Proceedings of the KSME Conference (대한기계학회:학술대회논문집)
- 2004.04a
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- Pages.324-329
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- 2004
A Study on Influences of Crack Morphology Variables
균열형상변수의 영향 고찰
- Published : 2004.04.28
Abstract
In this study, an application of crack morphology variables in the Leak-Before-Break(LBB) evaluation for nuclear piping systems is investigated, including influences on the leakage crack size and crack instability loads. The crack surface roughness and the number of flow turns as a function of the crack opening displacement are applied to LBB evaluations for KSNP pressurizer surge line, for which fatigue and stress corrosion cracking are considered as failure mechanisms. As a result, there would be a significant impact on safety margins to acceptance criteria for the surge line if crack morphology variables are applied additionally to the current regulatory guide without re-analyses for justification of safety factors being applied on the leakage crack size and piping loads for evaluations.
Keywords