skip to main content

DOE PAGESDOE PAGES

This content will become publicly available on October 13, 2016

Title: Modelling radionuclide transport in fractured media with a dynamic update of Kd values

Radionuclide transport in fractured crystalline rocks is a process of interest in evaluating long term safety of potential disposal systems for radioactive wastes. Given their numerical efficiency and the absence of numerical dispersion, Lagrangian methods (e.g. particle tracking algorithms) are appealing approaches that are often used in safety assessment (SA) analyses. In these approaches, many complex geochemical retention processes are typically lumped into a single parameter: the distribution coefficient (Kd). Usually, the distribution coefficient is assumed to be constant over the time frame of interest. However, this assumption could be critical under long-term geochemical changes as it is demonstrated that the distribution coefficient depends on the background chemical conditions (e.g. pH, Eh, and major chemistry). In this study, we provide a computational framework that combines the efficiency of Lagrangian methods with a sound and explicit description of the geochemical changes of the site and their influence on the radionuclide retention properties.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [1] ;  [4]
  1. AMPHOS 21 Consulting S.L., Barcelona (Spain)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Posiva Oy, Eurajoki (Finland)
  4. Swedish Nuclear Fuel and Waste Management Company, Stockholm (Sweden)
Publication Date:
OSTI Identifier:
1265916
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Computers and Geosciences
Additional Journal Information:
Journal Volume: 86; Journal ID: ISSN 0098-3004
Publisher:
Elsevier
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES radionuclide transport; retention properties; background geochemistry; distribution coefficient