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Experimental Results on Pouring and Underwater Liquid Melt Spreading and Energetic Melt-coolant Interaction
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.ORCID iD: 0000-0002-2725-0558
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.ORCID iD: 0000-0002-0683-9136
2012 (English)In: Proceedings of The 9th International Topical Meeting on Nuclear Thermal-Hydraulics, Operation and Safety (NUTHOS-9), Kaohsiung, Taiwan, September 9-13, American Nuclear Society, 2012Conference paper, Published paper (Refereed)
Abstract [en]

In a hypothetical light water reactor (LWR) core-melt accident with corium release from the reactor  vessel,  the  ultimate  containment  integrity  is  contingent  on  coolability  of  the decay-heated core debris. Pouring of melt into a pool of water located in the reactor cavity is considered in several designs of existing and new LWRs  as a part of severe accident (SA) management strategies. At certain conditions of melt release into the pool (e.g. large ratio of the  vessel  breach  size  to  the  pool  depth),  liquid  melt  can  spread  under  water  and  reach  a coolable configuration. Coolability of the melt depends on decay heat generated per unit area of the spread melt which is directly proportional to the terminal spread thickness of the melt layer. Thus a success of the debris bed coolability depends on the efficacy of the molten core materials spreading which is limited by rapid solidification  of the melt due to melt-coolant heat transfer. Among the factors which can reduce spreading effectiveness are heat and mass losses of the liquid melt due to fragmentation, cooling and solidification in the process of melt jet pouring into the pool. Previous extensive experimental and analytical works on liquid melt spreading and solidification were focused mostly on analysis of melt spreading in case of melt release through an inclined channel. Melt spreading under water as a result of a jet pouring into a pool, has not been addressed systematically. This paper summarizes first experimental results obtained in the frame of Pouring and Underwater Liquid Melt Spreading (PULiMS) research program. The work is an extension of previously reported by Kudinov et al. [1-4] studies  on debris  bed formation and  agglomeration (DEFOR-A)  phenomena.  In contrast  to DEFOR-A experiments, PULiMS exploratory tests (PULiMS-E) discussed in this work have been performed with a shallow (20 cm) water pool. Up to 78 kg of high melting temperature core melt simulant materials (eutectic mixtures of the binary oxides such as Bi 2 O 3 -WO 3  and ZrO 2 -WO 3 )  is  used  in  each  test.  Initial  melt  superheat  varied  from  70  up  to  300ºC.  In  the paper we discuss: (i) experimental observations  of the  jet  pouring into  a  shallow pool  and underwater  liquid  melt  spreading  on  a  flat  surface;  (ii)  characterization  of  solidified  melt debris;  (iii)  key  physical  processes  as  well  as  melt  material  properties  and  experimental conditions  most  influencing  the  melt  spreading  and  solidification  phenomena.  Produced experimental data can be used for validation of the models for prediction of the underwater liquid melt spreading in case of melt jet pouring in a shallow water pool.

Place, publisher, year, edition, pages
American Nuclear Society, 2012.
Keyword [en]
PULiMS, underwater melt spreading, melt, spreading, steam explosion
National Category
Other Engineering and Technologies not elsewhere specified Other Physics Topics
Identifiers
URN: urn:nbn:se:kth:diva-137209OAI: oai:DiVA.org:kth-137209DiVA: diva2:678317
Conference
The 9th International Topical Meeting on Nuclear Thermal-Hydraulics, Operation and Safety (NUTHOS-9), Kaohsiung, Taiwan, September 9-13
Note

QC 20131212

Available from: 2013-12-11 Created: 2013-12-11 Last updated: 2013-12-16Bibliographically approved

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NUTHOS9-N9P0303(1017 kB)313 downloads
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Konovalenko, AlexanderKudinov, Pavel

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