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Progress in modelling fission-product release: an update with respect to IRSN’s release codes

9th International Conference on CANDU Fuel, Belleville, Ontario, Canada, 17-21 september 2005

R. Dubourg, M.P. Kissane , P. Taylor, W. Plumecocq.

Document type > *Congrès/colloque

Keywords > safety, fission product release, MFPR code, severe accident

Research Unit > IRSN/DPAM/SEMIC/LEPF

Authors > DUBOURG Roland, KISSANE Martin, PLUMECOCQ William

Publication Date > 17/09/2005

Summary

IRSN presented in detail at this conference in 2003 the modelling of its release codes, ASTEC/ELSA and MFPR. Progress relating to key objectives is described here. ELSA aims to calculate reliably and rapidly release of fission products (FPs) and structural materials from a degrading core for all in-vessel configurations. Two areas were targeted for improvement: release of so-called semi-volatile FPs and release of structural materials. For the mechanistic code MFPR developed by IBRAE (Russian Academy of Sciences) and IRSN, with the new objective of analysis of design-basis loss-of-coolant accidents, modelling of fission-gas release has been improved mainly addressing processes occurring during normal operation. Further improvement depends in part on results of experiments and analyses that IRSN has launched with partners.

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