Document: NUREG-0800
Document ID: 62485d6f-6b2a-4360-acb5-f874d2adc406
Document Type: srp
Title: PIPING SYSTEMS AND COMPONENTS - INSPECTIONS, TESTS,
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1808/ML18088A069.pdf
Revision Date: 2023-06
Chapter: 14
Section ID: 14.3.3
CFR Part: 
CFR Title: 

Content:
ety functions performed. Nuclear power plant components classified as part of the reactor coolant pressure boundary (hereafter referred to as Quality Group A), Quality Group B, and Quality Group C are required by 10 CFR 50.55a to meet the requirements for ASME BPV Code Class 1, 2, or 3, respectively; therefore, SSC safety classifications should be in each system's design description, and the functional drawings should identify the ASME BPV Code classification boundaries applicable to the safety class. The ASME BPV Code classes in ASME BPV Code, Section III, provide design requirements that assure structural integrity and quality commensurate with the relative importance assigned to the individual items of the nuclear power plant. The ASME BPV Code class requirements may be verified by either a generic piping design ITAAC or by each system ITAAC. The use of other codes and standards (e.g., American Institute of Steel Construction manual for building structural steel) is within the Tier 2 scope, and DCD Tier 2 describes the applicable codes and standards for these other safety-related SSCs not designed to the ASME BPV Code, Section III. Appendix B of 10 CFR Part 50 contains the quality assurance requirements for safety-related SSCs. B. Fabrication (Welding). 10 CFR Part 50, Appendix A, GDC 14, “Reactor Coolant Pressure Boundary,” requires that the reactor coolant pressure boundary be designed, fabricated, erected, and tested to have an extremely low probability of abnormal leakage, of rapidly propagating failure, and of gross rupture. In addition, GDC 30, “Quality of Reactor Coolant Pressure Boundary,” requires that component parts of the reactor coolant pressure boundary be designed, fabricated, erected, and tested to the highest quality standards practical. The ASME BPV Code class welds are included in Tier 1 because ASME BPV Code, Section III, is referenced in 10 CFR 50.55a, which requires nuclear power plant components classified as Quality Groups A, B,