Tritiated water retention and migration behaviour in Boom Clay. SFC1 level 5 report: First full Draft – status 2009

Research output: Report/bookER - External report

Institutes & Expert groups

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  • ER-248.pdf

    Final published version, 1.96 MB, PDF document

Abstract

This report presents an overview of tritiated water (HTO) transport in the Boom Clay formation (status 2009). HTO is a small, neutral and non-sorbing radioactive tracer. Therefore, HTO is ideally suited for studying the transport characteristics inherent to the clay formation itself, and serves as a reference molecule for migration parameters of a whole range of solutes. The major parameters which influence the diffusive behaviour of HTO are: 1) temperature, with higher temperatures leading to higher pore diffusion coefficients; 2) anisotropy, with the preferential orientation of clay platelets leading to different path lengthening depending on the direction of diffusion; 3) the degree of compaction, or the confinement pressure, with a higher pressure leading to a general decrease of both the pore diffusion coefficient and the diffusion accessible porosity. The pore water chemistry, including ionic strength and near-field effects, clearly has a smaller impact on the migration parameters, indicating that diffusion of HTO is predominantly subjected to physically-determined processes. This report contains Source and Expert Ranges for HTO migration parameters in Boom Clay (status 2009). The report is also available as NIROND Technical Report NIROND-TR 2009-16E.

Details

Original languageEnglish
PublisherSCK CEN - Belgian Nuclear Research Center
Number of pages61
Volume1
Edition0
Publication statusPublished - Dec 2013

Publication series

NameSCK•CEN Reports
PublisherStudiecentrum voor Kernenergie
No.ER-248

Keywords

  • Tritiated water, HTO, transport, Boom Clay

ID: 92673