This report presents the interpretation of two high temperature VERCORS tests using two release codes, the semi-empirical module ELSA and the mechanistic module MFPR. The release of volatile fission products is predicted satisfactorily in both quantity and, to a lesser extent, rate. Several possibilities for improvements have been proposed for both approaches. Other FPs show mixed agreement: for MFPR, the release of some, such as Mo and Sb is predicted quite well whereas for all the others, reproduction of the experimental results is poor. Release of less volatile fission products was, in general, underestimated. These results imply that an improvement of the thermochemical model is probably needed. ELSA shows good agreement for La, Ce and Ba, and poor agreement for Ru and Mo (new vapour pressure calculations are needed).This work was presented at the Winter Meeting of the American Nuclear Society, in Washington, on 17 November 1998.

Interpretation of the VERCORS 4 and 5 Experiments Using the ELSA and MPFR Release Codes

Davidovich, N.
1998-11-01

Abstract

This report presents the interpretation of two high temperature VERCORS tests using two release codes, the semi-empirical module ELSA and the mechanistic module MFPR. The release of volatile fission products is predicted satisfactorily in both quantity and, to a lesser extent, rate. Several possibilities for improvements have been proposed for both approaches. Other FPs show mixed agreement: for MFPR, the release of some, such as Mo and Sb is predicted quite well whereas for all the others, reproduction of the experimental results is poor. Release of less volatile fission products was, in general, underestimated. These results imply that an improvement of the thermochemical model is probably needed. ELSA shows good agreement for La, Ce and Ba, and poor agreement for Ru and Mo (new vapour pressure calculations are needed).This work was presented at the Winter Meeting of the American Nuclear Society, in Washington, on 17 November 1998.
Analisi sistemi e di sicurezza
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12079/4316
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