Applying UPC Scaling-Up Methodology to the LSTF-PKL Counterpart Test
Table 6
Main events of LSTF Test 3.
Event
Experimental data (s)
UPC LSTF 1D nodalization (s)
UPC LSTF pseudo-3D nodalization (s)
High-pressure transient phase
—
—
—
Break
0
0
0
SCRAM signal
25
33
33
Turbine trip and closure MSIV
PZR heater off
Termination main feedwater
Initiation of coastdown of primary coolant pumps
31
39
39
Termination of continuous opening of SG relief valves, termination of two-phase natural circulation, and break flow from single-phase liquid to two-phase flow
600
1238
1185
Core liquid level starts to decrease (core uncovered)
1545
1460
1475
End high-pressure transient phase (PCT > 750 K)
1840
1852
1778
Conditioning phase
—
—
—
HPI system activated
1850
1862
1788
Break valve closed
2163
2169
2161
HPI system closed
2852
2852
2852
SG depressurization
2880
2892
2880
Termination of SG depressurization
3024
3008
3012
End of Conditioning phase (break valve reopening)
3323
3323
3323
Low-pressure transient phase
—
—
—
Break valve reopening
3323
3323
3323
Primary pressure lower than SG secondary pressure
4108
4085
4105
SG depressurization (CET > 623 K)
4392
4297
4388
Initiation of accumulator system (primary pressure = 2.6 Mpa)
4505
4419
4488
Initiation of LPI system (primary pressure = 1.0 Mpa)
