Science and Technology of Nuclear Installations / 2015 / Article / Tab 2

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 descriptionMost Likely ValueRangeDistribution

= HTCMCRAxial heat transfer coefficient (HTC) from molten corium to lower crust3,500 (W/m2C)2,450, 4,550Triangle

= HTCMCSRadial HTC from molten corium to side crust3,000 (W/m2C)2,100, 3,900Triangle

= FCHFFlat plate CHF critical velocity coefficient0.10.0036, 0.3Log uniform

= HTFBFilm boiling HTC from corium to an overlying pool300 (W/m2C)100, 400Triangle

= LHDECEnergy absorbed in endothermic chemical reactions during basaltic concrete decomposition275,000 (J/kg)192,500, 357,500Triangle

= LHCNLatent heat of concrete melting560,000 (J/kg)392,000, 728,000Triangle

= DCSRCNRebar density600 (kg/m3)420, 780Triangle

= ACMPLB(1)Corium debris surface area in the calandria vault62.5450.03, 62.54Uniform

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