Open Access
Table 6
Main model parameters uncertainties (1/2) − truncated normal law at ±3σ (neutronic best estimate data issued from the ERANOS tool [37] and thermo mechanical (TM) data issued from GERMINALGERMINAL tool [38]).
| Modeled variable | Uncertainty range at ±2σ | Nominal value | Derivation (σ) | Inf limit (−3σ) | Sup limit (+3σ) |
|---|---|---|---|---|---|
| Neutronic feedback due to fuel axial thermal expansion | ±25% | List of neutronic data* | 12.5 | −37.5 | 37.5 |
| Doppler neutronic feedback | ±15% | List of neutronic data* | 7.5 | −22.5 | 22.5 |
| Sodium void/density neutronic feedback | ±20% | List of neutronic data* | 10 | −30 | 30 |
| Pellet/clad heat transfer coefficient | ±20% | List of TM data* | 10 | −30 | 30 |
| Clad conductivity | ±5% | 19.52 (W/m/°C) | 0.50 | 18.02 | 21.02 |
| Singular head loss at the bottom of each sub-assembly | ±10% | Depending on flow rate | 5 | −15 | 15 |
| Singular head loss at the bottom of storage sub-assembly | ±10% | 8648 | 5 | −15 | 15 |
| Singular head loss at the bottom of sub-assembly in debugging positions | ±10% | 3095 | 5 | −15 | 15 |
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