Sensitivity and Uncertainty Calculations in Support of the Noise Analysis of the TAPIRO Reactor

\nIn the framework of an assessment of the application of neutron noise methodologies to the TAPIRO reactor, sensitivity and uncertainty analyses on impacting nuclear data for this experimental reactor have been performed using the Serpent Monte Carlo code. Integral parameters relevant to the noise analysis of TAPIRO have been investigated, namely the effective multiplication factor, the effective delayed neutron fraction and the effective generation time. The nuclear data uncertainty has been assessed using different data libraries (ENDF/B-VIII.0 and JEFF-3.3), different energy grids (ECCO-33 and XMAS- 172) and different techniques (Generalised Perturbation Theory and Unscented Transform). A ranking of the most impacting nuclides and reactions in terms of uncertainties has been performed, pointing out that the impact of nuclear data uncertainties on the responses is non-negligible and must be taken into account also in the noise analysis of the reactor.\n