Stand-Alone Containment Analysis of the Phébus FPT Tests with the ASTEC and the MELCOR Codes: The FPT-0 Test

Table 4

Summary of the sensitivity cases performed and importance for the ASTEC and MELCOR results.

Parameter	Importance for ASTEC calculations	Importance for MELCOR calculations
I^- partitioning among sump water and atmosphere	∖	High
HIO partitioning among sump water and atmosphere	∖	High
Aerosol deposition velocity for each aerosol component	Low	∖
Dynamic shape factor for agglomeration processes	High	High
Collision efficiency for gravitational and turbulent coagulation	High	∖
Aerosol density	High	High
Dynamic calculation of the time-step + Surface tension of a droplet in the atmosphere	Low	∖
Agglomeration shape factor	High	High
Consideration of the aerosol particles presence for calculating the gas density	Low	∖
Number of particle size classes	High	High
Aerosol mass median diameter	High	High
Geometric standard deviation	Low	Low
Particle sticking probability	High	High
Thickness of water film used for drainage and aerosol washdown	Low	∖
Thermal conductivity of gas divided by thermal conductivity of aerosol particle	Low	Low
Turbulence dissipation rate	Minor	High
Molecular weight of gas	Minor	∖
Diffusion boundary layer thickness	∖	Minor
Thermal accommodation coefficient	∖	Minor
Particle slip coefficient	∖	Minor
Condensation onto wet aerosols	∖	Low