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The paper describes PEGASUS, a project recently launched by the Commission of the European Communities, within the framework of its 4th R&D programme on management and storage of radioactive waste, involving organisations and research institutes from at least seven member states. The project covers studies of the processes of gas formation and possible gas release from the different waste types, ILW and HLW, under typical repository conditions in suitable geological formations such as clay, salt and granite. Gas generation due to internal radiation in active cemented alpha waste packages and due to external radiation of samples of inactive cements and bitumen containing organic components will be investigated by CEA (France). Effects of microbiological degradation will be studied by CEA and AEA (UK). In situ and laboratory experiments on gas release from salt due to heat and radiolysis, carried out in the Asse salt mine (Germany) and in an irradiation facility at Saclay (France), have already provided much data and more results will become available with the implementation of the HAW Project. Gas transport through engineered barriers has been investigated by Taylor Woodrow (UK) on clay barriers and by AEA on concrete barriers. In Germany (DBE, GSF et al.) experimental studies are starting on gas transport through salt bricks used as components for dams in galleries. Moreover, a study has started on appropriate sealing of HLW emplacement holes. Gas migration through geological formations, in particular clay and salt, will be investigated by SCK/CEN (Belgium) and ANDRA (France). The research on clay includes laboratory testing on Boom clay samples, as well as in situ gas injection experiments in the underground facility at Mol. Regarding salt, experiments will be carried out in the potash mine in Alsace (France).

Additional information

Authors: HAIJTINK B, CEC Bruxelles (BE);VON MARAVIC H, CEC Bruxelles (BE)
Bibliographic Reference: Paper presented: NEA Workshop on Gas Generation and Release from Radioactive Waste Repositories, Aix-en-Provence (FR), Sept. 23-26, 1991
Availability: Available from (1) as Paper EN 36441 ORA
Record Number: 199111537 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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