Chapter 8
Subsection NB, NC, ND-3600 Piping


Chapter 8, authored by Donald Landers, discusses Section III, Division 1 (Piping). Chapter 7 indicates that the requirements of Section III, Division 1 provide for three classes of components. Chapter 8 indicates that each Class can be considered a quality level, with Class 1 the highest and Class 3 the lowest. These quality levels exist because of the various requirements for each Class in Section III related to materials, fabrication, installation, examination, and design. Design was placed last on the list because sufficient evidence exists to indicate that the other considerations listed are more important than (or, at best, equal to) the design requirements.

In Chapter 8, Donald mentions the foregoing list in his discussions leading to the Code requirements and his commentary regarding the criteria and basis for requirements of Subsections NB, NC and ND Piping. He provides the stress requirements for Nuclear Classes 1, 2, and 3 Piping and the corresponding design processes and Design Specifications, with pertinent references, tables, and figures. His commentary provides insight into load classifications and the responsibility of Owners. The Code rules ensure that violation of the pressure boundary will not occur if the Design Specification satisfactorily addresses all issues necessary for Code compliance. In his commentary, Donald shows the subtle differences between the piping rules and design by analysis, and he explains what items the analyst should be concerned with in satisfying Code requirements. He provides cross-references to B31.7 Code techniques and discusses the current controversy regarding seismic requirements in the piping rules in Section III, Division 1, along with the anticipated revisions that will resolve the controversy.

  • 8.1 Background
  • 8.2 Nuclear Class 1, NB-3600
  • 8.3 Nuclear Class 2 and 3 NC/ND-3600
  • 8.4 Design Process
  • 8.5 Design Specification Discussion
  • 8.6 References

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