Research Article
Simulation and Analysis of Small Break LOCA for AP1000 Using RELAP5-MV and Its Comparison with NOTRUMP Code
Table 3
Sequence of events during 10-inch SBLOCA in AP1000 by RELAP5-MV and NOTRUMP.
| | Event | REALP5-MV | NOTRUMP [7] | RELAP5 [5] |
| | Break opens | 00.0 | 00.0 | 00.0 | | Reactor trip signal | 5.5 | 5.2 | 4.7 | | “S” signal | 8.0 | 6.4 | 6.5 | | Main feed isolation valves begin to close | 8.2 | 8.4 | 7.9 | | Steam turbine stop valves close | 9.8 | 11.2 | 11.4 | | Reactor coolant pumps start to coast down | 12 | 12.4 | 12.5 | | Accumulator injection starts | 94 | 85.0 | 106.6 | | Accumulator-1 empties | 440 | 418.2 | 385.4 | | Accumulator-2 empties | 442 | 425.5 | 390.0 | | ADS stage 1 | 732 | 750.0 | 728.8 | | ADS stage 2 | 802 | 820.0 | 798.8 | | ADS stage 3 | 922 | 940.0 | 918.8 | | ADS stage 4 | 1181 | 1491.0 | 41284 |
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