Experimental reactor noise - a review on noise-analytic measurements of thermohydraulic parameters in operating BWRs and their interpretations

This article reviews the results and interpretations of measurements inferred from neutron-noise in BWRs with respect to their applicability for Code-Verification, Monitoring and Anomaly-Detection, which are the final goals of neutron-noise investigations in BWRs. It will be shown that for the time-being, none of these goals have been reached and furthermore, in the near future, rigorous code-verification by means of neutron-noise in operating BWRs (measurements of fluid velocity and void-fraction as well as flow-pattern identification), due to the complexity of the system (the measured values are unknown types of averages of the flows in four 8 x 8 bundles) seems to be rather difficult. (author)