Spatial power profiling method using visual information in reactors with optically transparent coolants

The purpose of this study is to develop a method of power profile reconstruction based on visual instrumentation in nuclear reactors with optically transparent coolants. The detection of visible light produced by Cerenkov radiation at points outside of the active core region of a TRIGA reactor is correlated to the spatial power profile within the reactor core using a response function. A detailed MCNP model of the core is used to tally electron fluxes within coolant channels, which then use the response function to produce a 2D map of the Cerenkov radiation above the core. The potential use for this method is demonstrated by modelling various reactor perturbations at constant core power and showing the ability of the method to provide information about what change occurred. Some analysis of the applicability of this method to different reactor designs is performed, with recommendations as to where and how it could be implemented. (C) 2019 Elsevier Ltd. All rights reserved.