Fig. 1. Diagram of neutron calculation model of MegaPower heat pipe reactor (color online)

Fig. 2. Schematics of 2D heat transfer calculation model of MegaPower heat pipe reactor (color online)

Fig. 3. Diagram of mechanical calculation model of MegaPower heat pipe reactor

Fig. 4. The coupling relationship between multiple physical fields in a heat pipe stack

Fig. 5. Comparison of power distribution prediction between POD-RBF model and high-resolution model (color online)

Fig. 6. Histogram of power prediction errors between POD-RBF model and high-resolution model

Fig. 7. Flowchart of calculation process of MegaPower startup

Fig. 8. Temperature variation curves during low-power startup (color online)

Fig. 9. Variation curves of control drum angle and reactivity during low-power startup (color online)

Fig. 10. Temperature variation curves during power adjustment to nominal level (color online)

Fig. 11. Curves of control drum angle and reactivity over time during power adjustment to nominal level (color online)