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Probability of Mark-I Containment Failure by Melt-Attack of

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Sample text

As long as the evaporation of water from the pool in the lower plenum is very low, the direct surface-to-surface radiation has a dominant effect. This situation changes dramatically when the core melting progresses to the extent that the lower core plate fails and molten corium is released into the lower plenum. The resultant evaporation, and the associated oxidation of the remaining zircaloy, increase the temperature of the steam/hydrogen mixture at core exit. The energy transfer from the gas to the upper structures via radiation and convection becomes an important (or even dominant) factor in the heatup of the latter.

29 metal oxide metal oxide 97 (98a, 96b) 3 (2a, 3b) 82 18 (a) and (b), respectively,referto the upperand lower bounds of mass released. 6. MOD3 results for Case 3 Time of RPV failure 172 mln Melting of RPV upper structures rltJrllll i iN iiiii i i Melting of RPV upper structures l l l ii,i, i i lrl, l l l ill,i IN l Durationofhigh meltingperiod,tm [mini 40 Averagemelting rateduring tm [kg/s] 21 Total molten massduring tm [kg] 50,000 Corlum release to the containment .................................

MOD3 code, in which the heatup, collapse and melting of the BWR steam separator/dryer complex are explicitly modeled. MOD3 predicted major characteristics of the melt during the phase of high release rates stay within the range of values used by Theofanous et al. [1990]. Therefore, it can be concluded that, within the scope of this work, the bounding conditions used in the NUREG/CR-5423 report seem to be adequate. 0 Introduction Although a considerable progress has been recently made in the understanding of the mechanisms governing severe accidents in nuclear power plants, any predictions of the propagation and consequences of hypothetical accidents using existing methodologies and computer codes are still associated with substantial uncertainties.

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