Inc., Arlington, VA. more

    Michael L. Corradini is Professor and Chairman of the Department of Engineering Physics at the University of Wisconsin, Madison, Wisconsin. more

    Dana A. Powers is a Senior Scientist for Sandia National Laboratories in Albuquerque, New Mexico. more

    Joy L. Rempe is Laboratory Fellow and Group Leader at the Idaho National Laboratory (INL). more

    Peter Riccardella has more than 45 years’ experience working on the structural integrity of nuclear power plant components. more

    Michael T. Ryan is the Principal of Michael T. Ryan and Associates LLC, Lexington, South Carolina. more

    Stephen P. Schultz is a nuclear engineering consultant in Charlotte, N.C., and a consultant to the International Atomic Energy Agency. more

    Gordon R. Skillman is an independent consultant in nuclear power plant design and operation with over 45 years of commercial nuclear power experience. more

See also the Committee Membership Lists Since 1957.

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John W. Stetkar, Chairman

Mr. John W. Stetkar is Principal of Stetkar & Associates, Lake Forest, California, and has more than 27 years of experience as an engineering consultant. He is an internationally recognized expert in the fields of risk assessment and reliability analysis. Mr. Stetkar also serves as a technical expert for the International Atomic Energy Agency. Prior to his career as a consultant, he was a licensed senior reactor operator at Zion Nuclear Station. He holds a B.S. in electrical engineering and a M.S. in nuclear and environmental engineering from the Massachusetts Institute of Technology.

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Harold Ray, Vice Chairman

Mr. Harold B. Ray earned his B.S. in Mechanical Engineering from the University of California, Los Angeles in 1963 and his M.S. from the California Institute of Technology in 1970. He also earned a M.S. in Management from Claremont Graduate School in 1983.

Mr. Ray served as a reactor engineer in the Naval Reactors Division, U.S. Atomic Energy Commission, during 1964-1969, during which time he completed the reactor engineering certification at the Bettis Atomic Power Laboratory.

Mr. Ray served as the Chief Nuclear Officer at Southern California Edison (SCE) from 1990 until his retirement in 2006. As the Chief Nuclear Officer, he was responsible for all nuclear facilities and programs, including operation, maintenance and modification of San Onofre Nuclear Generating Station and for the management of SCE’s ownership interest in Palo Verde Nuclear Generating Station. He was also responsible for all power generating facilities, including nuclear and related fuel supplies and the wholesale purchasing and sale of electrical power and services. Mr. Ray enjoyed a successful career at SCE that spanned more than 36 years.

Now retired from his position as Executive Vice President of SCE, Mr. Ray provides input and guidance concerning generating plant and market development as an executive consultant with SCE.

Mr. Ray is a Registered Professional Engineer in the state of California, and a member of the American Nuclear Society (ANS), the American Society of Mechanical Engineers, and Sigma Xi. Mr. Ray is also a past President of the ANS and served in industry leadership positions as part of the Nuclear Energy Institute and at the Institute of Nuclear Power Operations.

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Dennis Bley, Member-at-Large

Dr. Dennis C. Bley is President of Buttonwood Consulting, Inc., in Oakton, VA, with more than 30 years of experience in nuclear and electrical engineering, and reliability and availability analysis. He has served on a number of technical review panels for NRC and Department of Energy programs and is a frequent lecturer in short courses for universities, industry, and government agencies. Dr. Bley holds a B.S. in Electrical Engineering from the University of Cincinnati, and a doctorate in nuclear reactor engineering from the Massachusetts Institute of Technology. In addition, he attended the U.S. Navy Nuclear Power School in 1968 and the Center College of Kentucky in 1963.

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Ronald Ballinger

Dr. Ronald Ballinger is a professor of nuclear science, materials science and engineering and is head of the H.H. Uhlig Corrosion Laboratory at the Massachusetts Institute of Technology (MIT). His areas of specialization are materials selection, nuclear engineering systems, environmental degradation and life assessment of these systems. In addition to the courses he has taught at MIT, Dr. Ballinger has also developed and taught several industrial courses on environmental degradation with EPRI and the Materials Aging Institute.

Dr. Ballinger has a bachelor's in mechanical engineering from Worcester Polytechnic Institute. He earned master's degrees in nuclear engineering and materials science and a doctorate in nuclear materials engineering from MIT. He is a member of several professional societies and has chaired the Materials Science and Technology Division of the American Nuclear Society.

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Sanjoy Banerjee

Dr. Sanjoy Banerjee received both his Ph.D. and B.S. in the field of Chemical Engineering. His Ph.D. was earned from the University of Waterloo, Canada, in 1968 and his B.S. degree from IIT, Kharagpur, India, in 1965.

Dr. Banerjee is a Distinguished Professor of Chemical Engineering and the Director of the Institute for Sustainable Energy Technologies at The Grove School of Engineering at City College of New York, New York. Previously, Dr. Banerjee was a member of the faculty of University of California, Santa Barbara (UCSB) where he held a joint appointment in the Chemical and Mechanical Engineering departments. He served as chairman of the Department of Chemical Engineering from 1984-1989. Prior to coming to UCSB, Dr. Banerjee was the Westinghouse Professor of Engineering Physics at McMaster University and was Acting Director of the Applied Science Division at Atomic Energy of Canada.

Dr. Banerjee’s research interests are related to multiphase and turbulent flows. He is a co-inventor of the SpectraFluidics technology and co-founder of the company. In addition, he has authored more than 190 articles and book chapters; refereed conference proceedings; holds four patents; and presented the 1997 Annual Guest Lecture of the Council for Chemical Research in the Netherlands. Dr. Banerjee is also the recipient of numerous awards; most recently, he was the DOW-M.M. Sharma Distinguished Visiting Fellow at the University of Bombay in 2003-2004.

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Charles H. Brown, Jr.

Mr. Charles H. Brown, Jr. earned his M.S. in Engineering and his B.S. in Electrical Engineering with honors from the University of Louisville.

Currently, Mr. Brown is the Senior Advisor for Electrical Systems with BMT Syntek Technologies, Inc., in Arlington, VA. Previously, he spent 22 years as Director of Instrumentation and Control Division of the Naval Nuclear Propulsion Program with the Naval Sea Systems Command. He has more than 35 years of experience in engineering management involving policy setting, planning, and technical direction for reactor plant instrumentations, control, protection, and technical systems equipment design; development and systems integration; procurement; and long-term support programs management for all nuclear powered ships for the Naval Nuclear Propulsion Program of the U.S. Navy.

Mr. Brown is a Registered Professional Engineer in the state of Virginia. He is a Senior Member of the Institute of Electrical and Electronic Engineers and a Life Member of the American Society of Naval Engineers.

Mr. Brown lives in McLean, Virginia, with his wife Gwendolyn. They have two successful children (Dr. Charles Brown, DDS, and Ms. Cassandra Walsh, CPA) and three lovely grandchildren.

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Michael L. Corradini

Dr. Michael Corradini earned his B.S. in Mechanical Engineering at Marquette University in Milwaukee, WI, in 1975 and both his Ph.D. and M.S. in Nuclear Engineering at the Massachusetts Institute of Technology, Cambridge, MA, in 1978 and 1976, respectively.

Dr. Corradini is Professor and Chair of the Nuclear Engineering and Engineering Physics program at the University of Wisconsin. He is also the Director of Wisconsin Institute of Nuclear Systems. He has more than 30 years of research experience in the areas of multi-phase fluid mechanics and heat transfer, nuclear reactor safety, severe accidents, reactor operation, energy policy, and nuclear waste disposal. Dr. Corradini has extensive research experience in phenomenology beyond the design basis accidents in light-water reactors, including molten fuel coolant interactions, molten core-concrete interactions, hydrogen generation, and containment response.

Dr. Corradini has served on various advisory committees, received numerous awards, and authored two book chapters and one book (on multi-phase flow) and more than 200 technical papers. He was a consultant to the ACRS from 1982 to 1997. During this time he was very insightful in providing assistance to the Committee on many technical issues associated with severe accident progression, source term, containment performance, and development of severe accident policy statement. Dr. Corradini is a Fellow of the American Nuclear Society and a member of the National Academy of Engineering. In 2002 and 2003, he served as Chairman of the Nuclear Waste Technical Review Board. In 2006, he was appointed to the scientific advisory board to the French Civilian Atomic Energy Agency.

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Dana A. Powers

Dr. Dana A. Powers received his B.S. in Chemistry from the California Institute of Technology in 1970, and his Ph.D. in Chemistry, Chemical Engineering and Economics in 1975 from the same institution.

Dr. Powers began his career with Sandia National Laboratories in 1974 as a staff member in the Chemistry and Metallurgy Division. He developed techniques for the hot pressing of metallothermic reaction mixtures and studied the nature of metallothermic reaction ignition. He was a consultant to the President's Commission on the accident at Three Mile Island.

From 1981 through August 1991, he was a Division Supervisor. He supervised experimental and analytic investigations of severe reactor accident phenomena on behalf of the NRC and the Department of Energy.

From August 1991 to March 1992, Dr. Powers was an Acting Department Manager. He managed conducting in-pile experiments, out-of-pile experiments and phenomenological modeling of nuclear reactor accidents and the development of plasma-facing components for fusion reactors.

Presently, Dr. Powers is a Senior Scientist, Nuclear Technology Center. He is responsible for the development of safety research programs for Department of Energy nuclear facilities. He is a member of the Chemical Reactions Subcommittee of the Tank Advisory Panel examining safety issues of radioactive wastes stored by the Department of Energy.

From 1986 through 1991, Dr. Powers served as a consultant on a variety of boards and committees, including the International Nuclear Safety Advisory Group (IAEA) on the Chernobyl Accident, and the Advisory Committee on Reactor Safeguards' Subcommittee on Class 9 Accidents. He was a member of the National Research Council Committee to Assess Safety and Technical Issues at Department of Energy Reactors, the National Research Council Steering Committee for the Workshop on Chemical Processes and Products in Severe Reactor Accidents, and the Department of Energy Advisory Committee on Nuclear Facility Safety.

Dr. Powers is a member of the American Chemical Society, the American Nuclear Society, and Tau Beta Pi. He has also written numerous publications.

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Joy L. Rempe

With nearly 30 years of experience in reactor safety and high temperature testing, Joy L. Rempe is Laboratory Fellow and Group Leader at the Idaho National Laboratory (INL) where she leads in-pile instrumentation development efforts for INL’s Advanced Test Reactor National Scientific User Facility. She also serves as a member of several advisory groups reviewing the US Department of Energy (DOE) Office of Nuclear Energy Research and Development programs, and she provides assistance to industry and regulators on severe accident issues. Dr. Rempe has received NRC and Organization for Economic Cooperation and Development (OECD) recognition awards for achievements accomplished in the Three Mile Island Unit -2 Vessel Investigation Project, and in 2011, she was awarded a US DOE Secretarial Honors Award for her contributions in the US response to the events at Fukushima. She holds a BS degree in Nuclear Engineering from the University of Missouri – Rolla and MS and PhD degrees in Nuclear Engineering from the Massachusetts Institute of Technology. Dr. Rempe has authored or co-authored 45 archival peer reviewed journal publications and over 80 peer-reviewed conference papers on reactor safety, severe accident phenomena, high temperature testing, and in-pile instrumentation. She is an inventor/co-inventor on several patents/patents pending. In 2005, Dr. Rempe was elected a Fellow in the American Nuclear Society (ANS); and in 2009, she was elected to the ANS Board of Directors.

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Peter Riccardella

Dr. Peter Riccardella has more than 45 years’ experience working on the structural integrity of nuclear power plant components. He is an authority in the application of fracture mechanics to nuclear pressure vessels and piping and has made significant contributions to the diagnosis and correction of materials degradation concerns at operating plants. He has been a principal investigator on a number of Electric Power Research Institute (EPRI) projects and served more than 20 years as a member of the American Society of Mechanical Engineers (ASME) Subcommittee on Nuclear Power Plant Inservice Inspection.

Dr. Riccardella earned his bachelor's, master's and doctorate degrees in mechanical engineering from Carnegie Mellon University, and is a Fellow and Life Member of the ASME.

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Michael T. Ryan

Michael T. Ryan, Ph. D., C.H.P. received his Ph.D. in 1982 from the Georgia Institute of Technology where he was inducted into the Academy of Distinguished Alumni. He graduated from Lowell Tech with a B.S. in Radiological Health Physics and a M.S. in Radiological Sciences and Protection from the University of Lowell. Dr. Ryan was the 1998 recipient of the Francis Cabot Lowell Distinguished Alumni Award for Arts and Sciences from the University of Massachusetts, Lowell.

Dr. Ryan is an independent consultant in radiological sciences and health physics. He is an adjunct faculty member at Texas A & M University and Vanderbilt University. Dr. Ryan is the Editor-in-Chief of the Journal, Health Physics, and has served in this position since 2000. He also served as Chairman of the External Advisory Board for Radiation Protection at Sandia National Laboratories from 1999-2007.

Dr. Ryan previously worked for Chem-Nuclear Systems, Inc., as Vice President and General Manager for operations and previously as Vice President for Regulatory Affairs for the low-level radioactive waste disposal and service facilities in Barnwell, South Carolina. Dr. Ryan also spent 7 years in operational and environmental health physics at Oak Ridge National Laboratory.

Dr. Ryan served on the Technical Advisory Radiation Control Council for the state of South Carolina for 19 years. He has been a member of the National Council on Radiation Protection and Measurements since 1992. He previously served on the faculty of the College of Health Professions at the Medical University of South Carolina. In 2002, Dr. Ryan was appointed and reappointed in 2006, to serve on the Advisory Committee on Nuclear Waste of the U.S. Nuclear Regulatory Commission. He served three years as Chairman. He also served 9 years, 4 as Chairman, on the Scientific Review Group appointed by the Assistant Secretary of Energy to review the ongoing research in health effects at the former weapons complex sites in the Southern Urals. He has also served on several Committees of the National Academy of Sciences.

In 1989, Dr. Michael Ryan received the Health Physics Society’s Elda E. Anderson Award, which is awarded each year to the one young member who has demonstrated excellence in research, discovery, and/or has contributed significantly to the field of health physics. He is a certified Health Physicist, certified by the American Board of Health Physics, in comprehensive practice. Dr. Ryan is also a diplomat in the American Academy of Health Physics.

Michael T. Ryan, Ph. D., C.H.P. is married to Mary Gene Ryan and lives in Lexington, South Carolina.

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Stephen P. Schultz

Dr. Stephen P. Schultz is a nuclear engineering consultant in Charlotte, N.C., having retired from Duke Energy Corporation after 33 years of leading technical engineering services teams in the nuclear utility business. As a consultant to the International Atomic Energy Agency, he developed guidance on reactor technology assessment and selection for near-term deployment. Dr. Schultz has provided industry technical leadership on task force and working group initiatives, and committees for the Nuclear Energy Institute and the Electric Power Research Institute. He is a registered professional engineer in North Carolina and a lifetime member of the American Nuclear Society. Dr. Schultz earned his Bachelor of Science degree in Engineering from Harvey Mudd College, his Master of Science degree in Nuclear Science and Engineering from Rensselaer Polytechnic Institute and his Doctor of Science degree in Nuclear Engineering from Massachusetts Institute of Technology. He also completed his Master of Business Administration at Northeastern University.

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Gordon R. Skillman

Gordon R. Skillman is an independent consultant in nuclear power plant design and operation with over 45 years of commercial nuclear power experience. He has served on nuclear safety oversight boards and engineering councils for many years and has been directly involved in design, consultation or oversight actions at 27 of the 104 live-core nuclear plants in the United States. Mr. Skillman earned his Reactor Operator’s License and Senior Reactor Operator’s license from the US Atomic Energy Commission in 1967 and 1969 respectively and served on the nuclear merchant ship NS Savannah as a Reactor Operator, Steam Plant Operator, Health Physicist and Water Chemist. On completion of his sailing obligation he joined the Babcock and Wilcox Company where he contributed as an engineer and manager for B&W’s Nuclear Power Generation Division in Lynchburg, Va. and Mannheim, Germany. He was an immediate-responder to the TMI-2 accident and served for 7 years on the stabilization and clean-up of TMI-2 both as a B&W and, later, as a GPUNC employee. At TMI-2 Mr. Skillman was Manager of Recovery Support Engineering and later was Manager of Defueling. Mr. Skillman then served GPUNC as a Director in multiple leadership positions at TMI-1. Following the sale of TMI-1 to AmerGen Mr. Skillman established Skillman Technical Resources Inc. (STR) serving as its President and Principal Officer providing consultation and oversight services to the nuclear industry. Major actions for STR have included response to the Davis Besse Head Event, design and construction of the National Enrichment Facility at Hobbs, New Mexico, and preparation of the application for the renewal amendment of the Design Certification for the US ABWR.

Mr. Skillman received his Bachelor of Science degree from the United States Merchant Marine Academy in 1966. His field of study was Marine Engineering. For the past four decades his primary technical focus has been NSSS design, fluid system design, heat transfer and fluid flow. For the past decade his primary consulting focus has been effectiveness of nuclear-plant engineering organizations and processes. Mr. Skillman is a registered Professional Engineer in Pennsylvania and Virginia.

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Page Last Reviewed/Updated Wednesday, September 24, 2014