Solartron Impection Of Technology In The BEC System

The current EC system used for graphite conductivity profiling and sub-surface crack detection is based on a commercial instrument known as Solartron Impedance Analyser. This system can only take a single frequency measurement at a time, since the current methods is based on a multi-frequency measurement this take a long time to acquire a full set of multi-frequency measurements required for conductivity reconstruction and crack detection. From a practical point of view, a slow measurement system is also associated with an increased cost as this could increase the overall inspection time of the reactor core. Therefore, the future work in this area could be an investigation of suitable system that allow a measurement of the multi-frequency†¦show more content†¦The suitability of the monotonic constraining technique for the reconstruction of the brick conductivity profile of the HPB reactors was proved through the comparison of the reconstructed profiles against the trepanned sample measurements and the PECIT predictions. The general assumptions for the AGR brick radial density/conductivity variations are normally an increasing trend, which has semi-quadratic features between the graphite bore and periphery, hence the monotonic constraining technique is expected to work reasonably well. However, due to the variability in the graphite manufacturing process some of the graphite bricks in the AGR may already contain some density variations (prior to irradiation) throughout their radial thickness that could possibly result in non-monotone density/ conductivity trend between the graphite bore and periphery. Therefore, this assumption is not always guaranteed. Our industrial partners have indicated that there may be limited cases were the density profile (and hence the conductivity profile) may show a non-monotonic curve. For this reasons the monotonic constraining technique may not be suitable for those limited cases. A future work in this area could be buil ding a database from the historic resistivity data, and using this database as a