Informing Performance Metrics of Advanced I&C Systems for Liquid Fueled Fast Molten Salt Reactors

Figures & data

Fig. 1. CNRS benchmark results.

TABLE I Design Parameters for the Reference MCFR Considered in the Present Study

Parameter	Value
Total thermal power	2500 MW(thermal)
Number of the primary loops	8
Fuel salt composition (in mol %)	65NaCl-35UCl3
Fuel salt in/out temperatures	923.14 K/1003.14 K
Diameter/length of hot leg and cold leg	0.5 m/2.0 m
Length of heat exchanger	2.5 m
Fuel salt transit time outside core	1.96 s
Average coolant salt temperature	823.14 K

TABLE II Fuel Salt and Structural Material Properties

	Fuel Salt	Lead	Stainless Steel
Density (kg/m^3)	4029.42	10284	8000
Specific heat (J/kg K)	476.86	145	500
Thermal conductivity (W/mK)	0.76	19.0	14.0
Viscosity (Pa s)	0.0011	–	–
Thermal expansion coefficient (1/K)	2.6E-04	–	–

Fig. 2. Simulation domain of the reference MCFR: (a) reactor vessel dimension and (b) reference MCFR system.

Fig. 3. Mesh convergence results.

Fig. 4. Steady-state simulation results of the reference MCFR.

Fig. 5. Locations of monitoring points.

Fig. 6. Temperature evolution in the core during ULOF.

Fig. 7. Local temperature evolution of the fuel salt and core components during ULOF.

Fig. 8. Temperature evolution in the core during ULOHS.

Fig. 9. Local temperature evolution of the fuel salt and core components during ULOHS.

TABLE III Maximum Temperature of the Core Components at 80 s During Unprotected Transients

	Steady State	ULOF	ULOHS
Fuel salt in core	1117.21 K	1666.90 K	1516.67 K
Axial bottom reflector	1115.78 K	1353.35 K	1441.09 K
Axial top reflector	1075.18 K	1515.51 K	1476.49 K
Radial reflector	976.14 K	1109.36 K	1267.76 K
Vessel wall	976.05 K	976.05 K	976.05 K

Fig. 10. Comparison of temperature evolution during flow rate fluctuation transients for the periods of 0.5- and 5.0-s cases.

Fig. 11. Temperature range and temporal temperature change of reactor structures during flow rate fluctuation transients: (a) temperature (•: initial value) and (b) dT/dt.

Fig. 12. Temperature evolution during heat sink fluctuation transients.

Fig. 13. Temperature range and temporal temperature change of reactor structures during heat sink fluctuation transients.