The joint Nagra/JNC Radionuclide Retardation Programme has now been ongoing for 15 years with the main aim of direct testing of radionuclide transport models in as realistic a manner as possible. A large programme of field, laboratory and natural analogue studies has been carried out at the Grimsel Test Site in the central Swiss Alps and the Kamaishi In Situ Test Site in north-east Japan. The understanding and modelling of both the processes and the structures influencing radionuclide transport/retardation in fractured host rocks have matured as has the experimental technology, which has contributed to develop confidence in the applicability of the underlying research models in a repository performance assessment. In this paper, the successes and set-backs of this programme are discussed as is the general approach to the thorough testing of the process models and of model assumptions. In addition, a set of key findings is presented, involving discussions on the enhancement of confidence through the program.
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Nagra, Bericht zur Langzeitsicherheit des Endlagers SMA am Standort Wellenberg, Nagra Technical Report NTB 94-06 (Nagra, Switzerland, 1994).
JNC, H12: Project to Establish the Scientific and Technical Basis for HLW Disposal in Japan, JNC Technical Reports JNC TN1410 2000-001–2000-005 (JNC, Japan, 2000).
W.R. Alexander, M.H. Bradbury, I.G. McKinley, W. Heer, J. Eikenberg and U. Frick, in Scientific Basis for Nuclear Waste Management XV (Mater. Res. Soc. Proc. 257, Pittsburgh, PA, 1992) pp. 721–728.
U. Frick, W.R. Alexander, B. Baeyens, P. Bossart, M.H. Bradbury, Ch. Bühler, J. Eikenberg, Th. Fierz, W. Heer, E. Hoehn, I.G. McKinley and P.A. Smith, The Radionuclide Migration Experiment–Overview of Investigations 1985-1990, Nagra Technical Report NTB 91-04 (Nagra, Switzerland, 1992).
P.A. Smith, W.R. Alexander, H. Umeki, M. Mazurek, W. Heer, B. Baeyens, M.H. Bradbury, I.G. McKinley and W. Kinzelbach, The Radionuclide Migration Experiment–Overview of Investigations 1990-1996, Nagra Technical Report NTB 00-09 (Nagra, Switzerland, in prep).
H. Umeki, K. Hatanaka, W.R. Alexander, I.G. McKinley and U. Frick, in Scientific Basis for Nuclear Waste Management XVIII (Mater. Res. Soc. Proc. 353, Pittsburgh, PA, 1995) pp. 427–434.
W. Heer and P.A. Smith, in Scientific Basis for Nuclear Waste Management XXI (Mater. Res. Soc. Proc. 506, Pittsburgh, PA, 1998) pp. 663–670.
S.M. Pate, I.G. McKinley and W.R. Alexander, in 5th CEC Natural Analogue Working Group Meeting and Alligator Rivers Analogue Project (ARAP) Final Workshop–Proceedings of an International Workshop held in Toledo, Spain, 5-9 October 1992, CEC Nuclear Science and Technology Series EUR15176EN (CEC, Luxembourg, 1994) pp. 321–331.
W.R. Alexander, B. Frieg, K. Ota and P. Bossart, Nagra Bulletin No.27, 43–55 (1996).
J. Eikenberg, M. Rüthi, W.R. Alexander, B. Frieg and T. Fierz, in Scientific Basis for Nuclear Waste Management XXI (Mater. Res. Soc. Proc. 506, Pittsburgh, PA, 1998) pp. 655–662.
B. Frieg, W.R. Alexander, H. Dollinger, C. Bühler, P. Haag, A. Möri, and K. Ota, J. Contam. Hydrol. 35, 115–130 (1998).
K. Ota, K. Amano and T. Ando, in Proceedings of an International Workshop for the Kamaishi In Situ Experiments, Kamaishi, Japan, 24-25 August 1998, JNC Technical Report JNC TN7400 99-007 (JNC, Japan, 1999) pp. 67–76.
JNC, Final Report of Kamaishi In-situ Experiments, JNC Technical Report JNC TN7410 99-001 (JNC, Japan, 1999).
M.H. Bradbury and B. Baeyens, in PSI Annual Report 1992, Annex IV (PSI, Switzerland, 1992) pp. 59–64.
A. Möri, B. Frieg, K. Ota and W.R. Alexander, The In Situ Study of Safety Relevant Radionuclide Retardation in Fractured Crystalline Rock: Implications for Radionuclide Retardation in the Geosphere I, Nagra Technical Report NTB 00-07 (Nagra, Switzerland, in prep).
Nagra, Kristallin-I: Safety Assessment Report, Nagra Technical Report NTB 93-22 (Nagra, Switzerland, 1994).
A. Möri, H. Dollinger, M. Schild, S. Siegesmund, A. Vollbrecht, M. Adler, M. Mazurek, B. Frieg, K. Ota and W.R. Alexander, The In Situ Study of Matrix Diffusion in Fractured Crystalline Rock: Implications for Radionuclide Retardation in the Geosphere II, Nagra Technical Report NTB 00-08 (Nagra, Switzerland, in prep).
K. Ota, Determination of In Situ Connected Porosity: Limitations in the Use of Laboratory-derived Diffusion Parameters, JNC Technical Report (JNC, Japan, in prep).
P. Vilks, J.J. Cramer, T.W. Melnyk, F.W. Stanchell, N.H. Miller and H.G. Miller, In situ Diffusion in Granite: Phase I Final Report, Ontario Power Generation Report 06819-REP-01200-0087-R00 (OPG, Canada, 1999).
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Ota, K., Alexander, W.R., Smith, P.A. et al. Building Confidence in Radionuclide Transport Models for Fractured Rock: The Nagra/JNC Radionuclide Retardation Programme. MRS Online Proceedings Library 663, 1033 (2000). https://doi.org/10.1557/PROC-663-1033