Research Article
Validation of Advanced Computer Codes for VVER Technology: LB-LOCA Transient in PSB-VVER Facility
Table 2
Information on nodalizations and the code options.
| Number | Quantity | Unit | EDO-GP pretest KORSAR | EDO-GP posttest KORSAR | EDO-GP pretest TECH-M | EDO-GP posttest TECH-M | NRI posttest ATHLET | UNIPI posttest R5-3D |
| 1 | Adopted code resources |
| 1.1 | Tot. no. of hydraulic components primary system | — | — | — | — | — | 142 | 482 | 1.2 | Tot. no. of hydraulic components | — | 185 | 193 | — | — | 164 | 620 | 1.3 | Tot. no. of hydraulic nodes (meshes) primary system | — | — | — | | | 693 | — | 1.4 | Tot. no. of hydraulic nodes (meshes) | — | 858 | 825 | | | 820 | 2474 | 1.5 | Tot. no. of heat structures | — | 52 | 65 | | | 90 | 2171 | 1.6 | Tot. no. of mesh points in the heat structures | — | 509 | 629 | 4 | 4 | 2108 | 11263 | 1.7 | Tot. no. of core active structures | — | 10 | 10 | 30 | 30 | 20 | 20 | 1.8 | Tot. no. of core radial meshes in the active structures | — | — | — | 7 | 7 | 3 | 13 |
| 2 | Nodalization features |
| 2.1 | No. of modeled loops | — | 4 | 4 | 4 | 4 | 4 | 4 | 2.2 | No. of horizontal tubes per SG | — | 4 | 4 | 1 | 1 | 5 | 17 | 2.3 | Core model (3D or 1D) | — | 1D | 1D | 1D | 1D | 1D | 1D | 2.4 | No. of hydraulic channels in core region | — | 1 | 1 | 3 | 3 | 2 | 2 | 2.5 | Cross-flow junctions between parallel channels in the core | — | Yes | Yes | No | No | No | Yes |
| 3 | Code options |
| 3.1 | Reflood model top-down | — | — | Yes | Yes | Yes | No | Yes | 3.2 | Reflood model bottom-up | — | — | Yes | Yes | Yes | No | Yes | 3.3 | CCFL model | — | — | No | Yes | Yes | Wallis | No |
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