3-D reconstruction of AGR fuel channels using RVI footage

Kristofer Law, Graeme West, Paul Murray, Chris Lynch

Research output: Chapter in Book/Report/Conference proceedingConference contribution book


Within the U.K, there is a fleet of 7 Advanced Gas-cooled Reactor (AGR) stations in operation which are close to or have already exceeded their original estimated design lifetime. As the reactors continue to age, it is critical to gain an understanding of the structural morphology of the AGR fuel channels and to quantify changes in the physical properties of the graphite bricks which occur during reactor operation. To assess such operational changes, periodic Remote Visual Inspection (RVI) is carried out on pre-selected channels using specialist inspection tools which gather video and other sensory data of the channel bore. Current visualisation of the video provides limited 3-D structural information due to the image acquisition process which results in a loss of depth information. This paper describes a novel image reconstruction framework based on a technique called Structure-from-Motion (SfM) which has been designed to ascertain 3-D structural information directly from 2-D in-core RVI data. This paper also discusses the challenges of applying 3-D reconstruction techniques like SfM to pre-existing inspection data before demonstrating that the proposed framework can be applied to data captured under laboratory conditions and to subsets of real in-core inspection videos to generate singular and circumferential point cloud reconstructions of the channel bore.
Original languageEnglish
Title of host publication6th EdF-Energy Nuclear Graphite Conference (2018)
Number of pages10
Publication statusAccepted/In press - 1 Nov 2018
Event6th EDF Energy Nuclear Graphite Conference - kendal, United Kingdom
Duration: 15 Oct 201818 Oct 2018


Conference6th EDF Energy Nuclear Graphite Conference
Country/TerritoryUnited Kingdom


  • remote visual inspection
  • advanced gas-cooled reactor
  • structure-from-motion


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