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Stress Intensity Factor solutions for through-clad and underclad defects in WWER reactor pressure vessel nozzles under pressurised thermal shock.

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Title: Stress Intensity Factor solutions for through-clad and underclad defects in WWER reactor pressure vessel nozzles under pressurised thermal shock.
Authors: Antonchenko, Vitalii1 antonchenko-vo@ipp-centre.com.ua, Dubyk, Yaroslav2 dubyk-yr@ipp-centre.com.ua, Iasnii, Volodymyr1 v_iasnii@tntu.edu.ua
Source: Fracture & Structural Integrity. Jul2026, Issue 77, p247-264. 18p.
Subjects: Stress intensity factors (Fracture mechanics), Metal cladding, Thermal shock, Fracture mechanics, Finite element method, Nuclear pressure vessels
Abstract: This study develops stress intensity factor (SIF) solutions for cladded WWER reactor pressure vessel nozzles subjected to pressurised thermal shock loading. Although finite element analysis is widely used for fracture assessment, analytical or semi-analytical SIF formulations remain important for fast evaluation, including online stress monitoring, probabilistic fracture mechanics, and screening of transient scenarios. The proposed approach combines an influence coefficient method based on threedimensional finite-element J-integral evaluation with least-squares refinement of shape coefficients. A stress decomposition procedure is applied to address the stress discontinuity at the ferritic base metal-austenitic cladding interface. The resulting coefficients are validated against finite element reference solutions for representative pressure and thermal loading cases and show good agreement over the investigated range of crack sizes and aspect ratios. The developed solutions provide a practical tool for engineering assessment of through-clad and underclad defects in cladded WWER nozzle regions. [ABSTRACT FROM AUTHOR]
Copyright of Fracture & Structural Integrity is the property of Gruppo Italiano Frattura and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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An: 194797686
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  Data: Stress Intensity Factor solutions for through-clad and underclad defects in WWER reactor pressure vessel nozzles under pressurised thermal shock.
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  Data: This study develops stress intensity factor (SIF) solutions for cladded WWER reactor pressure vessel nozzles subjected to pressurised thermal shock loading. Although finite element analysis is widely used for fracture assessment, analytical or semi-analytical SIF formulations remain important for fast evaluation, including online stress monitoring, probabilistic fracture mechanics, and screening of transient scenarios. The proposed approach combines an influence coefficient method based on threedimensional finite-element J-integral evaluation with least-squares refinement of shape coefficients. A stress decomposition procedure is applied to address the stress discontinuity at the ferritic base metal-austenitic cladding interface. The resulting coefficients are validated against finite element reference solutions for representative pressure and thermal loading cases and show good agreement over the investigated range of crack sizes and aspect ratios. The developed solutions provide a practical tool for engineering assessment of through-clad and underclad defects in cladded WWER nozzle regions. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Fracture & Structural Integrity is the property of Gruppo Italiano Frattura and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.3221/IGF-ESIS.77.15
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 18
        StartPage: 247
    Subjects:
      – SubjectFull: Stress intensity factors (Fracture mechanics)
        Type: general
      – SubjectFull: Metal cladding
        Type: general
      – SubjectFull: Thermal shock
        Type: general
      – SubjectFull: Fracture mechanics
        Type: general
      – SubjectFull: Finite element method
        Type: general
      – SubjectFull: Nuclear pressure vessels
        Type: general
    Titles:
      – TitleFull: Stress Intensity Factor solutions for through-clad and underclad defects in WWER reactor pressure vessel nozzles under pressurised thermal shock.
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            NameFull: Antonchenko, Vitalii
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            NameFull: Dubyk, Yaroslav
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            NameFull: Iasnii, Volodymyr
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          Dates:
            – D: 01
              M: 07
              Text: Jul2026
              Type: published
              Y: 2026
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              Value: 77
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            – TitleFull: Fracture & Structural Integrity
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