English Abstract The National Institute of Public Health and
Environmental Protection (RIVM) in The Netherlands is participating in the
INTRAVAL project for validation of groundwater transport models, used in
safety assessment studies on geological disposal of radioactive wastes. One
of the testcases tackled by the RIVM project-team is test-case 8 on the
Alligator Rivers Koongarra Ore Deposits. The aim of studying this test-case
is to increase confidence in the ability of the METROPOL-code, developed by
RIVM, to simulate groundwater flow and radionuclide migration in an
inhomogeneous and anisotropic, porous system. Within phase 1 of the
INTRAVAL project only a preliminary attempt was made to model the complex
situation represented in this test-case. Geohydrological data have been
analysed and construction of a three-dimensional geohydrological model of
Ore Body 1 has been started. Modelling of the geohydrology of the site and,
depending on time and manpower available, also transport of radionuclides as
well as geochemical processes will be continued in phase 2 of the INTRAVAL
project in close cooperation with the Alligator Rivers Analogue
Project.
