Exploratory analysis to estimate axial fracture toughness for ZR-2.5NB pressure tubes using test data from small curved compact specimens

Steven X. Xu, Kim Wallin

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    1 Citation (Scopus)

    Abstract

    Zr-2.5Nb pressure tubes are in-core, primary coolant containment of CANDU(1) nuclear reactors. Technical requirements for in-service evaluation of pressure tubes are provided in the Canadian Standards Associate (CSA) N285.8. These requirements include the evaluation of service conditions for protection against fracture of operating pressure tubes and demonstration of leakbefore-break. Axial fracture toughness for pressure tubes is a key input in the evaluation of fracture protection and leak-before-break. The 2015 Edition of CSA N285.8 provides a pressure tube axial fracture toughness prediction model that is applicable to pressure tubes late life conditions. The fracture toughness prediction model in CSA N285.8-15 is based on rising pressure burst tests performed on pressure tube sections with axial cracks under simulated pressure tube late life conditions. Due to the associated high cost of testing and high consumption of pressure tube material, it is not practical to perform a large number of fracture toughness burst tests. On the other hand, more fracture toughness data is required to improve the existing pressure tube axial fracture toughness prediction model. There is strong motivation to estimate pressure tube axial fracture toughness using test data from small specimens. The estimated pressure tube fracture toughness using test data from small specimens can fill the gaps in the burst test toughness data, as well as provide information on material variability and data scatter. Against this background, an exploratory analysis of estimating pressure tube axial fracture toughness using test data from small curved compact specimens has been performed and is described in this paper. The estimated values of pressure tube axial fracture toughness using the test data from small curved compact specimens are compared with the measured toughness from burst tests of pressure tube sections with axial cracks to check the feasibility of this approach.

    Original languageEnglish
    Title of host publicationCodes and Standards
    PublisherAmerican Society of Mechanical Engineers ASME
    Volume1A-2017
    ISBN (Electronic)9780791857908
    DOIs
    Publication statusPublished - 1 Jan 2017
    MoE publication typeA4 Article in a conference publication
    EventASME 2017 Pressure Vessels and Piping Conference, PVP 2017 - Waikoloa, United States
    Duration: 16 Jul 201720 Jul 2017

    Conference

    ConferenceASME 2017 Pressure Vessels and Piping Conference, PVP 2017
    CountryUnited States
    CityWaikoloa
    Period16/07/1720/07/17

    Fingerprint

    Fracture toughness
    Toughness
    Cracks
    Nuclear reactors
    Coolants
    Demonstrations

    Cite this

    Xu, S. X., & Wallin, K. (2017). Exploratory analysis to estimate axial fracture toughness for ZR-2.5NB pressure tubes using test data from small curved compact specimens. In Codes and Standards (Vol. 1A-2017). American Society of Mechanical Engineers ASME. https://doi.org/10.1115/PVP2017-66116
    Xu, Steven X. ; Wallin, Kim. / Exploratory analysis to estimate axial fracture toughness for ZR-2.5NB pressure tubes using test data from small curved compact specimens. Codes and Standards. Vol. 1A-2017 American Society of Mechanical Engineers ASME, 2017.
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    abstract = "Zr-2.5Nb pressure tubes are in-core, primary coolant containment of CANDU(1) nuclear reactors. Technical requirements for in-service evaluation of pressure tubes are provided in the Canadian Standards Associate (CSA) N285.8. These requirements include the evaluation of service conditions for protection against fracture of operating pressure tubes and demonstration of leakbefore-break. Axial fracture toughness for pressure tubes is a key input in the evaluation of fracture protection and leak-before-break. The 2015 Edition of CSA N285.8 provides a pressure tube axial fracture toughness prediction model that is applicable to pressure tubes late life conditions. The fracture toughness prediction model in CSA N285.8-15 is based on rising pressure burst tests performed on pressure tube sections with axial cracks under simulated pressure tube late life conditions. Due to the associated high cost of testing and high consumption of pressure tube material, it is not practical to perform a large number of fracture toughness burst tests. On the other hand, more fracture toughness data is required to improve the existing pressure tube axial fracture toughness prediction model. There is strong motivation to estimate pressure tube axial fracture toughness using test data from small specimens. The estimated pressure tube fracture toughness using test data from small specimens can fill the gaps in the burst test toughness data, as well as provide information on material variability and data scatter. Against this background, an exploratory analysis of estimating pressure tube axial fracture toughness using test data from small curved compact specimens has been performed and is described in this paper. The estimated values of pressure tube axial fracture toughness using the test data from small curved compact specimens are compared with the measured toughness from burst tests of pressure tube sections with axial cracks to check the feasibility of this approach.",
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    Xu, SX & Wallin, K 2017, Exploratory analysis to estimate axial fracture toughness for ZR-2.5NB pressure tubes using test data from small curved compact specimens. in Codes and Standards. vol. 1A-2017, American Society of Mechanical Engineers ASME, ASME 2017 Pressure Vessels and Piping Conference, PVP 2017, Waikoloa, United States, 16/07/17. https://doi.org/10.1115/PVP2017-66116

    Exploratory analysis to estimate axial fracture toughness for ZR-2.5NB pressure tubes using test data from small curved compact specimens. / Xu, Steven X.; Wallin, Kim.

    Codes and Standards. Vol. 1A-2017 American Society of Mechanical Engineers ASME, 2017.

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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