TH28  Ground-Water Monitoring and Remediation at Operating and Decommissioning NPP Sites

The session’s objective is to examine ground-water monitoring and remediation methods that have been applied at operating and decommissioning nuclear power plant sites. These experiences are valuable in assessing the significance of residual radioactivity1 in the subsurface, and helping to determine the future need and timing for remediation. The technical challenge is to characterize and develop a conceptual site model of the subsurface flow and transport properties and conditions affecting the migration of residual radionuclides to offsite receptors. This information coupled to radionuclide release scenarios is important for assessing and selecting the appropriate monitoring and remediation methods to minimize subsurface contamination during operations, and for understanding, and possibly reducing, the activities and financial resources needed during decommissioning. The session will highlight information on EPRI’s ground-water and soil remediation guidelines and NRC’s regulatory guidance. In addition, it will provide published case-study examples including remediation methods from industry, both domestic and international. The session format will be technical discussions by a panel of industry, State, and Federal experts having experiences in developing, implementing,and reviewing ground-water monitoring and remediation programs. Takeaway messages include information on how to monitor and assess residual subsurface radioactivity and what numerical codes can be employed to estimate offsite radionuclide discharges. This information and insights from accomplished remediation programs can assist others in their selection and evaluation of the efficacy of remediation methods to help preclude significant offsite discharges of radionuclides.

1 Residual radioactivity means radioactivity in structures, materials, soils, groundwater, and other media at a site resulting from activities under the licensee’s control (from 10 CFR 20.1003). The regulatory issue is minimization of ground-water contamination as specified in 10 CFR 20.1406.

  • Thomas J. Nicholson, Senior Technical Advisor for Radionuclide Transport in the Environment, Division of Risk Analysis, RES/NRC tel: 301-415-2471, e-mail:
  • William Ford, John Adams and Michael Smith, NRR/NRC
  • Jack Parrott, Paul Michalak, Boby Abu-Eid, Hans Arlt, and Marlayna Vaaler, NMSS/NRC
  • Mark Fuhrmann and Cyndi Jones, RES/NRC
  • Daniel Barnhurst, NRO/NRC
  • Meredith Carr, Hydrologist, Division of Risk Analysis, RES/NRC tel: 301-415-6322, e-mail:

Page Last Reviewed/Updated Friday, June 09, 2017