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 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 |
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