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Radionuclides Release From the Spent Fuel Under Disposal Conditions: Re-evaluation of the Instant Release Fraction

Published online by Cambridge University Press:  01 February 2011

Cécile Ferry ,
Jean-Paul Piron ,
Arnaud Poulesquen  and
Christophe Poinssot
Cécile Ferry
Affiliation:
Department of Physico-chemistry, Commissariat à l'Energie Atomique, CEA-Saclay, Gif-sur-Yvette, 91191, France
Jean-Paul Piron
Affiliation:
Department of Fuel Studies, Commissariat à l'Energie Atomique, CEA-Cadarache, Saint-Paul Lez Durance, 13108, France
Arnaud Poulesquen
Affiliation:
Department of Physico-chemistry, Commissariat à l'Energie Atomique, CEA-Saclay, Gif-sur-Yvette, 91191, France
Christophe Poinssot
Affiliation:
Department of Physico-chemistry, Commissariat à l'Energie Atomique, CEA-Saclay, Gif-sur-Yvette, 91191, France
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Abstract

The so-called Instantaneous Release Fraction (or IRF) corresponds to the rapid release of radioactivity by the spent fuel rod at the canister breaching time in repository and depends on the spent fuel evolution in a closed system. The effect of He accumulation on the spent fuel pellet microstructure and diffusion processes are here re-assessed in the light of the recent results issued from the projects Near-Field PROcesses and PRECCI. It allows diminishing the conservatism of the former IRF values of key safety relevant radionuclides for PWR UO2 fuels.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1107: Scientific Basis for Nuclear Waste Management XXXI , 2008 , 447
Copyright
Copyright © Materials Research Society 2008

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