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

Table 1

Test conditions and regimes.

Test	System pressure; (bar)	Heater power; (kW)	Inlet water temperature; (°C)	Test regime
S-1	1	2.5	89.7	Single phase steady state
I-1	1	2.5	92.8	Two-phase instability
I-2	1	2.5	99.8	Two-phase instability