Effect of Molten Corium Behavior Uncertainty on the Severe Accident Progress

Table 1

The information of PDF about selected uncertainty parameters.

Uncertainty parameter	Distribution type	Distribution parameters	Lower bound	Upper bound
Zircaloy melt breakout temperature (SC1131(2))	Scaled beta	α: 3.83; β: 3.0	2,100 K	2,540 K
Molten clad drainage rate (SC1141(2))	Log triangular	Mode: 0.2	0.1 kg/m-s	2.0 kg/m-s
Radial solid/molten debris relocation time constant (SC1020(1)/SC1020(2))	Uniform	-	Molten: 10 s; Solid: 100 s	Molten: 100 s; Solid: 1,000 s
Effective temperature at which the eutectic formed from UO2 and ZrO2 melts (SC1132(1))	Normal	Mean: 2,479 K; σ: 83 K	-	-