Research Article
Numerical Simulations and Design Optimization of the PHT Loop of Natural Circulation BWR
Table 3
Design parameters at minimum material condition.
| Parameter | Design 1 | Design 2 | Design 3 |
| Pressure | 70 bar | 70 bar | 70 bar | Power | 220 MW | 220 MW | 220 MW | Core inlet
enthalpy | 1204.8 kJ/kg | 1204.8 kJ/kg | 1204.8 kJ/kg | Factor of
safety | 1.4 | 1.4 | 1.5 | Mass flux | 1000 kg/m2-s | 800 kg/m2-s | 1000 kg/m2-s | Coolant
channel diameter | 0.1076 m | 0.1128 m | 0.1105 m | Active core
length | 3.8262 m | 3.389 m | 6.1964 m | Riser diameter | 0.1018 m | 0.1063 m | 0.1277 m | Riser length | 27.5323 m | 20.0 m | 28.3428 m | Area of the
downcomer | 0.1007 m2 | 0.1011 m2 | 0.1381 m2 | Diameter of
the fuel rod | 0.011 m | 0.011 m | 0.011 m | Number of
coolant channels | 113 | 113 | 113 | Number of fuel
rods | 54 | 54 | 54 | Volume of
material | 4.0 m3 | 3.1138 m3 | 5.9441 m3 | Core
exit void fraction | 0.8034 | 0.8025 | 0.778 | Stability
margin | 0.0902 | 0.1069 | 0.1481 |
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