Prediction of Flow Regimes and Thermal Hydraulic Parameters in Two-Phase Natural Circulation by RELAP5 and TRACE Codes

Table 7

Inlet flow rate and oscillation period from calculations with varying bubbly-to-slug transition boundary and the experiment.

	RELAP5				Exp.
	0.25	0.05	0.001 (default)	≤10^−5
Inlet flow rate (L/s)				Numerically unstable
Average	0.123	0.123	0.126		0.126
Max.	0.382	0.359	0.329		0.282
Min.	0.032	0.034	0.036		0.029
Oscillation period (s)	13.2	13.9	14.2		14.3