Benchmark of Subchannel Code VIPRE-W with PSBT Void and Temperature Test Data

Table 1

Description of PSBT void and mixing tests.

Parameter	B5	B6	B7	A1
Number of heated rods	25	25	24	25
Heated rod (OD) (mm)	9.50	9.50	9.50	9.50
Thimble rod OD (mm)	—	—	12.24	—
Rod-to-rod pitch (mm)	12.60	12.60	12.60	12.60
Test section inner width (mm)	64.9	64.9	64.9	64.9
Axial power profile	Uniform	Cosine	Cosine	Uniform
Hot/cold rod power ratio	1.00/0.85	1.00/0.85	1.00/0.85	1.00/0.25
Grid spacers and axial elevations (mm)	7 mixing vane grid spacers:
	471, 925, 1378, 1832, 2285, 2739, 3247
	2 nonmixing vane grid spacers:
	2.5, 3755
	8 simple support grid spacers:
	237, 698, 1151, 1605, 2059, 2512, 2993, 3501
Test description	Steady-state and	Steady-state	Steady-state	Steady-state
	transient void	and transient void	and transient void	mixing