Agglomeration and size distribution of debris in DEFOR-A experiments with Bi2O3–WO3 corium simulant melt

Kudinov, Pavel; Karbojian, Aram; Tran, Chi Thanh; Villanueva, Walter

doi:10.1016/j.nucengdes.2013.06.011

Cited by 63 publications

(11 citation statements)

References 5 publications

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“…Instead, a scoping study of the fundamental process is an effective approach to understanding the actual situation. To date, there have been many experimental efforts under various conditions that have been aimed at clarifying the melt-coolant interaction, including UO2 into sodium (Magallon et al, 1992;Schins and Gunnerson, 1986), molten oxide into sodium (Kaiser et al, 1998;Matsuba et al, 2015;Schins and Gunnerson, 1986), molten metal into sodium (Kaiser et al, 1998;Matsuba et al, 2016a;Nishimura et al, 2010;Schins and Gunnerson, 1986), corium into water (Huhtiniemi and Magallon, 2001;Magallon, 2006;Magallon and Huhtiniemi, 2001;Spencer et al, 1994), molten oxide into water (Kaiser et al, 2001;Karbojian et al, 2009;Kudinov et al, 2013;Manickam et al, 2014Manickam et al, , 2016Moriyama et al, 2005) and molten metal into water (Abe et al, 2006;Bang et al, 2003;Bang and Kim, 2014;Bürger et al, 1995;Cho et al, 1991;Dinh et al, 1999;Iwasawa et al, 2015bIwasawa et al, , 2015cKondo et al, 1995;Mathai et al, 2015;Matsuo et al, 2008;Pillai et al, 2016;Spencer et al, 1986;Wei et al, 2016). The aim of all these experiments and tests was not limited to understanding a CDA in an SFR; a severe accident in a light-water reactor was also included as a possible scenario.…”

Section: Introductionmentioning

confidence: 99%

Flow transition criteria of a liquid jet into a liquid pool

Saito

Abe

Koyama

2017

Nuclear Engineering and Design

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To better understand the fundamental interactions between melt jet and coolant during a coredisruptive accident at a sodium-cooled fast reactor, the jet breakup and droplet formation in immiscible liquid-liquid systems were studied experimentally. Experiments using two different pairs of test fluids were carried out at isothermal conditions. The observed jet breakup behavior was classified into characteristic regimes based on the classical Ohnesorge classification in liquid-gas systems. The variation in breakup length obtained in the present liquid-liquid system was similar to that in a liquidgas system. The droplet size distribution in each breakup regime was analyzed using image processing and droplet formation via pinch-off, satellite formation, and entrainment was observed. The measured droplet size was compared with those available from melt jet experiments. Based on the observation and analysis results, the breakup regimes were organized on a dimensionless operating diagram, with the derived correlations representing the criteria for regime boundaries of a liquid-liquid system. Finally, the experimental data were extrapolated to the expected conditions of a sodium-cooled fast reactor. From this, it was implied that most of the hydrodynamic conditions during an accident would be close to the atomization regime, in which entrainment is the dominant process for droplet formation. Nomenclature d droplet diameter Dj0 nozzle diameter

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Section: Introductionmentioning

confidence: 99%

Flow transition criteria of a liquid jet into a liquid pool

Saito

Abe

Koyama

2017

Nuclear Engineering and Design

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“…Also, the effect of coolant temperature was highlighted. The recent study by [17] [18] [19] [20] provided additional information. They performed a series of experiments with a focus on the fractions of particulate debris and the agglomerate on the pool bottom as well as the debris size distribution during FCI.…”

Section: ) Expansion Phasementioning

confidence: 99%

Experimental Investigation on Fuel Coolant Interaction Using Simulant Ceramic Melts in Water: Insights and Conclusions

Singh¹,

Nayak²,

Kulkarni³

2020

WJNST

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Steam explosion is one of the crucial and poorly understood phenomena which may occur during severe accident scenario and may lead to containment failure. In spite of several experimental and analytical studies, the root cause of steam explosion has not been understood. Recent claims in the literature suggest that the presence of fine fragmentation during steam explosion causes its occurrence. In order to investigate this and understand the root cause of steam explosion, series of experiments were performed with 50 g to 2500 g of CaO-B 2 O 3 , a corium simulant in 4.5 litre of water. It was observed that steam explosion may occur even in the absence of fine fragments, which is contrary to the claims in the literature. To investigate further, conversion efficiency analysis was performed. This suggested that the amount of thermal energy converted to mechanical energy is more important deciding factor in explaining the occurrence of steam explosion. The present study discusses the importance of conversion efficiency in deciding steam explosion and also gives a new perspective to look at steam explosion phenomenology.

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“…local mixtures with irregularly shaped particles of different sizes (representative of those obtained after corium-water interaction outside of the vessel). Such analyses primarily aimed at consolidating the debris properties results gained from the earlier DEFOR or similar experiments (Kudinov, 2013). Both top and bottom flooding were investigated in POMECO and DEBRIS with volumetric induction heating, which required a number of technical innovations to ensure a near-to-uniform temperature profile across the debris bed diameter.…”

Section: Formation and Cooling Of Debris Bedsmentioning

confidence: 99%

Recent severe accident research synthesis of the major outcomes from the SARNET network

Dorsselaere

Auvinen

Beraha

et al. 2015

Nuclear Engineering and Design

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The SARNET network (Severe Accident Research NETwork of excellence), co-funded by the European Commission from 2004 to 2013, has allowed to significantly improve the knowledge on severe accidents and to disseminate it through courses and ERMSAR conferences. The major investigated topics, involving more than 250 researchers from 22 countries, were in- and ex-vessel corium/debris coolability, molten-core–concrete-interaction, steam explosion, hydrogen combustion and mitigation in containment, impact of oxidising conditions on source term, and iodine chemistry. The ranking of the high priority issues was updated to account for the results of recent international research and for the impact of Fukushima nuclear accidents in Japan. In addition, the ASTEC integral code was further developed to capitalize the new knowledge. The network has reached self-sustainability by integration in mid-2013 into the NUGENIA Association. The main activities and outcomes of the network are presented

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Agglomeration and size distribution of debris in DEFOR-A experiments with Bi2O3–WO3 corium simulant melt

Cited by 63 publications

References 5 publications

Flow transition criteria of a liquid jet into a liquid pool

Flow transition criteria of a liquid jet into a liquid pool

Experimental Investigation on Fuel Coolant Interaction Using Simulant Ceramic Melts in Water: Insights and Conclusions

Recent severe accident research synthesis of the major outcomes from the SARNET network

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