Value;Meaning;Dimension;1;2;3 Hcore;"Fuel rod heating height";m Hic;"Interchannel space water level height";m Нch;"Channel swell level height";m "ρ mix";"Steam-water mixture density";kg/m3 Z;"FA fuel part axial point coordinate";m G;"Gravity acceleration";m/s2 ΔPfr;"Friction pressure loss";Pa ΔPac;"Flow acceleration pressure loss";Pa ρ';"Saturated water density";kg/m3 iin;"SFA channel inlet enthalpy";kJ/kg QFA;"SFA power";kV HFA;"SFA height";m q(z);"Power density value at axial point z";J/m m;"Number of groups of channels with assemblies" Sch;"Channel flow area";m2 nch;"Number of channels" Sia;"Interassembly (interchannel) space flow area";m2 Nch;"Channel power";W r;"Specific heat of evaporation";J/kg "Gst inch";"Top rack channel inlet steam flow rate";kg/s Δτ;"Time interval";s Gcl;"SFP coolant leak rate";kg/s Nf;"Fuel rod power";W Hf;"Fuel rod heating height";m ΔQszr;"Steam-zirconium reaction heat";W "a z";"Fuel-to-steam heat-transfer coefficient";W/(m2×K) Ff;"Fuel heat-exchange surface";m2 tf;"Fuel rod temperature";°C tst;"Steam temperature";°C Cp;"Specific heat capacity of water";J/(kg×K) ΔPd;"Drag pressure loss";Pa "ξ l";"Local drag coefficient";– "ξ r";"Friction resistance coefficient";– Dh;"Hydraulic diameter";m wc;"Coolant circulation rate";m/s Ψ;"Two-phase flow inhomogeneity correction factor";– x;"Mass void fraction";– "ρ""";"Saturated steam density";kg/m3 "φ (z)";"Channel void fraction";– Gc;"Coolant natural circulation rate";kg/s