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A1: Transport mechanisms
Diffusivity
Connected matrix porosity
Ion exclusion
Surface diffusion
SA Parameter
Kd
Csol De A3.2/C1.1.2: Evolution of pore-fluid (water and gas) chemistry and
mineralogy in the host rock formation and in embedding units
Sorption coefficient
Maximum solubility
Effective diffusion coefficient
Accessible porosity
B1.2.2: Organics from waste and their effect on transport
properties of the host rock
A2: Retardation
Sorption (broad definition)
Figure 2: FEP groups and single FEPs (taken from FEPCAT) to which the FUNMIG tasks from
RTDC 1, 2 and 3 were mapped, and affected safety assessment parameters for the clay-rich host
rock case.
A very valuable result of this co-work is the comprehensive catalogue of the tasks performed within
FUNMIG providing concise information on aim, type of work, involved research groups, results
(abstracts) and bibliography for each task. It will be attached to the final RTDC 6 report on “FUN-
MIG topics and processes and their treatment in the safety case” [6] and will facilitate the retrieval
of information acquired within FUNMIG and relevant for future safety cases.
In developing the Task Evaluation Tables (TETs) a tool was made available for the information exchange
between the performance assessors and the scientists on the level of the single tasks. The
TETs allowed the performance assessors to address their feedback directly to the scientists concerned
(WMO’s view) and the scientists to appraise their work with respect to achievements for
future safety cases (researcher’s view). The results of the task evaluation by the performance assessors
(WMOs) indicate that the scope of investigated processes in FUNMIG was quite well set and
that substantial progress was made in research fields important for the development of future safety
cases for the different radioactive waste disposal programmes.
To optimize the research programme it would have been desirable to have the relevance of the chosen
research topics for future safety cases available at the beginning of the project. In this respect a
TET can be a helpful tool for planning future Integrated Projects.
The synthesis by collecting the FEPs in Super-FEPs did not reveal ground-breaking findings; it
rather confirmed the WMO’s experience with FEPs related to the barrier function of the host rock
for the radionuclides.
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B7: Microbiological perturbations
Dissolution / precipitation of solid phases
Solid solutions / co-precipitation
Ion exchange
Surface complexation