ASME BPVC Section III, Division 1, Subsection NCD: Rules for Class 2 and Class 3 Components, 2023

ASME BPVC 2023 Section III, Division 1, Subsection NCD defines the mandatory requirements for the design, construction, inspection, and certification of Class 2 and Class 3 pressure-retaining components in nuclear power plants. Developed under ANSI-accredited consensus procedures, it ensures safety, integrity, and regulatory compliance in moderate- and low-risk nuclear systems.

Highlights:

• Material qualification and welding consumable certification
• Design-by-analysis criteria for vessels, piping, valves, and pump components
• Standards for fabrication, brazing, mechanical joints, and heat treatment
• Nondestructive examination (NDE) techniques and personnel qualifications
• Hydrostatic and pneumatic testing protocols
• Relief device and overpressure protection certification
• ASME marking, stamping, and documentation requirements

Key 2023 Revisions:

• Advanced manufacturing: NCD-2121(a) supports unlisted product forms per Appendix XXVIII
• Testing modernization: NCD-2321.2 removes full-size specimen mandate, aligns with SA-370
• Inservice monitoring: NCD-3124 permits use of Section XI Division 2 RIM programs
• Expanded NDE pathways: NCD-5540 includes CP-189 alongside SNT-TC-1A for personnel qualifications

Who It’s For:
Nuclear engineers, QA/QC professionals, code inspectors, and manufacturers engaged in Class 2 and Class 3 component compliance under ASME Section III.

BPVC.III.1.NCD-2023