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This paper presents details of experiments on the leaching of UO(2) and SIMFUEL (simulated burnup UO(2)). The experimental techniques to determine nondestructively the thickness and composition of layers formed on leached UO(2) were extended by developing methods to measure selectively oxygen atoms and defects in the oxygen sublattice near surfaces. Examples of nondestructive measurements of oxygen gradients on UO(2) leached in H(2)O between 130 and 200 C, with pH as parameter, are shown. Extended leach tests were also performed with SIMFUEL. Leaching was done in autoclaves in H(2)O between 130 and 200 C. Rutherford backscattering (RBS), elastic recoil detection analysis (ERDA) and SEM/EDAX were used to analyse surface changes and to relate them to measured weight changes. As with UO(2), surface oxidation of SIMFUEL leads to the formation of layers of composition near U(3)O(7) for short leaching periods. The conclusion from this study is that fission products dissolved in UO(2) reduce aqueous corrosion.

Additional information

Authors: MATZKE H, JRC Karlsruhe (DE)
Bibliographic Reference: Paper presented: Spent Fuel Workshop, Santa Fe (US), September 26-29, 1993
Availability: Text not available
Record Number: 199410065 / Last updated on: 1994-11-28
Original language: en
Available languages: en