Community Research and Development Information Service - CORDIS

Abstract

Static leaching of SIMFUEL in granitic water at 200 C for 1, 10, 100, and 1000 hours under argon atmosphere and in presence of granite monoliths was studied at 3 simulated burnup compositions. The results did not indicate any clear burnup effect. The analysis of the leachant solutions showed that the amounts of dissolved fission products and uranium were low under these experimental conditions. With the exception of U and Mo, measurable concentrations of some of the fission products were found only in the container and in the granite rinse solutions. Surface etching occurred after the shortest leaching time and did not appear to increase with time. Small deposits on the surface were visible only after the longest leaching times. Electron microprobe analysis showed that small, needle-shaped silico-aluminates were present on the leached surfaces. These results were compared to results obtained from leaching tests on SIMFUEL and UO(2) in demineralized water in air. Under these latter conditions, leach rates were significantly higher. With increasing leaching time, the surfaces became increasingly covered by crystals of redeposited uranium in an higher oxide form (eg schoepite).

Additional information

Authors: RONDINELLA V V, JRC Karlsruhe (DE);MATZKE H J, JRC Karlsruhe (DE)
Bibliographic Reference: Article: Journal of Nuclear Materials (1996)
Record Number: 199610485 / Last updated on: 1996-05-20
Category: PUBLICATION
Original language: en
Available languages: en
Follow us on: RSS Facebook Twitter YouTube Managed by the EU Publications Office Top