Based on ASME Boilers and Pressure Vessels Code the major fracture mechanic analysis is limited to protection of class 1 components to brittle fracture.

All the Operators of future plants have to enlarge the scope of these analyses to different concepts, at design or operation stage:

- brittle and ductile analysis of hypothetical large flaw

- leak before break approach

- break exclusion concept

- incredibility of failure of high integrity components

- end of fabrication acceptable defect

- in-service inspection performance

- acceptable standards in operation

- Long Term Operation (LTO)

All these requirements needs a procedure, an analysis method with material properties and criteria.

After a short overview of each topic, the paper will present how RCC-M, RSE-M French Codes and ASME III and XI take care of all these new modern regulatory requirements.

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