Initial studies on determination of key master variables and radionuclide behavior in the SFR environment
Tutor / director / evaluatorBruno Salgot, Jorge; Duro Pérez, Lara; Malmström, Maria; Pablo Ribas, Joan de
Document typeMaster thesis
Rights accessRestricted access - confidentiality agreement
The SFR repository is intended for the final disposal of low and intermediate level radioactive waste in Sweden. This repository contains a significant amount of metals (i.e. iron) and organic materials such as bitumen. A key component in the repository is cement, which is mainly used for galleries and vaults construction although it could also be a waste component (cement used to be used as a waste stabilizer). The intrusion of groundwater within the SFR repository produces highly alkaline and reducing conditions. Among others, two important consequences of these processes are the alteration of cement and the aerobic corrosion of iron. As a result, speciation of the redox sensitive radionuclides (i.e. Ni,Eu,Np,Pu,Tc and Se) could be modified. The main objective of this report is to establish the methodological and scientific principles necessary for the completion of the PhD thesis: “Determination of key master variables and radionuclide behavior in the SFR environment”. For this purpose, the methodology that has been followed consists of: a) a literature review, focused on studies related to the Fe2+/Fe0 redox potential determination and studies related to Ni(OH)2(s) solubility; b) modeling and interpretation of the data reported in the literature; c) design of the experimental work based on the previous literature review; d) preliminary tests concerning the experimental part and discussion of results. The critical literature review performed has allowed the identification of, not only the main gaps, but also the key parameters to take into account in future experimental studies. Moreover, preliminary experimental results confirmed the feasibility of the experimental approach to be followed, although to improve the results the system has to be further developed and adapted. In conclusion, this report is the cornerstone of the PhD thesis that is being done and contextualizes the future studies of this PhD thesis.
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