Radionuclide Transport Modelling in Fissured Zones and Channels

AbstractRadionuclides escaping from a repository for high level nuclear waste in crystalline rock may eventually be carried by the flowing water in fissure zones. In such zones the rock is broken in blocks of varying sizes and shapes. Also, the water velocity may vary very much along the flow path. The integrated finite difference method (IFDM) is proposed for numerical calculations of radionuclide transport in such zones. A method for lumping blocks of various sizes and shapes into a single PSEUDOBODY is tested by comparing it with an exact analytical solution which can account for the diffusion into blocks of any size distribution. The errors obtained in using the PSEUDOBODY-approach are found to be small. Furthermore, a method for determining an “average” Peclet number in a strongly varying velocity field is tested and found to give comparatively small errors.

Preliminary Post-Emplacement Safety Analysis of the Subseabed Disposal of High-Level Radioactive Waste

MRS Proceedings ◽

10.1557/proc-26-1061 ◽

1983 ◽

Vol 26 ◽

Cited By ~ 1

Author(s):

Maureen F. Kaplan ◽

Charles M. Koplik

Keyword(s):

Radioactive Waste ◽

Nuclear Waste ◽

North Pacific ◽

Sensitivity Analyses ◽

Radionuclide Transport ◽

Radiological Hazard ◽

Systems Model ◽

High Level ◽

Central North Pacific

ABSTRACTThe radiological hazard from the disposal of high-level nuclear waste deep within the ocean sediments is evaluated, on a preliminary basis, for locations in the central North Pacific and in the northwestern Atlantic. Radionuclide transport in the sediment and water column and by marine organisms is considered. Peak doses to an individual are approximately five orders of magnitude below background levels for both places. Sensitivity analyses for several imporLant aspects of the post-emplacement systems model are described.

Updated Simulations of the FEBEX Full-Scale In-situ Heater Test for High-Level Nuclear Waste Disposal in Crystalline Rock.

10.2172/1832730 ◽

2020 ◽

Author(s):

Teklu Hadgu ◽

Thomas Dewers ◽

Edward Matteo ◽

Steven Gomez

Keyword(s):

Nuclear Waste ◽

Waste Disposal ◽

Nuclear Waste Disposal ◽

Crystalline Rock ◽

Full Scale ◽

Approaches to confirmatory testing of a groundwater flow model for sparsely fractured crystalline rock, exemplified by data from the proposed high-level nuclear waste repository site at Forsmark, Sweden

Hydrogeology Journal ◽

10.1007/s10040-013-1079-8 ◽

2013 ◽

Vol 22 (2) ◽

pp. 333-349 ◽

Cited By ~ 12

Author(s):

Sven Follin ◽

Lee Hartley

Keyword(s):

Groundwater Flow ◽

Nuclear Waste ◽

Flow Model ◽

Crystalline Rock ◽

Nuclear Waste Repository ◽

Groundwater Flow Model ◽

Confirmatory Testing ◽

Waste Repository ◽

High-level nuclear waste management: a geochemical perspective

Canadian Journal of Civil Engineering ◽

10.1139/l89-080 ◽

1989 ◽

Vol 16 (4) ◽

pp. 498-503

Author(s):

T. T. Vandergraaf

Keyword(s):

Contaminant Transport ◽

Nuclear Waste ◽

Fission Products ◽

Crystalline Rock ◽

Nuclear Waste Management ◽

Geochemical Processes ◽

Fracture Systems ◽

High Level ◽

Canada Limited

Atomic Energy of Canada Limited is investigating the concept of the disposal of high-level radioactive waste in an underground vault in an intrusive crystalline rock formation. The environmental impact of such a disposal is, to a large extent, dictated by geochemical processes involving rock-forming minerals, groundwater, and fission products and actinides in the waste. These various geochemical processes impact on the transport of contaminants, including radionuclides and chemically toxic elements, from a used-fuel disposal vault towards the biosphere. The extent and importance of the geochemical processes on contaminant transport are discussed. The predominant processes controlling the velocity of contaminant transport are the various geochemical interactions of the dissolved contaminant species with the minerals lining the surfaces of conductive fractures and fracture systems. Key words: radionuclide, uranium, nuclear contaminant, transport, sorption, diffusion, geochemistry, fission products, granite.

A transmissivity model for deformation zones in fractured crystalline rock and its possible correlation to in situ stress at the proposed high-level nuclear waste repository site at Forsmark, Sweden

Hydrogeology Journal ◽

10.1007/s10040-013-1078-9 ◽

2013 ◽

Vol 22 (2) ◽

pp. 299-311 ◽

Cited By ~ 19

Author(s):

Sven Follin ◽

Martin Stigsson

Keyword(s):

Nuclear Waste ◽

Crystalline Rock ◽

In Situ Stress ◽

Nuclear Waste Repository ◽

Waste Repository ◽

The Geomicrobiology of Nuclear Waste Disposal

MRS Proceedings ◽

10.1557/proc-26-487 ◽

1983 ◽

Vol 26 ◽

Cited By ~ 8

Author(s):

Julia M. West ◽

Ian G. McKinley

Keyword(s):

Waste Management ◽

Nuclear Waste ◽

Waste Disposal ◽

Microbial Contamination ◽

Nuclear Waste Disposal ◽

Nuclear Waste Management ◽

Radionuclide Transport ◽

The Uk ◽

ABSTRACTThe geomicrobiology of high-level nuclear waste disposal is a new field in the area of nuclear waste management. Until recently the likelihood of microbial contamination in a deep repository had not been considered, but possible biogeochemical effects of repository materials, radionuclide transport and groundwater chemistry must now be realistically assessed.This work was funded by the UK Department of the Environment and the Commission of the European Communities.