Radionuclide retention in geologic media : workshop proceedings - Oskarshamn, Sweden - 7-9 May 2001

Foreword --
PART A. SYNTHESIS OF THE WORKSHOP --
1. Introduction --
Background to and Aims of the Fifth GEOTRAP Workshop --
Scope of the Workshop and Definitions --
Structure of the Synthesis --
2. Workshop Achievements and General Observations --
Workshop Achievements and Observations on Workshop Organisation --
The Importance of an Iterative Approach --
The Importance of Retention Processes --
Development of Undersbtandng of Retention Processes --
Representation of Retention Processes in Performance Assessments --
The Regulatory View of the Representation of Retention Processes --
3. Observations on Specific Retention Processes --
Introductory Comments --
Sorption --
Matrix Diffusion --
Colloid-Facilitated Radionuclide Transport --
Immobilisation --
4. Recommendations --
5. Concluding Remarks --
Annex 1. Structure and Programme of the Workshop --
Annex 2. Conclusions of Working Group 1: Sorption --
Annex 3. Conclusions of Working Group 2: Matrix Diffusion --
Annex 4. Conclusions of Working Group 3: Colloid-Retention Processes --
Annex 5. Conclusions of Working Group 4: Immobilisation --
Annex 6. Conclusions of Working Group 5: Conclusions and Synthesis of GEOTRAP and Proposals for Follow-Up --
PART B. WORKSHOP PROCEEDINGS & nbsp
 --
Session I. Fundamental Understanding of Individual Retention Processes --
How Geologist View Retention by M.J. Heath --
Molecular Scale Obsevations and Models of Sorption Reactions by James A. Davis --
Matrix Diffusion: Heavy-Tailed Residence Time Distributions and Their Influence on Radionuclide Retention by Roy Haggerty --
The Role of Colloids in Radionuclide Tetention by and Transport through Geologic Media by Bruce D. Honeyman --
Immobilisation: Molecular Scale Observations of Processes Relevant to attenuation of Radioactive Contaminants by Susan L.S. Stipp --
Isotope Factionation Effects in Radionuclide Transport in Geologic Disposal of Nuclear Waste by William M. Murphy and David A. Pickett --
Session II. Geologic and Field Evidence for Retention Processes and their Representation in Models --
Evidence for Retention Processes in the Tracer Retention Understanding Experiments (TRUE) by Anders Winberg --
Do We See In Situ Sorption? Can Useful Information Be Derived for Migration Modelling? by Juhani Suksi, Kari Rasilainen, Cecile Le Guern and Timo Ruskeeniemi --
Evidence for Matric Diffusion in the TRUE-1 Block and Aspo Basedon Fracture Characterisation and Modelling of Tracer Tests by Martin Mazurek and Andreas Jakob --
Solute Immobilisation: Observations for Natural Analogue Studies by John A.T. Smellie --
Session III. Consideration and Representation of Retention Processes in Performance Assessments and Justification of Treatment --
The consideration and Representation of Retention Processes in Performance Assessments Carried Out by Waste Management Organisations: What Has Been Done and Why? by Jurg Schneider, Bernhard Schwyn, Piet Zuidema, Hiroyuki Umeki and Paul Smith --
The Consideration and Representation of Retention Processes in Performance Assessment: A Regulatory Perspective by Budhi Sagar and Bo Stromberg --
The Consideration and Representation of Retention Processes in the WIPP Performance Assessment: Justification of Adopted Approaches and Interaction with the Regulator --
Part I. Chemical Retardatiuon of Dissolved Actinides by Laurence H. Brush, Charles R. Bryan, Lucy C. Meigs, Hans W. Papenguth, and Palmer Vaughn --
Part II. EPA Review PRocess and Approval Justification by Charles Byrum and R. Thomas Peake --
PART C. POSTER SESSION --
Effects of Hertogeneous Porosity on Retention: Results from the TRUE Laboratory Experiments by Johan Byegard, Mats Skalberg, Henrik Widestrand, and Eva-Lena Tulborg --
Immobilisation and Retention Processes of Uranium in Tertiary Argillaceous Sediments (Czech Republic) by Ales Laciok, Mirek Hercik, Ulrich Noseck and Thomas Brasser --
Colloid Retention in Aspo Crystalline Rock: A Generic Computational Assessment by Georg A. Lindgren and Vladimir Cvetkovic --
Comparison of Formation Factor Logs Obtained by Electrical Methods In Situ and at Laboratory by Mortin Lofgren, Yvonne Ohlsson and Ivars Neretnieks --
Modelling of Colloid-Facilitated Contaminant Transoprt with the Computer Code TRAPIC: Theoretical Basis and Application by Ulrich Noseck and Dietmar Klotz --
Matrix Diffusion: Through-Diffusion versus Electrical Conductivity Measurements by Yvonne Ohlsson, Martin Lofgren and Ivars Neretnieks --
Discordance in Understanding of Isotope Solute Diffusion and Elements for Resolution by Claudio Pescatore --
Determination of Natural Uranium Concentration in Boom Clay: Effect of Different Extraction Techniques by Lian Wang, M. De Craen, N. Maes, P. De Canniere, M. Put, and A. Dierckx --
List of Participants.