Characterization, Modeling, Monitoring and Remediation of Radionuclides in the Subsurface
Abstract
NRC sponsors research to identify and assess characterization, modeling, monitoring and remediation methods used to quantify and evaluate radionuclide release and migration in the subsurface. The need for and selection of remediation methods is based on a dose assessment to determine compliance with regulatory criteria. If remediation is warranted, the choice of remediation methods is based upon site- and source-characterization data. This data is integrated in a Conceptual Site Model (CSM). The assumptions and parameterization of the CSM are tested using a program of field tests and confirmatory monitoring. In particular, the features, events and processes in the unsaturated zone where many leaks and spills originate need characterization and confirmatory monitoring. The choice of the remediation method, if warranted, is based upon the confirmed CSM and the monitoring baseline. Remediation strategies being considered are: in situ bioremediation; pump, treat, monitor and release; monitored natural attenuation. Successful remediation strategies include monitoring programs to determine their efficacy. This monitoring is coupled to performance assessment models using performance indicators (PIs). These PIs provide a measurable indication of remediation performance, and are derived from analysis of the CSM and the hydrologic, chemical and microbial functions of the chosen remediation method. Case studies illustrate these observations and provide detailed examples of CSMs and PIs.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2009
- Bibcode:
- 2009AGUFM.H23H..07N
- Keywords:
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- 1832 HYDROLOGY / Groundwater transport;
- 1847 HYDROLOGY / Modeling;
- 1848 HYDROLOGY / Monitoring networks;
- 1875 HYDROLOGY / Vadose zone