Results of recent KROTOS FCI tests: alumina versus corium melts

Huhtiniemi, I.; Magallon, D.; Hohmann, H.

doi:10.1016/s0029-5493(98)00269-6

Cited by 126 publications

(59 citation statements)

References 3 publications

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“…14,15) For the Al 2 O 3 tests, the average integral void fraction varied from 1.0 to 2.6% during this premixing phase. In general, these values are smaller than 4% measured in a narrow test section.…”

Section: Discussion On the Suppression Of A Vapor Explosionmentioning

confidence: 99%

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: Discussion On the Suppression Of A Vapor Explosionmentioning

confidence: 99%

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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“…Experimental and analytical researches are carried out using small-and large-scale experiments [11][12][13][14][15][16][17][18][19][20][21][22][23].…”

Section: Vapor Explosionmentioning

confidence: 99%

Review of thermal-hydraulic researches in severe accidents in light water reactors

Kataoka

2013

Journal of Nuclear Science and Technology

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The Tohoku Region Pacific Coast Earthquake and subsequent severe accident (SA) in Fukushima Daiichi Nuclear Power Station caused unprecedented disaster in Japan. Before this accident, considerable researches on SAs had been carried out in Japan. However, unfortunately, such researches could not prevent the accident due to the unexpected huge Tsunami. However, the researches on SAs become more and more important in order to make clear the causes of the accident in Fukushima and improve the safety of nuclear power plants in Japan. In view of this, review on researches on thermal hydraulics in SAs in light water reactors was carried out. Important thermal-hydraulic phenomena in SAs were identified. Research activities on each phenomenon were surveyed mainly based on the articles published in Journal of Nuclear Science and Technology of Atomic Energy Society of Japan.

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“…thermal fragmentation, resulting from the destabilization of the vapour film around the melt droplets, and hydrodynamic fragmentation, resulting from the velocity differences between the melt droplets and the surrounding medium, are considered. The diameter of the created fragments, which is a user parameter, was set to the code standard value 100 µm, which is based on KROTOS experiments (Huhtiniemi et al, 1999). The explosion is triggered by applying a user defined initial local pressure pulse.…”

Section: Modellingmentioning

confidence: 99%

“…In MC3D it is conservatively assumed that the melt droplets are completely molten if their bulk temperature is higher than the corium solidus temperature. This overpredicts the ability of corium droplets to efficiently participate in the explosion, since in reality, during premixing, a crust is formed on the corium droplets before the droplet bulk temperature drops below the solidus temperature (Huhtiniemi et al, 1999;Dinh, 2007). This crust inhibits the fine fragmentation process and if the crust is thick enough it completely prevents it.…”

Section: Modellingmentioning

confidence: 99%