Objective
The project sets out to evaluate, by carrying out leaching tests in various conditions (demineralized water, Evian water, water with complexing agents) the confining capabilities of three types of coating matrices (bitumen, cement, thermo-setting resin) with regard to wastes such as "STE 3 LH" sludges, sodium borate evaporator concentrates or ion-exchange resins, containing U, Tu, Tc, 90Sr, 63Ni, a and beta long-lived emitters.
The technical solution under study is the storage of long-lived radioactive wastes and consists of embedding them in suitable confining matrics (glass, cement, bitumen) and burying the coats in stable geological sites where the radioactivity will decrease naturally. The valuation of the confining capability of the matrices used, determined by implementing leaching tests, enables us to assess the reliability of the process. Safety studies indicate that the long term risk mainly stems from long-lived radionuclides. In this context, the research contract is related to a basic leaching study of pure beta and alpha long-lived emitters in real or simulated wastes, in order to collect basic results about those radionuclides which are critical for the safety analysis of disposal storage and for which no reliable data is available at the moment. To date, the project has succeeded in establishing a common working frame, agreeing on the leaching methodologies, updating the initial propositions, manufacturing the samples and performing some preliminary tests. The samples are made of ion exchange resins (REI), evaporator sodium borate-concentrates or chemical STE3 La Hague sludge, containing caesium, technetuim, thallium, uranium, iodine, strontuim-90 or nickel-63 and, embedded in cement, bitumen or thermosetting resins. The leachant is either demineralized water or natural water. The initial composition of the samples has been calculated in considering the formula of the sequential leaching velocity of an element, the detection limit of the analytical techniques used and estimations of the leaching velocities of the elements taken into account.
Work programme:
Working organisation and setting-up of a working programme
Harmonization and implementation of the leaching procedures
Definition and manufacturing of the samples
Selection of the types of wastes, the cement formulae and of the elements to be taken into account
Implementation of the leaching experiments with simulated wastes and with actual resins
Optimisation of the analytical procedures
Data interpretation
Comparative study of the various experiments
Final evaluation
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- engineering and technology other engineering and technologies nuclear engineering nuclear waste management
- natural sciences chemical sciences inorganic chemistry alkali metals
- engineering and technology materials engineering coating and films
- engineering and technology materials engineering amorphous solids
- natural sciences chemical sciences nuclear chemistry radiation chemistry
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
13108 Saint-Paul-lez-Durance
France
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