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In the Purex process for nuclear fuel reprocessing, fine undissolved particles containing mainly platinoid elements are entrained in the process after the shearing and dissolution steps. To avoid problems during the subsequent extraction cycles, most of these insoluble dissolution fines are separated from the process stream by a clarification step, and are transferred to storage tanks pending vitrification after mixing with the fission product solution concentrates.

The objective was to investigate the effects of these fines on the French R7T7 fission product containment glass, with particular attention to the platinoid elements (ruthenium, rhodium and palladium) which are insoluble in the glass. Two glass samples were fabricated for this purpose in the Vulcain cell and submitted to a series of characterization tests: analysis of the fines suspension, chemical and radiochemical analysis of the glass, radionuclide homogeneity check and true activity measurement by gamma scanning, glass microhomogeneity check before and after heat treatment; aqueous corrosion resistance in static mode at 90 C and in Soxhlet mode at 100 C.

This report summarizes the results of all the analyses and characterization tests conducted on the glass specimens. ns.

Additional information

Authors: DUSSOSSOY J L, CEA Valrhô, Bagnols-sur-Cèze (FR);CHARBONNEL J G, CEA Valrhô, Bagnols-sur-Cèze (FR);FILLET C, CEA Valrhô, Bagnols-sur-Cèze (FR)
Bibliographic Reference: EUR 17112 EN (1997) 35pp., FS, ECU 8.50
Availability: Available from the (2)
ISBN: ISBN 92-827-9277-3
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