The chemical composition of ambient groundwater for a geological, high level radioactive waste repository is of crucial significance to issues such as radioelement solubility limits, sorption, corrosion of the overpack, behavior of compacted clay buffers, and many other factors involved in repository safety assessment. At this time, there are no candidate repository sites established in Japan for the geological disposal of high-level radioactive waste, and only generic rock formations are under consideration. It is important that a small, but representative set of groundwater types be identified so that defensible models and data for generic repository performance assessment can be established. Over 15,000 separate analyses of Japanese groundwaters have been compiled into a data set for the purpose of evaluating the range of geochemical conditions for waste repositories in Japan. This paper demonstrates the use of a multivariate statistical analysis technique, principal component analysis (PCA), to derive a set of statistically based, representative groundwater categories from the multiple chemical components and temperature that characterize the deep Japanese groundwater analyses. PCA also can be used to guide the selection of groundwaters that could be used in scenario analyses of future geological events in Japan.
This is a preview of subscription content, access via your institution.
Buy single article
Instant access to the full article PDF.
Tax calculation will be finalised during checkout.
Piper, A. M., “A Graphic Procedure in the Geochemical Interpretation of Water Analyses,” Trans. Ami. Geophys. Union, Vol. 25. 1944.
Zaporosec A. M., “Graphical Interpretation of Water Quality Data,” Groundwater, Vol. 10, # 2., 1972.
Lawrence, F. W. and S. B. Upchurch, “Identification of Recharge Areas Using Geochemical Factor Analysis,” Groundwater, V. 20, # 6, 1982.
Lawrence, F. W. and S. B. Upchurch, “Identification of Geochemical Patterns in Groundwater by Numerical Analysis,” Proc. 12th Annual Symnp. Advances in Groundwater Hydrology, Am. Water Resources Assoc., Washington, D. C., 1976.
Dalton, M. G. and S. B. Upchurch, “Interpretation of Hydrochemical Facies by Factor Analysis,” Groundwater, V. 16, # 4, 1978.
Smellie, J. A. T. and M. Laaksoharju, The Aspo Hard Rock Laboratory: Final Evaluation of the Hydrogeochernical Pre-Investigations in Relation to Existing Geologic and Hydraulic Conditions, SKB Technical Report 92-31, Swedish Nuclear Fuel and Waste Management Company, Stockholm, Sweden, 1992.
Cave M. and R. Metcalfe, “Multivariate Statistical Analysis of Sellafield Groundwater Composition Data,” British Geological Survey Analytical Geochemistry Series Technical Report, WI/95/13C, 1995.
JNC, Geostatistical Analysis of Groundwater Chemistry in Japan: Evaluation of the Base Case Groundwater Data Set, JNC TN8400 99-023, Tokai Works, JNC, Tokyo, Japan, 1999.
Pirouette® [Multivariate Data Analysis for IBC PC Systems] User’s Manual. Pirouette® is available from Info Metrix Inc., P. O. Box 1528, Woodinville, WA 98071.
About this article
Cite this article
Sasamoto, H., Salter, P., Apted, M. et al. Principal Component Analyses of Potential Repository Groundwaters. MRS Online Proceedings Library 556, 575 (1998). https://doi.org/10.1557/PROC-556-575