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Enhancing Nuclear Safety


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Publications

Analysis of the Thermal Fragmentation as a Mechanism for the Initiation of Steam Explosion


Congress title :ICAPP seventh International Conference on Advances in Nuclear Power Plants
Congress location :Nice
Congress date :13/05/2007

Document type > *Congrès/colloque

Keywords > explosivity, steam explosion, thermal fragmentation

Research Unit > IRSN/DSR/SAGR/BPhAG

Authors > LAMOME Julien, MEIGNEN Renaud

Publication Date > 18/05/2007

Summary

We propose a theoretical study of the film behaviour and its stability during the phenomenon of drop thermal fragmentation. We discuss the role of the various possible influences on the film collapse and instability processes. We firstly discuss the possibility of simple fuel/coolant contacts as a mechanism for the drop instability. Under this assumption, we then describe and test our model on Nelson & Duda explosivity maps, with a particular emphasis on the description of the film evolution. The reasonable agreement obtained allows us to analyse the effect of various parameters as the ambient pressure, subcooling and trigger pulse shape on the film behaviour in Nelson & Duda experiments. The perspectives of this work are then shortly discussed including extrapolation to more prototypic situations and the role of thermal fragmentation itself.

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