Analysis of Void Fraction Distribution and Departure from Nucleate Boiling in Single Subchannel and Bundle Geometries Using Subchannel, System, and Computational Fluid Dynamics Codes

Table 3

Geometry and power shape for each bundle [2].

Item		Data
Assembly
Rods array	5 × 5	5 × 5	5 × 5
Number of heated rods	25	25	24
Number of thimble rods	0	0	1
Heated rod outer diameter (mm)	9.50	9.50	9.50
Thimble rod outer diameter (mm)	—	—	12.24
Heated rods pitch (mm)	12.60	12.60	12.60
Axial heated length (mm)	3658	3658	3658
Flow channel inner width (mm)	64.9	64.9	64.9
Radial power shape	A	A	B
Axial power shape	Uniform	Cosine	Cosine
Number of MV spacers	7	7	7
Number of NMV spacers	2	2	2
Number of simple spacers	8	8	8
MV spacer location (mm)	471, 925, 1378, 1832, 2285, 2739, 3247
NMV spacer location (mm)		2.5, 3755
Simple spacer location (mm)	237, 698, 1151, 1605, 2059, 2512, 2993, 3501

White circle: heated rod, gray circle: thimble rod.
MV: mixing vane. NMV: no mixing vane.
Spacer location is distance from bottom of heated length to spacer bottom face.