Application of REPAS Methodology to Assess the Reliability of Passive Safety Systems

Table 4

Critical parameters case b.

Critical parameter ID	Description	Unit	Nominal value	Range	Discrete initial value
X1	RPV Non-condensable fraction	—	0	0-1	0 0.01 0.1 0.2 0.5 0.8 1
					0.719 0.12 0.07 0.05 0.03 0.01 0.001
X2	Non-condensable fraction at the inlet of IC piping	—	0	0-1	0 0.01 0.1 0.2 0.5 0.8 1
					0.71 0.12 0.07 0.05 0.03 0.01 0.01
Θ	Inclination of the IC piping on the suction side	deg	0	0–10	0 1 5 10
					0.5 0.4 0.08 0.02
C2	Heat Losses piping –IC suction	kW	5	0–100	0 5 20 100
					0.10 0.7999 0.10 0.0001
L2 (0)	Initial condition liquid level –IC tubes, inner side	%	100	0–100	0 50 100
					0.10 0.10 0.80
UL	Undetected leakage	m^2	0	0–10𝑒^−5	0 1𝑒^−5 5𝑒^−5 10𝑒^−5
					0.8899 0.1 0.001 0,0001
POV	Partially opened valve in the IC discharge line	%	100	1–100	1 10 50 100
					0.001 0.01 0.1 0.889