Uncertainty assessment on the calculated decay heat of the ASTRID basic design core based on the DARWIN-2.3 package

The resulting 1σ uncertainty on the decay heat calculation never exceeds 2.6%, which shows a major improvement compared to the previous uncertainty evaluation that could reach 6.6%. Additional sources of uncertainties will have to be considered in the future in order to evaluate the full uncertainty on decay heat calculations: the reactor operation conditions variations, the accuracy of the nominal power measurement and the uncertainty on the neutron flux calculated with the new APOLLO3® code system, which will be dedicated to the ASTRID neutronic calculations.