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RTAs | Parameters characterizing RTAs | Type | Exp. PHS-05 | ATHLET | CATHARE | RELAP5 |
Calc. | Q | Calc. | Q | Calc. | Q |
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(1) Primary system subcooled: 0 to 350 s |
Pressuriser emptying | Pressuriser empty | TSE | 350 s | 205 | M | 125 | M | 222 | M |
Primary pressure behaviour | Primary pressure at 8.8 MPa | TSE | 292 s | 284 | M | 184 | M | 321 | M |
Primary pressure at 350 s | SVP | 6.61 MPa | 6.36 | R | 7.42 | R | 7.57 | R |
Secondary pressure behaviour | Maximum secondary pressure | SVP | 5.34 MPa | 5.34 | R | 5.41 | R | 5.32 | E |
Secondary pressure at 350 s | SVP | 5.32 MPa | 5.33 | R | 5.33 | E | 5.28 | E |
Pump behaviour | Coast-down begins | TSE | 100 s | | E | 100 | E | 102 | E |
Coast-down ends | TSE | 248 s | | R | 236.7 | R | 250 | E |
Primary mass inventory | Average break flow | IPA | 0.019 kg/s | | M | 0.028 | M | 0.023 | R |
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(2) Reactor model emptying (LE11): 350 to 4720 s |
Primary pressure behaviour | Primary pressure at 1300 s | SVP | 6.31 MPa | 6.04 | R | 5.42 | R | 6.14 | R |
Primary pressure at 4720 s | SVP | 4.79 MPa | 5.28 | R | 5.34 | R | 4.84 | R |
Secondary pressure behaviour | Secondary pressure at 4720 s | TSE | 4.79 MPa | 5.07 | R | 5.23 | R | 4.80 | E |
Loop seal behaviour | Cold leg loop seal clearing | TSE | 3182 s | 3203 | E | 2920 | R | 3155 | E |
Hot leg loop seal clearing | TSE | 1272 s | 1192 | R | 1473 | R | 1204 | R |
Primary mass inventory | Average break flow | IPA | 0.011 kg/s | | R | 0.016 | R | 0.011 | E |
Primary temperature behaviour | Coolant temperature at core outlet at 4720 s | SVP | 534.7 K | 540.5 | R | 541.2 | R | 534.9 | E |
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(3) Core overheating, rewetting (TE15): 4720 to 5000 s |
Dryout occurrence | Onset of dryout | TSE | 4720 s | 4260 | R | 4905 | R | 5135 | R |
Minimum level in reactor model at (s) | SVP | 3.05 m 4760 s | 3.26 m 4590 s | R | 1.89 m 4908 s | R | 2.59 m | R |
Time of maximum cladding temperature | STS | 4768 s | 4360 | R | 4930 | R | 5160 | E |
Maximum cladding temperature | SVP | 613 K | 693 | R | 645.9 | R | 593 | R |
Rewetting | HPIS injection initiated | TSE | 4751 s | | R | 4924 | R | 5150 | R |
End of dryout | TSE | 5000 s | 4380 | R | 5000 | E | 5340 | R |
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(4) Primary inventory restoration (overfeeding of pressuriser): 5000 to 6997 s |
Primary pressure behaviour | Pressure at 5000 s | SVP | 4.61 MPa | 5.37 | R | 4.46 | R | 4.78 | R |
Primary temperature behaviour | Coolant temperature at core outlet at 5000 s | SVP | 532.1 K | 541.3 | E | 530 | E | 534.2 | E |
Coolant temperature at core inlet at 5000 s | SVP | 506.0 K | 511.1 | R | 508.9 | E | 518.7 | R |
Primary mass inventory | Average break flow | IPA | 0.019 kg/s | | R | 0.019 | E | 0.014 | R |
Total mass through the break | IPA | 94.9 kg | 99.0 | R | 110 | R | 84.8 | R |
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