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Coprecipitation Studies from Simfuel Solutions in 5 m NaClMedia

Published online by Cambridge University Press:  03 September 2012

P. Diaz-Arocas  and
J. Garcia-Serrano
P. Diaz-Arocas
Affiliation:
CIEMAT (ITN). Avda. Complutense, 22. E-28040 Madrid, Spain
J. Garcia-Serrano
Affiliation:
CIEMAT (ITN). Avda. Complutense, 22. E-28040 Madrid, Spain
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Abstract

Extensive Research is performed in many countries in order to evaluate thespent fuel behaviour under repository conditions. Several aspects as thecontrol of the oxidative spent fuel dissolution by secondary phasesformation are not yet clear.

Coprecipitation experiments from SIMFUEL solutions are performed to study ifminor elements will influence the formation of secondary phases. Therefore,coprecipitation studies from SIMFUEL solutions aims at identification ofstable phases of significant simulated fission products. These experimentsprovide upper limits for solution concentration and distribution ratios ofsimulate fission products at several pH values. SIMFUEL pellets, whichsimulate an irradiated fuel with burnup of 50 GWd/tU were provided by AECLResearch Laboratories, Canada. Experiments were carried out by addition ofan aliquot of the initial SIMFUEL solution to 5 m NaCI free of carbonatessolution. The selected pH was maintained constant during the experiments.The pH range considered was from 5.5 to 9.3. Analyses of the solutions wereperformed for uranium by Laser fluorescence and for the minor elements byICP-MS. Solid phases formed at pH 5.5 were dissolved and analysed by ICP-MS.Results of the evolution in solution vs. pH of simulated fission productsconcentrations are shown in this paper.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 465: Symposium II – Scienfific Basis for Nuclear Waste Management XX , 1996 , 543
Copyright
Copyright © Materials Research Society 1997

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References

REFERENCES

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