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

Table 5

Calculated inlet flow rate, oscillation period, and errors normalized to the experiment, tests I-2 and I-1.

	TRACE		RELAP5		Experiment
	Calc.	(Calc. − Exp.)/Exp., %	Calc.	(Calc. − Exp.)/Exp., %
Test I-2
Inlet flow rate (L/s)
Average	0.106	−16.1	0.126	0.2	0.126
Max.	0.361	27.9	0.329	16.6	0.282
Min.	0.028	−0.6	0.036	26.4	0.029
Oscillation period (s)	13.4	−6.3	14.2	−0.5	14.3
Test I-1
Inlet flow rate (L/s)
Average	0.052	−10.0	0.062	7.1	0.058
Max.	0.371	58.2	0.225	−4.3	0.235
Min.	0.030	26.2	0.031	31.7	0.024
Oscillation period (s)	47.8	−2.6	62.4	27.1	49.1