Benchmark Analysis on Loss-of-Flow-without-Scram Test of FFTF Using Refined SAC-3D Models

Table 1

Initial conditions of FFTF LOFWOS test #13 [4].

Parameter	Units	Value
Power	MWt	199.2
Core inlet temperature	K	590.4
Flow through all assemblies	kg/s	1988.42
Shield flow rate	kg/s	56.32
Leakage and bypass flow rate	kg/s	157.49
GEM sodium level^1	cm	221.6
		Loop 1	Loop 2	Loop 3
Primary pump speed	rpm	953.1	951.5	944.4
Primary loop flow rate	kg/s	736.91	735.68	729.65
Secondary pump speed	rpm	858.2	861	851.5
Secondary loop flow rate	kg/s	735.18	737.59	729.47
Average DHX Na outlet temperature	K	575.8	572.6	575.4
Secondary cold leg temperature^2	K	570.7	569.8	570.9

¹Elevation relative to the top of inlet nozzle holes.²Initial DHX outlet temperatures were higher than secondary cold leg temperatures, likely due to uncertainties and the location of the thermocouples within the DHX.