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Conference Article: Experimental and theoretical analysis of spent AVR fuels.
Werner, H.; Thomas, F. (Forschungszentrum Juelich GmbH (Germany, F.R.)); Woloch, F.; Reitsamer, G.; Falta, G.; Strigl, A. (Oesterreichisches Forschungszentrum Seibersdorf GmbH (Austria))Abstract
The KFA-Juelich and the OEFZ-Seibersdorf are cooperating in a programme of experimental and theoretical analysis of spent AVR-fuel elements. The detailed experimental analysis in the OEFZ started with pebbles of 17% enriched (GLE-4) and of 93% enriched (GO) fuel showing FIMA values of about 3.5, 7.5 and 10.5% respectively. The isotopic composition of coated particles from different positions within the pebbles were measured by both gamma spectrometric and mass spectroscopic methods. To gain FIMA values from both methods Cs and Nd isotopes were included. Theoretical calculations used the new HTR-2000 programme system of KFA to perform the in-core-following of the pebbles as they move through the core. The reactor model contains 25 spectral zones and 139 regions in three dimensions in the core, fit to represent the movements of the pebbles including recycling between the inner and outer core regions.
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key words: Gas Cooled Reactor, Nuclear Technology
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