Joint Neutron Noise Measurements on Metallic Reactor Caliban

The aim of the experiments concerning neutron noise measurements presented in this article is to provide robust experimental subcritical data. These measurements will make possible to compare measured parameters to simulated ones. The results of these measurements must therefore be very accurate, with controlled uncertainties. To determine the relative contribution of uncertainties to the final result, a table presents the prompt multiplication estimated by a French team and a U.S. team. The different sources of uncertainties are then explored, by a sensitivity analysis, separated in three categories, linked to the experimental configuration, to the detection process and finally to the analysis process. These experiments improve the safety task of reactivity control far from criticality, with static methods, and the knowledge of the behaviour of a subcritical reactor.