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AbstractAbstract
[en] The observation of micrographic documents from fuel after a CABRI test leads to postulate a specific mode of transient fuel melting during a rapid nuclear power excursion. When reaching the melt threshold, the bands which are characteristic for the solid state are broken statistically over a macroscopic region. The time of maintaining the fuel at the critical enthalpy level between solid and liquid is too short to lead to a phase separation. A significant life-time (approximately 1 second) of this intermediate ''unsolide'' state would have consequences on the variation of physical properties linked to the phase transition solid/liquid: viscosity, specific volume and (for the irradiated fuel) fission gas release
[fr]
L'observation de micrographies du combustible apres essai CABRI nous conduit a postuler un mode de fusion specifique pour l'echauffement rapide par chauffage nucleaire. A l'atteinte du seuil de la fusion les liaisons caracteristiques de l'etat solide sont rompues statistiquement dans un domaine macroscopique et le temps de maintien au niveau critique d'enthalpie entre solide et liquide est trop court pour conduire a une separation des phases. Une duree de vie significative (approximativement = 1 seconde) de cet etat intermediaire aurait des consequences sur la variation des proprietes physiques liee au changement d'etat: viscosite, volume specifique, relachement des gaz de fission du combustible irradieOriginal Title
Le comportement a la fusion en regime transitoire de combustibles nucleaires
Primary Subject
Source
Oct 1982; 17 p; 8. European conference on thermophysical properties; Baden-Baden (Germany, F.R.); 27 Sep - 1 Oct 1982; DSN--578
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Report
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Conference
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