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Title:
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Methodology for integrity assessment of irradiated components with flaws
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Author(s):
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Published by:
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Publication date:
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ECN
NUCLEAIR
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1997
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ECN report number:
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Document type:
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ECN-I--97-038
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Other
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Number of pages:
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Full text:
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37
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Download PDF
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Abstract:
A methodology for the structural integrity assessment of irradiatedflawed components is provided. The disciplines required for the assessment
are fracture mechanics, applied mechanics, materials research, and
experimental and analytical neutron metrology. A description of the
disciplines is given including the input information and resulting output
data of each discipline. The deterministic assessment procedure for fracture
initiation is based on the LEFM (Linear Elastic Fracture Mechanics) K-concept
(K is the stress intensity factor) and the EPFM (Elastic Plastic Fracture
Mechanics) J-integral concept (J is the parameter to characterize the
singular stress and strain fields around the crack tip in case of yielding)
resulting for instance in a failure assessment diagram. The uncertainties in
the material data, loading conditions, and neutron metrology results can be
addressed by performing a probabilistic analysis. This approach enables to
perform a sensitivity and uncertainty analysis. The fracture assessment
methodology described in the report can be elaborated, detailed, and
validated by performing a case study on flawed irradiated component material,
preferably from a real structure component which has operated in a nuclear
environment. 11 figs., 14 refs.
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