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 points	Time after experiment initiation (s)	Calculated time after transient initiation (s)
Break opening	0.0	0.0
Secondary side cooldown 100 K/h actuation (at 13.2 MPa)	2.3	1.62
SCRAM signal (at 13.2 MPa + delay 0.5 s)	2.8	2.12
Saturation in hot legs	4.9	3.0
Saturation in upper plenum	5.0	3.0
Pressure in PS 11.7 MPa	7.0	8.01
MCPs start coastdown (at 10.8 MPa)	9.0	10.8
Pressurizer surge line uncovers	19.2	20.0
HPIS actuation (at 11.7 MPa + delay 35 s)	42.0	43.01
Saturation in lower plenum	42.0	34.0
MCPs stop	79.0	80.0
PS pressure falls below SS pressure	188.0	211.0
Broken loop seal clearance	200.0	275.0
Break uncovers	200.0	277.0
Intact loop seal clearance	230.0	273.0
Occurrence of minimum primary side mass	623.0	580.0
Accumulator actuation (at 2.8 MPa, disabled when accumulator water volume is 22 l (5% of total volume))	625.0	579.9
Auxiliary feedwater in broken loop (SG level < 5 m), at 7% of the nominal initial flow and 150°C	1023.0	1070.0
Accumulator injection stops	1683.0	2130.0
End of the test	1683.0	2790.0