Fig. 1. Diagram of MSRE residual heat removal system

Fig. 2. Diagram of liquid fuel molten salt reactor EDS-PRHRS

Fig. 3. Structure diagram of coolant thimble

Fig. 4. Change of molten salt level (a) and power (b) with time in EDS-PRHRS

Fig. 5. Change of temperature in EDS-PRHRs

Fig. 6. Schematic of the drain tank (a) and the square arrangement of thimble (b)

Fig. 7. Calculation model for heat exchange element (a) Side view, (b) Vertical view

Fig. 8. Verification results of mesh independence

Fig. 9. Verification results of time step independence

Fig. 10. Change of heat transfer power of outer wall with time

Fig. 11. Change of temperature contours at bottom region of salt zoon with time

Fig. 12. Change of water ring cavity vapor volume fraction with time

Fig. 13. Single thimble heat exchange power and decay heat power

Fig. 14. Changes of maximum temperature in outer wall and molten salt with time

Fig. 15. Variations of maximum temperatures of the outer tube wall, molten salt and the minimum temperature of molten salt under different heat exchange length

Fig. 16. Variations of maximum temperatures of outer tube wall, molten salt, and minimum temperature of molten salt at different drain time

Fig. 17. Variations of maximum temperatures of outer tube wall, molten salt, and minimum temperature of molten salt in different circulating mass flow

Fig. 18. Variations of outlet vapor mass flux and outer tube wall heat flux in different circulating mass flow with time

Fig. 19. Variations of maximum temperatures of outer tube wall, molten salt, and minimum temperature of molten salt in different gap materials with time

Fig. 20. Variations of maximum temperatures of outer tube wall, molten salt, and minimum temperature of molten salt in different gap emissivity with time

Fig. 21. Arrangement of heat exchange element (a) Square, (b) Triangular

Fig. 22. Variations of maximum temperatures of outer tube wall, molten salt, and minimum temperature of molten salt in different arrangements with time

Fig. 23. Arrangement of heat exchange element (a) Square, (b) Triangular

Fig. 24. Temperature distribution (5 000 s) along axial direction