Overview and Discussion of the OECD/NRC Benchmark Based on NUPEC PWR Subchannel and Bundle Tests

Table 4

Geometry and power shape for bundle test assemblies for void distribution benchmark.

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 circles: heated rod and circles with dots: thimble rod.
MV: mixing vane and NMV: non-mixing vane.
Spacer location is the distance from the bottom of heated length to spacer bottom face.