Time-Series Forecasting of a Typical PWR Undergoing Large Break LOCA

Table 2

Normalized uncertain parameters [28, 30].

Nos.	Parameter description	Mean, μ	PDF	Standard deviation, σ	Range, –
1	Core power	1.0	Normal	0.0155	0.9691–1.0309
2	Groeneveld-CHF	1.0	Normal	0.500	0.171–2.1711
3	Chen nucleate boiling HTC	1.0	Normal	0.234	0.382–1.618
4	Transition boiling HTC	1.0	Normal	0.230	0.54–1.46
5	Dittus–Boelter liquid HTC	1.0	Normal	0.196	0.607–1.393
6	Dittus–Boelter vapor HTC	1.0	Normal	0.196	0.607–1.393
7	Film boiling HTC	1.0	Normal	0.287	0.426–1.574
8	Break discharge coefficient	1.0	Normal	0.115	0.77–1.23
9	Decay heat	1.0	Normal	0.051	0.898–1.102
10	Oxidization dial	1.0	Normal	0.01	0.980–1.020
11	SIT actuation pressure	1.0	Normal	0.025	0.949–1.051
12	SIT loss coefficient	1.0	Normal	0.20	0.6–1.4
13	Pressurizer pressure	1.0	Normal	0.113	0.77–1.23
14	Fuel thermal conductivity	1.0	Normal	0.0773	0.8455–1.1545
15	Gap conductance	—	Uniform	—	0.75–1.50
16	Downcomer wall thermal conductivity	—	Uniform	—	1.0–2.0
17	SIT water inventory		Uniform		0.9634–1.0372
18	Pump two-phase head multiplier	—	Uniform	—	0.0–1.0
19	Pump two-phase torque multiplier	—	Uniform	—	0.0–1.0
20	SIT water temperature	—	Uniform	—	0.955–1.045
21	SIP (IRWST) water temperature	—	Uniform	—	0.936–1.064
22	SIP flow multiplier	—	Uniform	—	0.5–1.5
23	Pump K-factor	—	Uniform	—	0.239–0.577