Review Article
Thermal-Hydraulic System Codes in Nulcear Reactor Safety and Qualification Procedures
| | UNIT | EXP | UNIPI 91BN1OLPSI | CEA c2m4_lcea | Judgment UNIPI/CEA |
| RTA: pressurizer emptying | |
| TSE | Emptying time* | s | 131 | 46 | — | R/- | Scram time | s | 41 | 38 | 41 | R/E |
| RTA: steam generators secondary side behaviour | |
| TSE | Main feed water off, turbine bypass | s | 59 | 55 | 42 | E/R | SVP | Difference between PS and SG 1 SS pressure at 100 s | MPa | 0.42 | 0.33 | 0.37 | R/R |
| SVP | SG 1 mass | Kg/(s) | | | | | at the end of subcooled blowdown | 774/(82) | 781/(75) | 761/(82) | E/E | when PS pressure equals SG 1 SS pressure | 869/(618) | 938/(408) | 847/(463) | R/R | when ACC starts | 804/(2955) | 802/(3019) | 788/(3075) | E/R | when LPIS starts | 938/(5176) | 1126/(6529) | 956/(5474) | R/R |
| SYP | SG 1 pressure | MPa | | | | | at the end of subcooled blowdown | 7.15 | 7.10 | 7.05 | E/E | when PS pressure equals SS pressure | 6.95 | 7.04 | 7.03 | R/R | when ACC starts | 4.11 | 3.95 | 4.00 | R/E | when LPIS starts | 0.88 | 0.83 | 0.83 | E/E |
| RTA: subcooled blowdown | |
| TSE | Upper plenum in sat conditions | s | 83 | 100 | 110 | R/R | IPA | Break flow up to 100 s | kg | 152 | 161 | 162 | R/R |
| RTA: first dryout occurrence | |
| TSE | Time of dryout | s | 2237 | 2299 | 2444 | E/R | Range of dryout occurrence at various core levels | s | 2237÷2471 | 2299÷2518 | 2444÷2625 | R/R |
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