Gas-induced Radionuclide Transport in Disturbed and Undisturbed Boom Clay and Boom Clay–Bentonite Interfaces

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Abstract

In deep geological repositories, gas can be generated by different mechanisms like anaerobic corrosion, radiolysis and microbial degradation. If the gas generation rate is larger than the capacity for diffusive transport of dissolved gas, a free gas phase will be formed, eventually leading to gas breakthrough events. Depending on the timing of gas breakthrough, dissolved radionuclides (RN) and contaminants could be driven out of the clay faster than the normally expected diffusive transport. A column experiment was designed in which a water saturated clay core is put directly on top of a thin BC core which has been previously saturated with a tracer solution (0.01 mol/l NaI). A He gas pressure is applied and stepwise increased. Upon gas breakthrough, the water on top of the column is expelled and analysed for its iodide content. The measured concentration io-dide is linked to the amount of NaI saturated pore water that was displaced. Based on the obtained results, it can be concluded that the transport of radionuclides and con-taminants due to a gas breakthrough is indeed possible but seems very limited.

Details

Original languageEnglish
Title of host publicationConference Proceedings EURADWASTE ’13
Place of PublicationSpain
Pages509-513
Volume1
Publication statusPublished - Dec 2014
Event8th EC Conference on the Management of Radioactive Waste, Euradwaste'13 - Co-organised by the European Commission and the Lithuanian EU Presidency 2013, Vilnius, Lithuania
Duration: 14 Oct 201317 Oct 2013

Conference

Conference8th EC Conference on the Management of Radioactive Waste, Euradwaste'13
CountryLithuania
CityVilnius
Period2013-10-142013-10-17

Keywords

  • gas migration, Boom Clay, radionuclide transport

ID: 129691