scholarly journals Evaluation of Radionuclide Transport: Effect of Radionuclide Sorption and Solubility

1981 ◽  
Vol 11 ◽  
Author(s):  
P. F. Salter ◽  
G. K. Jacobs
Keyword(s):  
Nuclear Waste ◽  
The United States ◽  
Department Of Energy ◽  
Nuclear Waste Repository ◽  
Radionuclide Transport ◽  
Nuclear Wastes ◽  
Hanford Site ◽  
Transport Effect ◽  
Waste Repository ◽  
Engineered Barriers

The current strategy for the permanent isolation of nuclear wastes in the United States involves the storage of these wastes within repositories mined in deep geologic formations. In this disposal strategy, the isolation of nuclear wastes relies on a series of natural and engineered barriers to prevent the unacceptable release of radionuclides to the accessible environment. An integral part of the development of a qualified subsurface nuclear waste repository, therefore, is the assessment of the ability of these barriers to adequately prevent or retard the migration of radionuclides to the accessible environment. The Basalt Waste Isolation Project (BWIP) under guidance from the Department of Energy (DOE) is investigating the feasibility of storing nuclear w-stes in the basalts beneath the Hanford Site.

Strontium-Basalt Reactions Under Nuclear Waste Repository Conditions

1981 ◽  
Vol 6 ◽  
Author(s):  
Sridhar Komarneni
Keyword(s):  
Ion Exchange ◽  
Nuclear Waste ◽  
Confining Pressure ◽  
Main Mechanism ◽  
Nuclear Waste Repository ◽  
Strontium Chloride ◽  
Nuclear Wastes ◽  
Basalt Glass ◽  
Mineral Phases ◽  
Waste Repository

ABSTRACTHydrothermal interactions of Sr as strontium chloride or hydroxide with basalts or basalt phases were investigated at 300°C for 4 and/or 12 weeks under a confining pressure of 30MPa. The nature and extent of Sr immobilization varied with the Sr source and with the basalt or basalt phase which immobilized up to 99.99% of the added Sr. The main mechanism of Sr fixation with basalts seems to be ion exchange when SrCl2 was the Sr source. Among the basalt phases, basalt glass was the most effective for SrCl2 immobilization by probably forming new strontium mineral phases. However, when Sr(OH)2 reacted with basalts or basalt phases Sr was immobilized by the crystallization of strontium aluminosilicates such as SrAl2Si2O8 . These results of Sr-nearfield interactions in a basalt repository indicate that basalt can be a good barrier for Sr migration from nuclear wastes.

Microbial Effects on the Radionuclide Transport in a Deep Nuclear Waste Repository

1992 ◽  
Vol 294 ◽  
Author(s):  
Herve Spor ◽  
M. Trescinski ◽  
M.F. Libert
Keyword(s):  
Nuclear Waste ◽  
Operating Conditions ◽  
Nuclear Waste Repository ◽  
Complexing Agents ◽  
Fungal Culture ◽  
General Effect ◽  
Radionuclide Transport ◽  
Direct Effects ◽  
Engineered Barriers ◽  
Microbial Effects

ABSTRACTThis study deals with the effects of microorganisms on the transport of radionuclides under deep nuclear-waste disposal conditions. Metabolism of a cellulolytic microorganism is studied. Cellulose, as a carbon source, is representative of nuclear waste.A pilot device allows the study of the general effect of microrganisms. Bioleaching of radionuclides by a fungal culture is performed on columns of clay and cement used as engineered barriers. Cesium and Uranium had been incorporated into matrices prior to the tests. Operating conditions have been choosen according to realistic conditions of a deep repository. The production of organic acids by microorganisms is qualitatively and quantitatively determined.In addition, direct effects of microorganisms (biosorption, bioaccumulation) and indirect effects (complexing agents issued from the diodegradation of cellulose) on the transport and/or retardation of radionuclides are studied.

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