Assessment of Neutronic Characteristics of Accident-Tolerant Fuel and Claddings for CANDU Reactors

Table 11

Coolant void reactivity and fuel temperature coefficient for ATF.

Description	Enrichment; (wt%  ^235U)	Fresh fuel	Fresh fuel		Midburnup
			CVR	FTC	CVR	FTC
			(mk)	(pcm/K)	(mk)	(pcm/K)
UO2	0.711%	1.11850
	1.300%	1.35036
UO2 + 3% SiC	0.720%	1.12319
	1.320%	1.35597
UO2 + 6% SiC	0.720%	1.12203
UO2 + 10% SiC	0.730%	1.12577
UN	0.711%	1.11918
	1.220%	1.32137
UN + 3% U3Si2	0.711%	1.11907
UN + 6% U3Si2	0.711%	1.11929
UN + 10% U3Si2	0.711%	1.11905
UN + 10% ZrN	0.711%	1.11744
U-9Mo	0.930%	1.12952
UO2 FCM in SiC; 35% packing fraction	1.070%	1.18147
	1.890%	1.41177
UO2 FCM in SiC; 40% packing fraction	1.010%	1.17808
	1.620%	1.37165
	1.800%	1.41008
UO2 FCM in SiC; 45% packing fraction	0.950%	1.16881
	1.430%	1.33787
UO2 FCM in SiC; 50% packing fraction	0.910%	1.16434
	1.280%	1.30639
UO2 FCM in SiC; 55% packing fraction	0.880%	1.16149
	1.160%	1.27726
UO2 FCM (650 μm) in SiC; 40% packing fraction	1.010%	1.17804
	1.620%	1.37161
UO2 FCM (750 μm) in SiC; 40% packing fraction	1.010%	1.17809
	1.620%	1.37170
UN FCM in SiC; 35% packing fraction	0.930%	1.16290
	1.280%	1.29615
UN FCM in SiC; 40% packing fraction	0.890%	1.15883
	1.130%	1.25901
UN FCM in SiC; 45% packing fraction	0.850%	1.15066
	1.020%	1.22738
UN FCM in SiC; 50% packing fraction	0.820%	1.14447
	0.930%	1.19745
UN FCM in SiC; 55% packing fraction	0.800%	1.14123
	0.970%	1.17653
UN FCM in SiC; 55% TRISO packing fraction	2.250%	1.46143
UO2 + 3% SiC; zircaloy cladding	0.720%	1.12319
UO2 + 3% SiC; SiC cladding	0.711%	1.12010
UO2 + 3% SiC; zircaloy + FeCrAl cladding	0.790%	1.12855