Allowable Subsurface Flaws Located Near Vessel Surface in JSME Code

Kunio Hasegawa; Hiroaki Tamako; Katsumasa Miyazaki

doi:10.4028/www.scientific.net/SSP.120.77

Paper Titles

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Recent Japanese Probabilistic Fracture Mechanics Researches Related to Failure Probability of Aged RPV
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Assessment of Steam Generator Tubes with Dual Axial Through-Wall Cracks
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Allowable Subsurface Flaws Located Near Vessel Surface in JSME Code
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Ductile Fracture Behaviour of Class 2 and 3 LWR Piping and Its Implications for Flaw Evaluation Criteria
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The Study of Fatigue Crack Growth of 304SS with the Influence of Loading Frequency and Temperature
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Enhancement of Flaw Detectability Using Time Reversal Techniques
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Allowable Subsurface Flaws Located Near Vessel Surface in JSME Code

Abstract:

JSME Code on Fitness-for Service for Nuclear Power Generation Facilities defines allowable subsurface flaws for Class 1 ferritic vessels in the Acceptance Standard. When detected subsurface flaws are located near vessel surface, the subsurface flaws are transformed to be surface flaws for assessment of acceptability in JSME Code. This paper describes inconsistency of the subsurface flaws transforming to surface flaws and introduces an improvement method for the subsurface flaws.