Analysis and compare each important defect assessing criterion or guidance, include ASME IIW PD6493 JWES R/H R6, and bring forward the reliability-assessing methods.

• 分析和比较包括ASME第三卷、IIW、PD6493、JWES、R/H R6等各国制定的缺陷评定规范或指南，指出了以上规范的局限性，提出以可靠性的观点进行缺陷评定。