Research Article
Uncertainty Analysis of the Potential Hazard of MCCI during Severe Accidents for the CANDU6 Plant
Table 2
MCCI phenomena related uncertain parameters and distribution assumption.
| | MAAP uncertainty parameters () | Parameter description | Most Likely Value | Range | Distribution |
| | = HTCMCR | Axial heat transfer coefficient (HTC) from molten corium to lower crust | 3,500 (W/m2C) | 2,450, 4,550 | Triangle |
| | = HTCMCS | Radial HTC from molten corium to side crust | 3,000 (W/m2C) | 2,100, 3,900 | Triangle |
| | = FCHF | Flat plate CHF critical velocity coefficient | 0.1 | 0.0036, 0.3 | Log uniform |
| | = HTFB | Film boiling HTC from corium to an overlying pool | 300 (W/m2C) | 100, 400 | Triangle |
| | = LHDEC | Energy absorbed in endothermic chemical reactions during basaltic concrete decomposition | 275,000 (J/kg) | 192,500, 357,500 | Triangle |
| | = LHCN | Latent heat of concrete melting | 560,000 (J/kg) | 392,000, 728,000 | Triangle |
| | = DCSRCN | Rebar density | 600 (kg/m3) | 420, 780 | Triangle |
| | = ACMPLB(1) | Corium debris surface area in the calandria vault | 62.54 | 50.03, 62.54 | Uniform |
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