Radiological performance assessment for the E-Area vaults at the Savannah River Site; Part 2, Simulation of contaminant migration in the far-field

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Authors:Hiergesell, R. A.; Yu, A. D.; Cook, J. R.; McDowell-Boyer, L. M.; Kearl, P. M.
Corporate Authors:Westinghouse Savannah River, Aiken, SC, performer
Source:No.WSRC-MS-94-082, CONF-940456-9-PT.2, 9p. Availability: National Technical Information Service, (703)605-6000, order number DE94007288NEG, Springfield, VA, United States
Publication Date:1994
Note:In English. Presented at the 1994 Society for Computer Simulation multiconference, San Diego, CA, Apr. 11-15, 1994. Contract AC09-89SR18035
Summary:Two papers presented in this session cover a numerical simulation of radionuclide migration beneath Savannah River Site's E-Area Vaults (EAV) within the unsaturated and saturated flow fields. This paper (Part II) describes the simulation of radionuclide migration within the saturated zone. Simulations were conducted for 23 radionuclides which are planned to be disposed within the EAV Facility (EAVF). Part I of this study used a nominal starting inventory of 1 Curie for each radionuclide in each group of vaults. Output concentrations from the near-field model were utilized as input for the far-field, or saturated zone transport model. Mechanisms for the migration of radionuclides in the saturated zone are convection and diffusion. Other mechanisms impacting migration of radioisotopes are radioactive decay and adsorption. A partition coefficient (Kd) is used in this model to account for other geochemical effects such as solubility, chemical speciation and colloid formation. Results of simulations indicate that contaminants migrate laterally toward discharge zones at local streams. Groundwater concentrations were calculated for the 23 radionuclides and were converted to doses to man for a groundwater pathway scenario in which an individual ingests 2 liters (L) of groundwater daily. Since calculated doses are in terms of a unit disposal quantity, they will be used to compute the disposal limits for each radionuclide. These limits, and hence the vault loading capacity, will be maximized while maintaining acceptable levels of exposure to individuals exposed through the different pathways. The source term for contaminants at the water table was generated by the vadose zone model described in Part I of this paper and entered as fluxes over time.
Subjects:Ground water; Isotopes; Migration of elements; Models; Numerical models; Radioactive isotopes; Reclamation; Remediation; Saturated zone; Simulation; Site exploration; Transport; Unsaturated zone; Aiken County South Carolina; Savannah River Site; South Carolina; United States
Coordinates:N331000 N335200 W0811200 W0820300
Record ID:1997001473
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute. Reference includes data from NTIS database, National Technical Information Service, Springfield, VA, United States
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