This work is part of the European project CORTEX: Core Monitoring Techniques & Experimental, and Validation and Demonstration for Improved Safety. The strategic objectives are: To develop simulation tools to model the stationary fluctuations effect in power reactors with a high level of fidelity. Validation of the simulation tools using reactor experiments specifically designed for neutron noise analysis applications. To develop machine learning methodologies for recovering the anomaly responsible for the observed fluctuations. To combine the modelling capabilities and the signal analysis techniques into tools that can be directly used for core diagnostics.