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

Table 6

Main results of FFTF LOFWOS test #13 neutronics benchmark analysis

	Argonne	IGCAR	INEST	IPPE	JAEA	KIT	KTH	PSI	ROME	NCEPU
Neutron multiplication factor	1.000	0.998	0.999	0.992	1.017	0.998	1.022	1.006	1.000	0.998
Delayed neutron fraction	0.003	0.003	0.007	0.003	0.003	0.004	0.003	0.003	0.003	0.003
Axial expansion coefficient (pcm/°C)	−0.32	−0.23	—	—	−0.32	−	−0.3	−0.22	−0.48	−0.3
Radial expansion coefficient (pcm/°C)	−1	−1.22	—	—	−1	−	−0.93	−1.52	−5.87	−0.94
Fuel Doppler constant (pcm)	−629	−508	—	—	−634	−509	−564	−658	−688	−524
Fuel density coefficient (pcm)	−1.36	−1.45	—	—	−0.45	—	−1.36	−1.36	−1.4	−1.32
Structure density coefficient (pcm)	−0.12	0.2	—	—	0.03	—	0.1	0.04	−0.1	−0.01
Sodium density coefficient (pcm/°C)	−0.35	−0.91	—	—	−0.41	0.09	−0.94	−0.27	−1.91	−0.37
Control and safety rods (pcm)	−11849	—	—	−9396	10800	—	−11540	−11823	−12773	−8343
Gas expansion modules (pcm)	−442	−498	—	−516	−489	−448	420	−475	−1201	−782