OECD/NRC PSBT Benchmark: Investigating the CATHARE2 Capability to Predict Void Fraction in PWR Fuel Bundle

Table 5

PSBT steady-state bundles (TS 5, TS 6, TS 7, TS 8,): summary of reference calculations results by CATHARE2 3D model.

Void fraction	TS 5			TS 6			TS 7			TS 8
	⟨𝜀[𝛼]⟩	𝜎[𝜀]	Number	⟨𝜀[𝛼]⟩	𝜎[𝜀]	Number	⟨𝜀[𝛼]⟩	𝜎[𝜀]	Number	⟨𝜀[𝛼]⟩	𝜎[𝜀]	Number
0.0–0.05	0.1003	0.0448	54	0.0931	0.0351	53	0.1031	0.0468	53	0.0469	0.0290	17
0.05–0.10	0.0895	0.0396	21	0.1074	0.0295	21	0.1068	0.0491	21	0.0425	0.0606	3
0.10–0.15	0.1017	0.0644	15	0.1511	0.0785	19	0.1310	0.0718	19	0.0102	0.0514	4
0.15–0.20	0.0801	0.0615	15	0.1408	0.0836	11	0.1323	0.0778	11	0.0392	0.0675	7
0.20–0.30	0.0464	0.0639	26	0.0951	0.0567	21	0.1134	0.0598	21	−0.0333	0.0783	10
0.30–0.40	0.0335	0.0568	27	0.0827	0.0541	33	0.1050	0.0741	33	−0.0344	0.0741	19
0.40–0.60	0.0827	0.0612	48	0.0946	0.0694	47	0.0603	0.0514	47	0.0144	0.0771	25
0.60–0.80	0.0256	0.0388	13	0.0253	0.0555	17	−0.0908	0.0796	17	0.0310	0.0285	8
0.80–1.00	—	—	0	—	—	0	−0.2784	—	0	—	—	0
0.0–1.00 (total)	0.061	0.0599	219	0.091	0.0651	222	0.082	0.0939	222	0.014	0.0675	93