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Tesi etd-11102011-104229


Thesis type
Tesi di laurea specialistica
Author
PASQUINI, MARIA ELENA
URN
etd-11102011-104229
Title
Development of physical models for the analysis of vapor explosion in superheated sodium
Struttura
INGEGNERIA
Corso di studi
INGEGNERIA ENERGETICA
Supervisors
relatore Prof. Ambrosini, Walter
relatore Dott. Forgione, Nicola
relatore Dott. Bucci, Matteo
relatore Prof. Oriolo, Francesco
Parole chiave
  • vapor explosion
  • sodium cooled reactor
Data inizio appello
02/12/2011;
Consultabilità
Parziale
Data di rilascio
02/12/2051
Riassunto analitico
The explosion of superheated sodium is a phenomenon of interest in the analysis of automatic shutdown for negative reactivity occurred in the Phénix reactor.
This work aims at improving the understanding of vapor explosion initiated by the presence of a certain quantity of metastable superheated sodium. A particular configuration has been addressed, representative of the Phénix core and aiming at estimating the pressure loads on the fuel assemblies, occurring during an hypothetical event of a vapor explosion.
The case of vapor explosion initiated within the DAC assembly is addressed, since it is suspected to be at the origin of the Phénix AURNs. An analytical model is proposed, since no models are available for this particular phenomenon, basing on theoretic knowledge in physics and fluid-dynamics subjects. The system of equations proposed is then implemented in cast3m code making use of numerical schemes and computational methods.
The results of this analysis will be used as source terms for IFS investigation (fluid-structure interaction).
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