Natural Circulation Characteristics at Low-Pressure Conditions through PANDA Experiments and ATHLET Simulations

Table 4

Oscillation period and decay ratio calculated from the DC mass flow (Exp. = experiment, Cal. = ATHLET calculation).

Test	Period (s)		Decay ratio (–)
	Exp.	Cal.	Exp.	Cal.
B3.3	200.0	204.8	—	0.66
B5.2	154.0	170.7	—	0.61
L5.3	120.0	113.8	0.68	0.62
LL5.3	90.0	102.4	0.74	0.55
B8.3	63.0	68.3	0.61	0.60