For the option of a deep geological repository for high level waste, several potential sources of gases were identified: i.e. the anaerobic corrosion of iron, tbe degradation of organic materials, tbe generation by gamma radiolysis and the gas present as such in tbe waste packages. Of those gases, hydrogen is certainly tbe gas which can be released in tbe potentially Iargest amount. For tbe safety evaluation of a repository, it is necessary to know tbe effects of gases on tbe host rock. The primary objective of tbe MEGAS project is to understand tbe consequences of gas generation in a clay host roele. The final objective of this project is to validate a gas migration mode! and to confirrn our understanding using an in situ gas injection experiment performed in tbe HADES underground research facility at SCKoCEN, Moi Belgium. Witbin MEGAS tbe following phenomena are studied: chemical reaction, diffusion, two-phase flow and the creation of preferential patbways. The MEGAS project is performed under tbe CEC umbrella project PEGASUS. Witbin tbe MEGAS project INTERA is performing tbe main modelling work. The SCK oCEN is responsible for tbe· chemical reaction, diffusion, uniaxial flow and in situ experiments and for tbe coordination ofthe project. BGS is perforrning geotechnically based triaxial gas flow experiments. ISMES has executed similar experiments at higher temperature. Tliis report gives an overview of the results af tbe modelling and experimental work performed during phase l of tbe project.
MEGAS Modelling and Experiments on Gas Migration in Repository Host Rocks
FIORAVANTE, Vincenzo;
1992
Abstract
For the option of a deep geological repository for high level waste, several potential sources of gases were identified: i.e. the anaerobic corrosion of iron, tbe degradation of organic materials, tbe generation by gamma radiolysis and the gas present as such in tbe waste packages. Of those gases, hydrogen is certainly tbe gas which can be released in tbe potentially Iargest amount. For tbe safety evaluation of a repository, it is necessary to know tbe effects of gases on tbe host rock. The primary objective of tbe MEGAS project is to understand tbe consequences of gas generation in a clay host roele. The final objective of this project is to validate a gas migration mode! and to confirrn our understanding using an in situ gas injection experiment performed in tbe HADES underground research facility at SCKoCEN, Moi Belgium. Witbin MEGAS tbe following phenomena are studied: chemical reaction, diffusion, two-phase flow and the creation of preferential patbways. The MEGAS project is performed under tbe CEC umbrella project PEGASUS. Witbin tbe MEGAS project INTERA is performing tbe main modelling work. The SCK oCEN is responsible for tbe· chemical reaction, diffusion, uniaxial flow and in situ experiments and for tbe coordination ofthe project. BGS is perforrning geotechnically based triaxial gas flow experiments. ISMES has executed similar experiments at higher temperature. Tliis report gives an overview of the results af tbe modelling and experimental work performed during phase l of tbe project.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
