Semi-supervised learning approach for crack detection and identification in advanced gas-cooled reactor graphite bricks
Berry, Craig and West, Graeme and McArthur, Stephen and Rudge, Anna (2017) Semi-supervised learning approach for crack detection and identification in advanced gas-cooled reactor graphite bricks. In: 10th International Topical Meeting on Nuclear Plant Instrumentation, Control, and Human-Machine Interface Technologies, NPIC and HMIT 2017, 2017-06-11 - 2017-06-15, Hyatt Regency.
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Abstract
One of the life-limiting components of an Advanced Gas cooled Reactor (AGR) is its graphite core. The bricks present in the core undergo radiolytic oxidation throughout their lifetime which causes graphite weight loss and irradiation which can result in some of the bricks developing cracks. Understanding the nature and extent of brick cracking within the core is key to ensuring continued and extended operation of the AGR fleet. A semi-supervised machine learning classification algorithm is proposed as a method for improving the detection of cracked graphite bricks, by combining the labels derived from infrequent, detailed inspections of the core, with unlabeled, more frequent monitoring measurements taken during refueling operations. Semi-supervised machine learning, which is an emerging field in nuclear power condition monitoring, is the combination of ideas from both supervised and unsupervised machine learning whereby the data that is used to train the algorithm is a combination of labeled and unlabeled data. This paper introduces the initial research that has been undertaken in creating a semi-supervised self-training algorithm to detect the presence of graphite brick cracks and then proceeds to show that there is an improvement in the classification of graphite bricks using a semi-supervised machine learning classifier compared to supervised machine learning classifiers. This improved classification performance is encouraging as it does not require time consuming and costly human analysis to obtain extra learning information from available data.
ORCID iDs
Berry, Craig ORCID: https://orcid.org/0000-0002-6824-0268, West, Graeme ORCID: https://orcid.org/0000-0003-0884-6070, McArthur, Stephen ORCID: https://orcid.org/0000-0003-1312-8874 and Rudge, Anna;-
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Item type: Conference or Workshop Item(Paper) ID code: 60561 Dates: DateEvent11 June 2017Published4 April 2017Accepted3 March 2017SubmittedSubjects: Technology > Electrical engineering. Electronics Nuclear engineering Department: Faculty of Engineering > Electronic and Electrical Engineering
Strategic Research Themes > EnergyDepositing user: Pure Administrator Date deposited: 28 Apr 2017 14:10 Last modified: 12 Sep 2024 00:26 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/60561