Thomas Nicholson is the Senior Technical Advisor for Radionuclide Transport in the Environment, Division of Risk Analysis , Office of Nuclear Regulatory Research (RES), U.S. Nuclear Regulatory Commission (NRC). He has worked at the NRC for 40 years, primarily in RES. His principal responsibility is to provide technical advice to NRC senior management concerning radionuclide migration in the subsurface at NRC-licensed facilities. His work focuses on research in radionuclide transport at nuclear facilities, primarily due to abnormal, accidental releases in the subsurface. He has formulated and directed numerous research studies, as a senior project manager, involving mitigative techniques for groundwater contamination associated with severe nuclear accidents; radionuclide transport in fractured rock; and integration of subsurface monitoring and modeling strategies. He has provided consulting services to the NRC licensing staff and NRC Regional Inspectors dealing with radionuclide releases and environmental assessments. He co-chairs the Federal Work Group on Parameter Estimation and Uncertainty under the Memorandum of Understanding on research in environmental modeling and monitoring (ICEMM). He recently co-edited the American Geophysical Union's (AGU) Special Publication 69 on Groundwater Vulnerability: Chernobyl Nuclear Disaster with Dr. Boris Faybishenko, Lawrence Berkeley National Laboratory. He also co-edited the AGU Geophysical Monograph 42 (Second Edition) on Flow and Transport through Unsaturated Fractured Rock. He holds a B.S. with distinction in geological sciences from Pennsylvania State University, and a M.S. in hydrogeology from Stanford University. At Stanford, he was a student of Professor Irwin Remson in the hydrogeology program. In 1989, he received the Meritorious Service Award for his scientific excellence. He is a registered Professional Geologist in Indiana, and certified Professional Hydrogeologist in the American Institute of Hydrology. He is a member of the AGU, Geological Society of America, International Association of Hydrological Sciences, the International Hydrogeologic Society, and the National Ground Water Association.
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