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Table 4.

keff uncertainties obtained for the MISTRAL-1 core at 294 and 354 K due to the model parameter uncertainties reported in Table 2. This uncertainty indicator expressed in pcm/K represents a calculation bias on keff relatively to the effective temperature uncertainty. The digits in parentheses come from the statistical uncertainty due to the Monte-Carlo calculations.

Test Thermal 294 K
354 K
case Scattering laws Δkeff calculation bias Δkeff calculation bias
i = 1 H2O ±50 (6) pcm ±2.5 pcm/K ±56 (3) pcm ±2.9 pcm/K
i = 2 UO2 ±27 (3) pcm ±2.7 pcm/K ±12 (3) pcm ±1.2 pcm/K

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