Quench Front Progression in a Superheated Porous Medium: Experimental Analysis and Model Development
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
C6-1 Debris Bed Cooling

Andrea Bachrata (IRSN)
Florian Fichot (IRSN)
Georges Repetto (IRSN)
Michel Quintard (IMFT)
Joelle Fleurot (IRSN)


In case of severe accident in a nuclear reactor, the fuel rods may be highly damaged and oxidized

and finally collapse to form a debris bed. Removal of decay heat from a debris bed is a

challenging issue because of the difficulty for water to flow inside. Currently, IRSN has started

experimental program PEARL with two experimental facilities PRELUDE and PEARL, to

investigate the reflood process at high temperature, for various particle sizes. On the basis of

PRELUDE experimental results, the thermal hydraulic features of the quench front have been

analysed and the intensity of heat transfers was estimated. From a selection of experimental

results, a reflooding model was improved and validated. The model is implemented in the code

ICARE-CATHARE developed by IRSN which is used for severe accident reactor analysis.

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