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The development and use of T2GGM: a gas modelling code for the postclosure safety assessment of opg's proposed l&ilw deep geologic repository, Canada

Suckling, Paul, Calder, Nicola, Humphreys, Paul, Fraser, King and Leung, Helen (2009) The development and use of T2GGM: a gas modelling code for the postclosure safety assessment of opg's proposed l&ilw deep geologic repository, Canada. In: 2009 Proceedings of the ASME 12th International Conference on Environmental Remediation and Radioactive Waste Management-CD-ROM. ASME, New York, USA, pp. 1-10. ISBN 978079183865X

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    Abstract

    As part of the postclosure safety assessment of Ontario
    Power Generation’s (OPG’s) proposed Deep Geologic
    Repository (DGR) for Low and Intermediate Level Waste
    (L&ILW) at the Bruce site, Ontario, a Gas Generation Model
    (GGM) has been developed and used to model the detailed
    generation of gas within the DGR due to corrosion and
    microbial degradation of the organics and metals present.
    The GGM is based on a kinetic description of the various
    microbial and corrosion processes that lead to the generation
    and consumption of various gases. It takes into account the
    mass-balance equations for each of the species included in the
    model, including three forms of organic waste (cellulose, ionexchange
    resins, and plastics and rubbers), four metallic waste
    forms and container materials (carbon and galvanised steel,
    passivated carbon steel, stainless steel and nickel-based alloys,
    and zirconium alloys), six gases (CO2, N2, O2, H2, H2S, and
    CH4), five terminal electron acceptors (O2, NO3
    -, Fe(III), SO4
    2-,
    and CO2), five forms of biomass (aerobes, denitrifiers, iron
    reducers, sulphate reducers, and methanogens), four types of
    corrosion product (FeOOH, FeCO3, Fe3O4, and FeS), and water.
    The code includes the possibility of the limitation of both
    microbial and corrosion reactions by the availability of water.
    The GGM has been coupled with TOUGH2 to produce
    T2GGM; a code that models the generation of gas in the
    repository and its subsequent transport through the geosphere.
    T2GGM estimates the peak repository pressure, long time
    repository saturation and the total flux of gases from the
    geosphere.
    The present paper describes the development of T2GGM
    and the numerical modelling work undertaken to calculate the
    generation and build-up of gas in the repository, the two-phase
    exchange of gas and groundwater between the repository and
    the surrounding rock, and between the rock and the surface
    environment. The results have been used to inform the safety
    assessment modelling.

    Item Type: Book Chapter
    Additional Information: Reproduced by permission of ASME © ASME http://asmedl.org/ Anyone who wishes to use any part of this article must contact ASME for permission at permissions@asme.org
    Subjects: Q Science > QR Microbiology
    Schools: School of Applied Sciences
    Related URLs:
    Depositing User: Paul Humphreys
    Date Deposited: 04 Nov 2010 14:13
    Last Modified: 16 Nov 2010 16:50
    URI: http://eprints.hud.ac.uk/id/eprint/8928

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