Science and Technology of Nuclear Installations / 2012 / Article / Tab 2

Research Article

Consistent Posttest Calculations for LOCA Scenarios in LOBI Integral Facility

Table 2

Sequence of main events for test BL-30 experimental and posttest calculation.

Events/set pointsTime after experiment initiation (s)Calculated time after transient initiation (s)

Break opening0.00.0
Secondary side cooldown 100 K/h actuation (at 13.2 MPa)2.31.62
SCRAM signal (at 13.2 MPa + delay 0.5 s)2.82.12
Saturation in hot legs4.93.0
Saturation in upper plenum5.03.0
Pressure in PS 11.7 MPa7.08.01
MCPs start coastdown (at 10.8 MPa)9.010.8
Pressurizer surge line uncovers19.220.0
HPIS actuation (at 11.7 MPa + delay 35 s)42.043.01
Saturation in lower plenum42.034.0
MCPs stop79.080.0
PS pressure falls below SS pressure188.0211.0
Broken loop seal clearance200.0275.0
Break uncovers200.0277.0
Intact loop seal clearance230.0273.0
Occurrence of minimum primary side mass623.0580.0
Accumulator actuation (at 2.8 MPa, disabled when accumulator water volume is 22 l (5% of total volume))625.0579.9
Auxiliary feedwater in broken loop (SG level < 5 m), at 7% of the nominal initial flow and 150°C1023.01070.0
Accumulator injection stops1683.02130.0
End of the test1683.02790.0

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