クラス1機器異材継手及び配管耐圧部溶接継手における体積試験範囲適正化の検討

概要

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Volumetric examination range is defined to cover the wall thickness for welds of category B-F and B-J in current JSME Fitness-for-Service (FFS) Code. Since it was not reasonable for examiners to have higher radiation dose due to meaningless data such as configuration echoes, a rule change of the volumetric examination range to 1/3 thickness of inner surface side from the whole thickness was proposed. By this modification in the examination range, advanced inspection techniques such as phased-array ultrasonic test would be applicable. Through the survery of various report, it was shown that the welds of these categories had not been suffered from any trouble which initiated from embedded flaw. Furthermore, the validity of the modification was also confirmed by showing the allowable flaw size for plant fabrication was smaller than that of the JSME FFS Code. Namely, any serious flaw is not initiated from inside the body during the plant operation, or, even if a flaw exists in plant fabrication, the size of the flaw is small enough from view point of the integrity assessment.
社団法人日本機械学会の論文
2009-02-25