Abstract
The TRUE Block Scale project was carried out during 1996–2002. This project focused on site characterisation and building of hydrostructural and microstructural models, sorbing tracer experiments in single structures and networks of structures over distances ranging between 15 and 100 m and also
involved a unified application of various model approaches for modelling the in situ experiments. In 2002, ANDRA, Posiva, JNC and SKB decided to pursue some remaining issues in the so-called TRUE Block Scale Continuation project (TRUE BS2). The specific objectives of BS2 can be summarised as: "Improve understanding of transport pathways at the block scale, including assessment of effects of geology and geometry, macrostructure and microstructure". In order to cater to addressing the stated objective a series of hypotheses were formulated which explored the importance of geological information for predicting transport and retention and the possible differences between transport and retention between transport paths dominated by faults and those dominated by non-fault fractures (background fractures). In the process,
prospects for carrying out experiments in fracture networks over longer distances (c 20–100 m) were explored. It was identified that experiments with sorbing tracers over these distances were prohibitive because of the time frames involved and the projected low mass recoveries. Instead the experimental locus was shifted to a geological structure previously not investigated by tracer
tests in the TRUE Block Scale experiments.
involved a unified application of various model approaches for modelling the in situ experiments. In 2002, ANDRA, Posiva, JNC and SKB decided to pursue some remaining issues in the so-called TRUE Block Scale Continuation project (TRUE BS2). The specific objectives of BS2 can be summarised as: "Improve understanding of transport pathways at the block scale, including assessment of effects of geology and geometry, macrostructure and microstructure". In order to cater to addressing the stated objective a series of hypotheses were formulated which explored the importance of geological information for predicting transport and retention and the possible differences between transport and retention between transport paths dominated by faults and those dominated by non-fault fractures (background fractures). In the process,
prospects for carrying out experiments in fracture networks over longer distances (c 20–100 m) were explored. It was identified that experiments with sorbing tracers over these distances were prohibitive because of the time frames involved and the projected low mass recoveries. Instead the experimental locus was shifted to a geological structure previously not investigated by tracer
tests in the TRUE Block Scale experiments.
| Original language | English |
|---|---|
| Place of Publication | Stockholm |
| Publisher | Svensk Kärnbränslehantering AB (SKB) |
| Number of pages | 167 |
| Publication status | Published - 2007 |
| MoE publication type | D4 Published development or research report or study |
Publication series
| Series | Svensk kärnbränslehantering AB. Technical Report |
|---|---|
| Number | TR-06-42 |
| ISSN | 1404-0344 |