I would like to ask what exactly grade 2 and grade 3 components refer to in ASME materials. I’ve been searching for an hour but haven’t been able to find any information; anyone who is familiar with this topic could please help.
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As shown in the figure, the allowable stress values in Section D include classifications based on component grades; I searched in Volume I but could not find an explanation of what these classifications specifically refer to.
Volume 3 contains the design standards for nuclear power plants. Class 1 components in nuclear power plants are mainly those related to the primary circuit, while Class 2 and Class 3 components are non-core components located between the pressure-containing structures; the material requirements for these components are less stringent than those for Class 1 components. I’m not entirely sure of the details, but you can check Volume 3: NB corresponds to Class 1 components, NC to Class 2 components, and ND to Class 3 components
Thank you. I haven’t worked on nuclear power before; what I actually want to know is the content corresponding to one volume.