Scientific interpretation of the first years of the PRACLAY Heater test

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    In the HADES underground research facility (URF) in Mol, Belgium, a large-scale PRACLAY Heater test isbeing carried out by EIG EURIDICE as part of the RD&D programme of ONDRAF/NIRAS on geological disposal.The test aims to examine, at a scale and in conditions that are representative of a real repository, thecombined impact on the Boom Clay of hydro-mechanical disturbances caused by the gallery constructionand a large-scale thermal load due to the disposal of heat emitting high-level waste in this deep clayformation, to confirm and refine at a large scale the Boom Clay THM behaviour obtained from the laboratorycharacterisation programme and small-scale in situ tests, and thus to enhance our knowledge regarding thecapability of the Boom Clay to retain its safety-relevant performance after THM perturbations.This report aims to synthesize with a clear context the scientific interpretations of the observations madefor the PRACLAY Heater test. The report consists of four chapters. After a short introduction in Chapter 1,Chapter 2 describes briefly the set-up of the PRACLAY Heater test and the main observations made fromthe nearly six years of heating. Chapter 3 firstly presents the theoretical framework used in the numericalmodelling, then introduces all the relevant modelling work in chronological order. The evolvement of themodels, refining of the model parameter values and the resulting THM characterizations of the Boom Claycan be clearly traced in this chapter. The last chapter 4 concludes this report and presents the researchperspectives.
    Original languageEnglish
    PublisherESV Euridice GIE
    Number of pages161
    StatePublished - 15 Mar 2021

    Publication series

    NameSCK CEN Reports
    No.EUR-PH-20-058 /ER

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