Reactor Coolant Properties: helium_HTGR
Thermophysical properties of nuclear reactor coolants at operating temperatures and pressures. Covers light water (H2O) for PWR at 15.5 MPa (270-340°C) and BWR at 7 MPa (270-280°C), heavy water D2O for CANDU at 10 MPa (250-310°C), helium gas for HTGR/VHTR at 7 MPa (250-750°C), liquid sodium for SFR/LMFBR at near-atmospheric pressure (200-550°C), and molten salt FLiBe (2LiF-BeF2) for MSR (500-700°C). Properties: density, dynamic viscosity, thermal conductivity, specific heat, Prandtl number. Distinct from standard steam tables which do not cover D2O, sodium, helium, or FLiBe at reactor conditions.
| coolant type | temperature C | density kg m3 (kg/m3) | dynamic viscosity uPa s (uPa*s) | notes | prandtl number (dimensionless) | pressure MPa (MPa) | reactor type | specific heat J kgK (J/kgK) | thermal conductivity W mK (W/mK) |
|---|---|---|---|---|---|---|---|---|---|
| helium_HTGR | 250 | 5.89 | 26.4 | Helium at 7 MPa reactor inlet; ideal-gas Cp≈5193 J/kgK (constant); rho=PM/RT | 0.831 | 7 | HTGR | 5,193 | 0.165 |
| helium_HTGR | 350 | 5.23 | 28.8 | Helium slightly non-ideal at 7 MPa; viscosity follows power law T^0.67 | 0.827 | 7 | HTGR | 5,193 | 0.181 |
| helium_HTGR | 450 | 4.71 | 31.2 | Mid-core helium HTGR (GT-MHR / PBMR range) | 0.825 | 7 | HTGR | 5,193 | 0.196 |
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