An Investigation of the Particle Size Responses for Various Fuel-Coolant Interactions in the TROI Experiments

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

doi:10.13182/nt08-a3912

Cited by 11 publications

(5 citation statements)

References 11 publications

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“…This figure shows that the mass fraction of the fine particles, smaller than 0.425 mm, is 27.5 %. This is a big amount when compared with non-explosive tests (less than 10 %) [17]. Furthermore, the mass mean diameter is as small as 1.2 mm.…”

Section: Troi-51 Test Resultsmentioning

confidence: 90%

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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Section: Troi-51 Test Resultsmentioning

confidence: 90%

Steam explosion experiments using partially oxidized corium

et al. 2008

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“…Severity of consequences depends largely on the melt release states from RPY. Major processes constituting various ex-vessel phenomena are containment thermohydraulics, fission products transport, and melt dispersion [1,[7][8][9][10][11][12][13][14][15][16][17][20][21][22].…”

Section: B Ex-vessel Phenomenamentioning

confidence: 99%

“…Aerosols may also become airborne due to revolatization from sump pools. Bulk steam condensation over structural surfaces and aerosol particles in presence of non condensable gases is an important process with respect to the source term leakage/release into the environment [6,20,22].…”

Section: ) Fission Products Transportmentioning

confidence: 99%

Issues on containment integrity during severe accidents

Bishnoi

Gupta

2010

2010 2nd International Conference on Reliability, Safety and Hazard - Risk-Based Technologies and Physics-of-Failure Methods (I

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Containment threats during severe accidents may arise due to fuel coolant interactions, hydrogen combustion, molten core-concrete interactions, and long-term pressure and temperature loading. The objective of the paper is to bring out important issues in the assessment of containment integrity during severe accidents for PWR and PHWR. The issues are identified by extensive review and synthesis of information from literature on severe accident phenomena, severe accident analysis and containment integrity assessment.

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“…An investigation into the particle size distribution for the TROI tests was required, and the details were explained in a previous work. 12) Table 2 shows the TROI experimental results with different compositions -TROI-2, TROI-11, TROI-18, TROI-29, and TROI-32 -in which steam explosions did not occur. The difference in the particle size response between the zirconia/water system and the corium/water system was in the major group of particles in the mass.…”

Section: Analyses Of a Particle Size Distribution For The Troi Tmentioning

confidence: 99%

A Mechanism for the Suppression of a Steam Explosion in Real Core Melt and Water Interactions

Park

Kim

Min

et al. 2010

Journal of Nuclear Science and Technology

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TROI experiments1) have been performed to reveal unsolved issues of a steam explosion by using real core material at the Korea Atomic Energy Research Institute (KAERI). One of the findings from the TROI experiments is that the results of a fuel coolant interaction (FCI) are strongly dependent on the composition of corium, which is composed of UO 2 , ZrO 2 , Zr, and steel. The TEXAS-V simulation for the TROI experiments indicated that a relatively low void fraction seems to have resulted in a strong steam explosion, and the low-voided mixture seems to have been induced by large-sized particles. The particle sizes in the nonexplosive TROI tests were analyzed because the explosive tests do not represent the particles during mixing. The analysis of particle sizes indicated that the debris size reflected the material difference, and the order of the particle size for each melt material was the same as that in the TEXAS-V simulation. The TEXAS-V calculation for the alumina/water system indicated that thermal conductivity is also related to the material effect on the FCI result. A heat loss evaluation using a single-sphere, filmboiling model showed that reliable values for thermal conductivity and particle size provide a reasonable estimation for the FCI result. The steam explosion in corium/water interactions is suppressed by a smaller particle size and an induced larger heat loss during mixing.

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An Investigation of the Particle Size Responses for Various Fuel-Coolant Interactions in the TROI Experiments

Cited by 11 publications

References 11 publications

Steam explosion experiments using partially oxidized corium

Steam explosion experiments using partially oxidized corium

Issues on containment integrity during severe accidents

A Mechanism for the Suppression of a Steam Explosion in Real Core Melt and Water Interactions

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