Sensitivity and uncertainty analysis of the benchmark criticality experiments - 5-06

A calculation system based on the first order perturbation theory was established to evaluate sensitivity and uncertainty related to neutron multiplication factors (k_effS) of nuclear systems. Uncertainty assessments for critical experiments of homogeneous and heterogeneous cores were conducted in part of a series of experiments in the Static Experiment Critical Facility (STACY). The assessment results showed uncertainties of around 0.6% in k_effS. It was much larger than those concerning material and geometrical parameters of the core, and other causes. In addition, integrated sensitivity and uncertainty analysis based on a modular code system SCALE6.0 showed some differences from the calculated results of the present calculation system. Some discussions on the differences were given. (authors)