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The modeler's influence on calculated solubilities for performance assessments at the Aspo Hard-rock Laboratory

Materials Research Society Symposium - Proceedings

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Abstract

Four researchers were asked to provide independent modeled estimates of the solubility of a radionuclide solid phase, specifically Pu(OH)4, under five specified sets of conditions. The objectives of the study were to assess the variability in the results obtained and to determine the primary causes for this variability.In the exercise, modelers were supplied with the composition, pH and redox properties of the water and with a description of the mineralogy of the surrounding fracture system A standard thermodynamic data base was provided to all modelers. Each modeler was encouraged to use other data bases in addition to the standard data base and to try different approaches to solving the problem.In all, about fifty approaches were used, some of which included a large number of solubility calculations. For each of the five test cases, the calculated solubilities from different approaches covered several orders of magnitude. The variability resulting from the use of different thermodynamic data bases was in most cases, far smaller than that resulting from the use of different approaches to solving the problem.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
The modeler's influence on calculated solubilities for performance assessments at the Aspo Hard-rock Laboratory
Series title:
Materials Research Society Symposium - Proceedings
Volume
556
Year Published:
1999
Language:
English
Description:
8 p.
First page:
559
Last page:
566
Online Only (Y/N):
N
Additional Online Files(Y/N):
N