Consistent Posttest Calculations for LOCA Scenarios in LOBI Integral Facility

Table 4

Resulting sequence of events, comparison between experimental test and calculated results of A1-84.

Events/set points	Time after experiment initiation (s)	Calculated time after transient initiation (s)
Break opening	0.0	0.0
SCRAM signal (at 13.2 MPa + delay 0.5 s)	1.0	1.0
Secondary side cooldown 100 K/h actuation (at 13.2 MPa + 1.5 s valve closure time)	1.3	13.0 (imposed by time)
Pressure in PS 11.7 MPa	5.0	4.76
MCPs start coastdown (at 11.0 MPa + delay 1.0 s)	7.0	7.0
Upper plenum in saturation conditions	15.8	19.3
HPIS actuation (at 11.7 MPa + delay 35 s)	40.0	39.76
PS pressure falls below SS pressure IL/BL	90.8/97.8	101.3/101.83
Occurrence of minimum primary side mass	347.4	350.0
Accumulator actuation IL/BL (at 2.8 MPa, disabled at 11 Mpa + delay 500 s in cold leg, not disabled in hot leg)	347.0/349.9	335.1/335.0
Auxiliary feedwater in broken loop	—	—
Accumulator injection stops Cold leg IL/BL	509.0/520.0	487.4/558.7
Accumulator injection stops Hot leg IL	849.0	849.0
End of the test (0.1 Mpa)	850.0	850.0