Title: Instant release of fission products in leaching experiments with high burn-up nuclear fuels in the framework of the Euratom project FIRST- Nuclides
Authors: LEMMENS KARELGONZÁLEZ ROBLES ERNESTOKIENZLER B.CURTI ENZOSERRANO PURROY DANIELSUREDA R.MARTINEZ TORRENTS ALBERTROTH OLIVIASLONSZKI E.MENNECART THIERRYGÜNTHER-LEOPOLD INESHOZER ZOLTAN
Citation: JOURNAL OF NUCLEAR MATERIALS vol. 484 p. 307-323
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2017
JRC N°: JRC104215
ISSN: 0022-3115
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC104215
DOI: 10.1016/j.jnucmat.2016.10.048
Type: Articles in periodicals and books
Abstract: The instant release of fission products from high burn-up UO2 fuels and one MOX fuel was investigated by means of leach tests. The samples covered PWR and BWR fuels at average rod burn-up in the range of 45–63 GWd/tHM and included clad fuel segments, fuel segments with opened cladding, fuel fragments and fuel powder. The tests were performed with sodium chloride – bicarbonate solutions under oxidizing conditions and, for one test, in reducing Ar/H2 atmosphere. The iodine and cesium release could be partially explained by the differences in sample preparation, leading to different sizes and properties of the exposed surface areas. Iodine and cesium releases tend to correlate with FGR and linear power rating, but the scatter of the data is significant. Although the gap between the fuel and the cladding was closed in some high burn-up samples, fissures still provide possible preferential transport pathways.
JRC Directorate:Nuclear Safety and Security

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