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KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.
2009 (English)In: NUCLEAR ENGINEERING AND TECHNOLOGY, ISSN 1738-5733, Vol. 41, no 9, 1215-1222 p.Article in journal (Refereed) Published
Abstract [en]

The present work pertains to a research program to study Molten Fuel-Coolant Interactions (MFCI), which may occur in anuclear power plant during a hypothetical severe accident. Dynamics of the hot liquid (melt) droplet and the volatile liquid (coolant)were investigated in the MISTEE (Micro-Interactions in Steam Explosion Experiments) facility by performing well-controlled,externally triggered, single-droplet experiments, using a high-speed visualization system with synchronized digital cinematographyand continuous X-ray radiography.The current study is concerned with the MISTEE-NCG test campaign, in which a considerable amount of non-condensablegases (NCG) are present in the film that enfolds the molten droplet. The SHARP images for the MISTEE-NCG tests were analyzedand special attention was given to the morphology (aspect ratio) and dynamics of the air/ vapor bubble, as well as the melt droppreconditioning. Energetics of the vapor explosion (conversion ratio) were also evaluated.The MISTEE–NCG tests showed two main aspects when compared to the MISTEE test series (without entrapped air). First,analysis showed that the melt preconditioning still strongly depends on the coolant subcooling. Second, in respect to the energetics,the tests consistently showed a reduced conversion ratio compared to that of the MISTEE test series.

Place, publisher, year, edition, pages
2009. Vol. 41, no 9, 1215-1222 p.
Keyword [en]
Fuel-Coolant Interactions, Non-Condensable Gases, Preconditioning, X-ray Radiography
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-75462OAI: diva2:490506
QC 20120209Available from: 2012-02-05 Created: 2012-02-05 Last updated: 2012-02-09Bibliographically approved

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Hansson Concilio, Roberta
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