Large-Scale Gas Generation Experiment

Updated June 1, 2014

Teollisuuden Voima Oy (TVO) launched a Large-Scale Gas Generation Experiment (GGE) in 1997 to investigate the gas generation from the low-level maintenance waste disposed of in an underground repository. The principal gas generating processes are the microbial activity and corrosion of metals. The experiment is running.

The start-up of the GGE was supported by the European Commission within the PROGRESS project. The principal participating organisations are currently
            TVO (owner and operator of the experiment)
            Safram Oy (consultant, working for TVO)
            VTT Biotechnology (expertise on microbiology, working for TVO)
            Nexia Solutions Ltd (modelling of the experiment with the Generalised Repository Model), reorganized to National Nuclear Laboratory UK

Recent developments:

The experimental set-up was modelled by Nexia Solutions Ltd using their Generalised Repository Model. The work was presented at the MRS 2005 symposium on the Scientific Basis for Nuclear Waste Management in Ghent Belgium in September 2005. A more comprehensive description of the work is found in:

Small J., Nykyri M., Helin M., Hovi U., Sarlin T. and Itävaara M., Experimental and modelling investigations of the biogeochemistry of gas production from low and intermediate level radioactive waste. Applied Geochemistry, Elsevier, Volume 23, issue 6, June 2008.

Return to Safram home page.

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Figure.   The experimental equipment is located in the VLJ Repository at the Olkiluoto NPP site. It consists of

o  a 20 m3 tank filled with compacted waste material in steel drums, a large concrete container and water,

o  an automatic online monitoring and control system,

o  a manual sampling system for gas, liquid and solids and

o  a remotely operated process computer.