Results of the Triggered Steam Explosions from the TROI Experiment

Kim, J. H.; Park, I. K.; Min, B.T.; Hong, Sup; Song, Jin Ho; Kim, H. D.

doi:10.13182/nt07-a3849

Cited by 9 publications

(3 citation statements)

References 10 publications

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“…12. The trend of the composition effect in the TEXAS-V calculations agrees well with the TROI test results, 20,21) in which the melt composition has an effect on steam explosion occurrence probability and steam explosion strength. From the test results, ZrO 2 is much more explosive than corium, and the 70:30 corium is the most explosive among several corium compositions.…”

Section: Analysis Resultssupporting

confidence: 82%

Suppression Features of a Vapor Explosion with Prototypic Reactor Materials

Hong

Kim

Min

et al. 2009

Journal of Nuclear Science and Technology

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The suppression of a vapor explosion is reviewed from a void fraction point of view from previous research results and the results of an experiment and analysis for TROI using a prototypic reactor material. In a tin-water system, a high fraction of air which played the role of steam reduced the peak pressure of a steam explosion. According to the sensitivity analysis that was carried out with an increase in vapor volume fraction, an energetic vapor explosion hardly took place in a mixture with a high void fraction. Under higher vapor fraction conditions ( v > 0:3), the vapor explosion was very weak. The prototypic corium showed a relatively high void fraction compared to ZrO 2 , which is known as an explosive material, because this corium system generates many smaller particles compared to the ZrO 2 system. Also this corium system showed a relatively low explosivity compared to the ZrO 2 system because the high void fraction of the corium system prevents contact between water and hot melt drops in the triggering stage. When considering the experimental results for the role of air instead of steam, an air supply system to provide a high volume fraction during a premixing process can radically prevent and/or mitigate a steam explosion.

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Section: Analysis Resultssupporting

confidence: 82%

Suppression Features of a Vapor Explosion with Prototypic Reactor Materials

Hong

Kim

Min

et al. 2009

Journal of Nuclear Science and Technology

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“…The maximum value was quite high at 580 kN, which is much stronger than those (~ 300 kN) from the previous tests with oxidic corium. The dynamic load from a strong steam explosion with oxidic corium among the previous tests [12] is presented in Fig. 7.…”

Section: Troi-51 Test Resultsmentioning

confidence: 99%

“…Meanwhile, in the TROI (Test for Real cOrium Interaction with water) experiments performed at KAERI (Korea Atomic Energy Research Institute), the occurrence of a spontaneous or triggered steam explosion was found to be related to the composition of a corium melt [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Steam explosion experiments using partially oxidized corium

et al. 2008

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Two steam explosion experiments were performed in the TROI (Test for Real cOrium Interaction with water) facility by using partially oxidized molten corium (core material), which is produced during a postulated core melt accident in a nuclear reactor. A triggered steam explosion occurred in one case, but none occurred in the other case. The dynamic pressure and the dynamic load measured in the former experiment show a stronger explosion than those performed previously with oxidic corium. Meanwhile, a steam explosion is prohibited when the melt temperature is low, because the melt is easily solidified to prevent a liquid-liquid interaction. The partially oxidized corium could enhance the strength of a steam explosion due to the thermal energy from an exothermic chemical reaction between the water and the uranium metal with a sufficient superheat extracted during melting. The melt composition effect on a steam explosion load, which was not included during the nuclear design, needs to be included in it.

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Fuel coolant interaction

Nayak¹,

Kulkarni²

2021

Severe Accidents in Nuclear Reactors

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Results of the Triggered Steam Explosions from the TROI Experiment

Cited by 9 publications

References 10 publications

Suppression Features of a Vapor Explosion with Prototypic Reactor Materials

Suppression Features of a Vapor Explosion with Prototypic Reactor Materials

Steam explosion experiments using partially oxidized corium

Fuel coolant interaction

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