Grimsel test site phase VI, LTD WP 1; Predictive modelling for LTD monopole experiment

Mri, A.*; Soler, P.*; Ota, Kunio ; Havlov, V.*

The Long-Term Diffusion (LTD) project, an integral part of Phase IV at the Grimsel Test Site, Switzerland, is an international cooperative project (HYRL, Finland; JAEA and AIST, Japan; NRI/RAWRA, Czech Republic; Nagra, Switzerland) and consists of a series of experiments which aims to obtain quantitative information on matrix diffusion under in situ conditions. The LTD is divided into four work packages, WP1-4. The in situ monopole diffusion experiment (WP1) is preceded by predictive modelling exercise to support the design of the in situ experiment and to increase confidence in the modelling of long-term and large-scale diffusion process by comparing the predictions with the experimental results. This report presents a short overview of the conceptual models and codes applied and the predicted tracer profiles in the rock matrix as well as the expected tracer concentration in the injection solution.