The THM boundary conditions control in the design of the large scale in situ PRACLAY heater test

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Abstract

In Belgium, the Boom Clay was selected as a potential host formation for the disposal of the HLW nuclear wastes. In order to demonstrate at large scale the suitability of the Boom Clay as a host rock, in terms of performance of the disposal system, to undergo the thermal load induced by the HLW, a large scale in-situ heater test, called PRACLAYheater test is being designed and will be conducted in the Underground Laboratory HADES, excavated at 223 m depth in the Boom Clay near Mol city. Numerical THM (Thermal-Hydro-Mechanical) scoping calculations revealed that the THM boundary conditions imposed by the repository design influence highly the THM disturbances into the host rock. Consequently, it was decided to perform the PRACLAYin situ heater test under most penalizing THM conditions to build confidence on the performance of the Boom Clay as a host rock. Based on numerical calculations, this paper presents detailed considerations of the THM boundary conditions impact on the design of the PRACLAYheater test. It is believed that the outcome of the PRACLAYheater test will be an important milestone for the Belgian repository design.

Details

Original languageEnglish
Title of host publicationImpact of thermo-hydro-mechanical chemical (THMC) processes on the safety of underground radioactive waste repositories. Proceedings of the European Commission TIMODAZ-THERESA International Conference, Luxembourg, 29 September – 1 October 2009
Place of PublicationBrussels, Belgium
Pages385-390
Publication statusPublished - Dec 2012
EventInternational conference and workshop "Impact of Thermo-Hydro-Mechanical-Chemical (THMC) processes on the safety of underground radioactive waste repositories" - European Commission, Luxembourg, Luxembourg
Duration: 29 Sep 20091 Oct 2009

Publication series

NameEUR report
NumberEUR 25527 EN

Conference

ConferenceInternational conference and workshop "Impact of Thermo-Hydro-Mechanical-Chemical (THMC) processes on the safety of underground radioactive waste repositories"
CountryLuxembourg
CityLuxembourg
Period2009-09-292009-10-01

Keywords

  • large scale in situ test, Praclay heater test, Boom clay, Theromo-Hydro-Mechanical coupling, boundary conditions, impermeable, scoping calculations, HLW repositroy design

ID: 63310