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Experiments on in-vessel melt coolability in the EC-FOREVER program
KTH, Superseded Departments, Energy Technology. (Kärnkraftsäkerhet)
KTH, Superseded Departments, Energy Technology. (Kärnkraftsäkerhet)
KTH, Superseded Departments, Energy Technology. (Kärnkraftsäkerhet)
2004 (English)In: Proceeding of the 2004 international congress on advances in nuclear power plants (ICAPP'04), 2004, 917-927 p.Conference paper (Refereed)
Abstract [en]

This paper reports the results from the experiments conducted on the coolability of corium melt during a severe accident scenario when the bottom head is full of the core melt, undergoing natural circulation. These experiments are part of the EC-FOREVER Program in which vessel failure experiments have also been performed. The experiments are performed in a 1/10. scale vessel ({approx_equal} 400 mm dia. and 15 mm wall thickness) and the oxidic melt employed is the mixture CaO + B{sub 2}O{sub 3} at {approx_equal} 1400 K, representing the corium melt mixture of UO{sub 2} + ZrO{sub 2}. The experiments employed an initial phase, during which uniform volumetric heating of the melt was provided and the vessel was pressurized to {approx_equal} 25 bar, for several hours, to generate maximum creep deformation of {approx_equal} 5%; in order to provide the conditions for the formation of a gap between the melt-pool crust and the bottom head wall. After this phase, the vessel was flooded with water. Data was obtained on the vessel and the melt pool temperatures in one of the EC-FOREVER experiments reported here. In the second experiment, additional data was obtained on the steam flow rate and the heat transfer to the water, at the upper face of the melt pool, as a function of time. It was found that the gap cooling mechanism was not effective in reducing the vessel wall temperatures after water flooding. Post test examinations revealed that the water ingression extended to the depth of only {approx_equal} 60 mm in the melt pool.

Place, publisher, year, edition, pages
2004. 917-927 p.
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-53581ScopusID: 2-s2.0-14844332772ISBN: 0-89448-680-2OAI: diva2:470380
the 2004 International Congress on Advances in Nuclear Power Plants, ICAPP'04. Pittsburgh, PA. 13 June 2004 - 17 June 2004
QC 20120103Available from: 2011-12-28 Created: 2011-12-28 Last updated: 2012-01-03Bibliographically approved

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