Deterministic Analysis of Natural Circulation Events at the Ignalina NPP

Table 2

Parameters which may impact the uncertainty of calculation results in sequential MCPs trip case.

No.	Parameter			Value of the			Explanation
		Width of parameter distribution		parameter in	Mean deviation	Probability
		Min.	Max.	the basic case	and error[%]	distribution
				calculation
Initial conditions
Par. 1	Pressure in	6.517·10^6	7.203·10^6	6.86·10^6	1.715·10^5[5%]	Normal	Measurement
	DS, Pa						error
Par. 2	Coolant flow rate	7154	7446	7300	73 [2%]	Normal	Measurement
	through single						error
	MCP, m^3/h
Par. 3	Feed water	458.52	467.78	463.15	2.32 [1%]	Normal	Measurement
	temperature, 𝐾						error
Par. 4	Steam flow rate to	81.34	84.66	83	0.83 [2%]	Normal	Measurement
	the in-house						error
	needs header, kg/s
Par. 5	Reactor thermal	2.247·10^9	2.387·10^9	2.317·10^9	3.48·10^7[3%]	Normal	Measurement
	power, W						error
Modelling parameters in the core
Par. 6	Water packing	0 (on)	1 (off)	1 (off)	—	Nonparametric	Model
							assumption
Par. 7	Stratification	0 (on)	1 (off)	0 (on)	—	Nonparametric	Model
							assumption
Par. 8	PV term	0 (off)	1	0 (off)	—	Nonparametric	Model
							assumption
Par. 9	CCFL	0 (off)	1 (on)	0 (off)	—	Nonparametric	Model
							assumption
Par.10	Thermal front	0 (off)	1 (on)	0 (off)	—	Nonparametric	Model
	tracking						assumption
Par.11	Mixture level	0 (off)	1 (on)	1 (on)	—	Nonparametric	Model
	tracking						assumption