Bootstrap and Order Statistics for Quantifying Thermal-Hydraulic Code Uncertainties in the Estimation of Safety Margins

Table 1

Parameters which are regarded relevant with respect to the behaviour of the fuel cladding temperature [21].

Parameter	Range of parameter distribution		Mean	Standard deviations	Probability distribution
	Min	Max
Initial conditions
𝑥1 (pressure in DS) [Pa]	6.79𝐸+ 06	6.93𝐸+ 06	6.86𝐸+ 06	3.43𝐸+ 04	Normal
𝑥2 (coolant flow rate) [m^3/h]	6860	7140	7000	70	Normal
𝑥3 (feedwater temperature) [K]	458.52	467.78	463.15	2.32	Normal
𝑥4 (steam for in-house needs) [m^3/h]	227.7	232.3	230	1.15	Normal
𝑥5 (reactor thermal power) [W]	2.81𝐸+ 09	2.99𝐸+ 09	2.90𝐸+ 09	4.5𝐸+ 07	Normal
Modelling parameters
𝑥6 (water packing)	0 (on)	1 (off)	1 (off)	—	Discrete
𝑥7 (stratification)	0 (on)	1 (off)	0 (on)	—	Discrete
𝑥8 (PV term)	0 (on)	1 (off)	0 (off)	—	Discrete
𝑥9 (CCFL)	0 (on)	1 (off)	0 (off)	—	Discrete
𝑥10 (thermal front tracking)	0 (on)	1 (off)	0 (off)	—	Discrete
𝑥11 (mixture level tracking)	0 (on)	1 (off)	1 (on)	—	Discrete
𝑥12 (scram initiation time)	5.3	6.3	6.0	0.25	Normal