Allowable flaws for Class 1 vessels and piping are defined in the Acceptance Standards of JSME (The Japan Society of Mechanical Engineers) Code on Fitness- for-Service (FFS). When detected flaws are subsurface flaws located near component surface, the subsurface flaws are transformed into surface flaws. This is a proximity rule of subsurface flaws. This paper describes the inconsistencies of the subsurface flaws in the Acceptance Standards of vessels and piping. Authors have developed method to improve the inconsistencies and compared it with the proximity rules of the ASME Code Section XI.
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