Can we use tracer tests to obtain data for performance assessment of repositories for nuclear waste?
2009 (English)In: Hydrogeology Journal, ISSN 1431-2174, E-ISSN 1435-0157, Vol. 17, no 5, 1067-1080 p.Article in journal (Refereed) Published
With regard to the long-term safety of repositories for spent nuclear fuel, tracer tests have commonly been used in site characterisation (SC) for finding information that can be later used for performance assessment (PA). The question arises as to whether data obtained in tracer tests performed over a time scale of weeks or months are relevant for PA calculations. As part of a study overseen by the A"spo Task Force, the mechanisms that determine the radionuclide residence time under SC and PA conditions are addressed, given that they influence the validity of data transference from SC to PA. The results show that radionuclide transport in SC and PA, although governed by the same retardation mechanisms, are dominated by different sub-processes. In a practical sense this means that the parameter values (typically fracture apertures and "in situ" apparent retention data) determined in tracer tests, performed as a part of the SC program, should not be used directly for making PA predictions. The emphasis in SC should focus more on the determination of other parameters of relevance at PA timescales. The PA-specific flow rate, flow connectivity, and flow-wetted surface to flow ratio are given here as examples.
Place, publisher, year, edition, pages
2009. Vol. 17, no 5, 1067-1080 p.
Site characterisation, Performance assessment, Fractured rock, Aspo, Task Force, Sweden, grimsel test-site, solute transport, crystalline rocks, granitic rock, aspo, migration, network, diffusion, fracture, sweden
IdentifiersURN: urn:nbn:se:kth:diva-18529DOI: 10.1007/s10040-008-0418-7ISI: 000267104800004ScopusID: 2-s2.0-67649394367OAI: oai:DiVA.org:kth-18529DiVA: diva2:336576
QC 201005252010-08-052010-08-052011-01-13Bibliographically approved