Research Article
Simulation and Analysis of Small Break LOCA for AP1000 Using RELAP5-MV and Its Comparison with NOTRUMP Code
Table 1
AP1000 safety system actuation set point during SBLOCA [
5].
| | System/function | Actuation set points | Time delays (sec) |
| | Reactor trip | 12.41 MPa | 2.0 | | “S” signal generation | 11.72 MPa | 2.0 | | SG feed-water control valves start to close | After reactor trip signal | 3.2 | | Main steam isolation valves start to close | After “S” signal | 4.8 | | Reactor coolant pumps trip | After “S” signal | 6.0 | | PRHRS isolation valve starts to open | After “S” signal | 0.0 | | CMT actuation | After “S” signal | 0.0 | | Accumulator actuation | 4.83 MPa | 0.0 | | ADS-1 actuation | After CMT water volume reduces to 67.5% | 20.0 | | ADS-2 actuation | 70 s after ADS-1 actuation | 30.0 | | ADS-3 actuation | 120 s after ADS-2 actuation | 30.0 | | ADS-4A actuation | 20.0% liquid volume fraction in CMT | 2.0 | | ADS-4B actuation | 60 s after ADS-4A actuation | 2.0 | | IRWST injection | Pressure < 89.6 kPa + the containment pressure | 2.0 |
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