Data mining reactor fuel grab load trace data to support nuclear core condition monitoring

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A critical component of an advanced-gas cooled reactor (AGR) station is the graphite core. As a station ages, the graphite bricks that comprise the core can distort and may eventually crack. As the core cannot be replaced the core integrity ultimately determines the station life. Monitoring these distortions is usually restricted to the routine outages, which occur every few years, as this is the only time that the reactor core can be accessed by external sensing equipment. However, during weekly refueling activities measurements are taken from the core for protection and control purposes. It is shown in this paper that these measurements may be interpreted for condition monitoring purposes, thus potentially providing information relating to core condition on a more frequent basis. This paper describes the data-mining approach adopted to analyze this data and also describes a software system designed and implemented to support this process. The use of this software to develop a model of expected behavior based on historical data, which may highlight events containing unusual features possibly indicative of brick cracking, is also described. Finally, the implementation of this newly acquired understanding in an automated analysis system is described.
Original languageEnglish
Pages (from-to)1494-1503
Number of pages10
JournalIEEE Transactions on Nuclear Science
Issue number3
Publication statusPublished - Jun 2006


  • condition monitoring
  • data analysis
  • data mining
  • distortion measurement
  • fission reactors
  • fuels
  • inductors
  • information resources
  • nuclear power generation
  • programmable control

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  • Impacts

    Improved monitoring of graphite cores supports the safety case for life extension of nuclear power stations

    Graeme West (Participant) & Stephen McArthur (Participant)

    Impact: Impact - for External PortalQuality of life and safety, Professional practice, training and standards, Environment and sustainability - natural world and built environment


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