Hostname: page-component-cd9895bd7-q99xh Total loading time: 0 Render date: 2024-12-27T13:41:55.032Z Has data issue: false hasContentIssue false
  • English
  • Français

Kd setting approach through semi-quantitative estimation procedures and thermodynamic sorption models: A case study for Horonobe URL conditions

Published online by Cambridge University Press:  30 June 2014

Yukio Tachi ,
Michael Ochs ,
Tadahiro Suyama  and
David Trudel
Yukio Tachi
Affiliation:
Japan Atomic Energy Agency, 4-33, Muramatsu, Tokai, Ibaraki, 319-1194, Japan
Michael Ochs
Affiliation:
BMG Engineering Ltd, Ifangstrasse 11, CH-8952 Schlieren-Zürich, Switzerland
Tadahiro Suyama
Affiliation:
Japan Atomic Energy Agency, 4-33, Muramatsu, Tokai, Ibaraki, 319-1194, Japan
David Trudel
Affiliation:
BMG Engineering Ltd, Ifangstrasse 11, CH-8952 Schlieren-Zürich, Switzerland
Get access

Abstract

The use of generic sorption data in PA requires the transfer of the data to the PA-specific conditions. A site-specific Kd setting approach for PA calculations was tested, comparing two data transfer procedures. First transfer of sorption data can be done through semi-quantitative estimation procedures, by considering differences between experimental and PA geochemical conditions (sorption capacity, radionuclide speciation, competitive reactions, etc.). On the other hand, thermodynamic sorption models allow to estimate Kd variations directly, based on quasi-mechanistic understanding. The present paper focuses on illustrating example calculations regarding the derivation of Kd values, and their uncertainties, of Cs, Ni, Am and Th, for the mineralogical and geochemical conditions of the mudstone system at the Horonobe URL. Clay minerals (illite and smectite) were considered as sorption-relevant minerals in all cases. The Kd setting results were compared with Kd measured for Horonobe mudstone by batch experiments. The results indicate that Kd can be quantitatively evaluated from generic sorption data when adequate data and models are available. The careful evaluation and conjunctive use of calculated and measured Kd values can enhance the reliability of Kd setting and uncertainty assessments.

Keywords

waste managementadsorptiongeologic
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1665: Symposium NW – Scientific Basis for Nuclear Waste Management XXXVII , 2014 , pp. 149 - 155
Copyright
Copyright © Materials Research Society 2014 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Bradbury, M.H., Baeyens, B., PSI Bericht Nr. 03-08 (2003).Google Scholar
Ochs, M., Talerico, C., Sellin, P., Hedin, A., Phys. Chem. Earth, 31, 600–609 (2006).CrossRefGoogle Scholar
OECD/NEA, NEA Sorption Project Phase III report (2012).Google Scholar
JAEA, Assessment Methodology of Chemical Effects on Geological Disposal System (2011, 2012).Google Scholar
Ochs, M., Tachi, Y., Trudel, D., Suyama, T., JAEA-Research 2012-044 (2013).Google Scholar
Tachi, Y., Yotsuji, K., Seida, Y., Yui, M., Geochim. Cosmochim. Acta 75, 6742–6759 (2011).CrossRefGoogle Scholar
Tachi, Y., Suyama, T., Ochs, M., Ganter, C., JAEA-Data/Code 2010-03 (2011).Google Scholar
Kitamura, A., Fujiwara, K., Doi, R., Yoshida, Y., Mihara, M., Terashima, M., Yui, M., JAEA-Data/Code 2009-024 (2010).Google Scholar
Wanner, H., Albinsson, Y., Wieland, E., Fresenius J. Anal. Chem. 354, 763–769 (1996).Google Scholar
Bradbury, M.H., Baeyens, B., J. Contam. Hydrol. 42, 141–163 (2000).CrossRefGoogle Scholar
Parkhurst, D.L., Appelo, C.A.J., User’s guide to PHREEQC (ver.2) (1999).Google Scholar
Wahlberg, J.S., Fishman, M.J., USGS Bull. 1140-A (1962).Google Scholar
Tachi, Y., Yotsuji, K., Seida, Y., Yui, M., Mater. Res. Soc. Symp. Proc. 1193, 545–552 (2009).CrossRefGoogle Scholar
Poinssot, C., Baeyens, B., Bradbury, M.H., PSI Bericht Nr. 99-06 (1999).Google Scholar
Davis, J.A., Coston, J.A., Kent, D.B., Fuller, C.C., Environ. Sci. Technol. 32, 2820–2828 (1998).10.1021/es980312qCrossRefGoogle Scholar
Bradbury, M.H., Baeyens, B., Geochim. Cosmochim. Acta, 69, 875–892 (2005).CrossRefGoogle Scholar
Tertre, E., Berger, G., Castet, S., Loubet, M., Giffaut, E., ibid, 69, 4937–4948 (2005).Google Scholar
Bradbury, M.H., Baeyens, B., ibid, 73, 990–1013 (2009).Google Scholar
Gorgeon, L., L. Ph.D. thesis. Université Paris 6 (1994).Google Scholar
Marques Fernandes, M., Baeyens, B., Bradbury, M.H., Radiochim. Acta 96, 691–697 (2008).10.1524/ract.2008.1555CrossRefGoogle Scholar