| Symbol | Description | Value and Units |
| Ad | Area of the coolant in the accumulation tank | 3 m2 |
| Adw | Area of coolant in recirculation region | 10.3 m2 |
| Cm | Specific heat capacity of metal tubes | 460 J/(kg˚C) |
| Cs | Conversion factor between Wso and Psat | 80 kg/(s MPa) |
| K | thermal conductivity of metal tube | 55.0012 Jsm˚C |
| L | height of U-tube | 10.83 m |
| Ld | Height of accumulation tank | 10.83 m |
| Lsb | height of liquid | 1.057 m |
| M3 | Mass of half of total metal tube upward | 25,600 kg |
| M4 | Mass of half of total metal tube downward | 25,600 kg |
| N | total number of U-tubes | 3388 |
| Ravg | (Rin + Rout)/2 | 10.357 cm |
| Rin | inner radius of U-Tube | 9.75 cm |
| Rout | outer radius of U-Tube | 11 cm |
| Tfi | Temperature of inlet feed water | 223˚C |
| Tp | Temperature of primary water | 312˚C |
| Ums | heat transfer coefficient between the metal tubes and the secondary water | J/(s m2˚C) |
| Vdr | Volume of drum | 124.5 m3 |
| Vr | Internal volume of Liquid/Vapor separator | 13.3 m3 |
| Vs | volume of the secondary coolant in the effective heat exchange region | 94.4 m3 |
| Wp | Flow rate of primary water | 4950 kg/s |
| ρd | metal tube density | 8490 |
| ρm | Density of metal tube | 8500 kg/m3 |