ASME BPVC Section III, Division 1, Subsection NB: Rules for Class 1 Nuclear Facility Components, 2023

ASME BPVC Section III, Division 1, Subsection NB provides mandatory construction rules for Class 1 pressure-retaining components in nuclear power facilities. Recognized globally, this standard defines the technical and quality requirements essential for safe and compliant performance in high-integrity nuclear environments.

Highlights:

• Material qualification and certification, including welding consumable selection
• Design-by-analysis and allowable stress design criteria
• Requirements for vessels, piping, valves, and pump components
• Fabrication processes including mechanical joints, welding, and heat treatment
• Nondestructive examination (NDE) methods and acceptance criteria
• Protocols for hydrostatic, pneumatic, and special pressure testing
• Overpressure protection and relief system certification standards
• Stamping, marking, and documentation rules for code compliance

New in the 2023 Edition:

• Enhanced fracture toughness requirements
• Updated material specifications and qualification rules
• Clarified guidance on fabrication, examination, and inspection procedures

Who It’s For:
Nuclear engineers, QA/QC inspectors, fabricators, and regulatory compliance personnel involved in the design, manufacture, and validation of ASME Section III Class 1 components.

BPVC.III.1.NB-2023