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The purpose of this work is to understand the effect produced by radiolysis alpha and the fuel's specific surface in the mould thinning, under rest conditions by means of evaluating the concentration of uranium released in solution. To perform these experiments we used UO(2) tabletting moulds loaded with a content of approximately 10 and approximately 0,1 per cent in weight of (238)Pu.

The main findings are: in an initially anoxic atmosphere (nitrogen atmosphere) the quantity of Uranium in solution increases on the moulds doped with alpha emitters assuming the oxidant effect that "radiolysis" produces over the test mould surfaces.

In non-doped moulds, the Uranium dissolution on the specific surface of the moulds is of two orders of magnitude superior than in the doped moulds. This effect of the size of the doping particle (d inferior than 63 micrometers) has not been observed in the doped moulds, implying that probably in a nitrogen atmosphere, the water radiolysis is able to minimise the surface effects.

Additional information

Authors: COBOS ET AL, ITU, Karlsruhe (DE);DIAZ AROCAZ P, CIEMAT, Madrid (PT)
Bibliographic Reference: Oral Report: SNE 2000, Reunion Annual de la SNE, Leon (ES), 4-6 October, 2000
Availability: 1 as paper ES 61373 ORA
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