Input Calibration and Validation of RELAP5 Against CIRCUS-IV Single Channel Tests on Natural Circulation Two-Phase Flow Instability

Table 3

Test section response to the variation of the input parameters.

Increased input parameter	System response
	Riser inlet temperature	Riser outlet temperature	Riser void	Inlet pressure
Inlet temperature	+	+	+	−
Riser heat loss	0	−	−	+
Heater power	+	+	+	−
Inlet loss coefficient	0	0	0	+
Outlet pressure	0	0	−	+

Increase: +, decrease: −, and no effect: 0.