Document: NRC Regulatory Guide
Document ID: 44b58049-ac63-457b-a075-ef162b34cb70
Document Type: regulatory_guide
Title: Materials code case Acceptability - - ASME Section III, Division 1 (Rev. 31)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0037/ML003740365.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.85
CFR Part: 
CFR Title: 

Content:
A. INTRODUCTION Section 50.55a, "Codes and Standards," of 10 CFR Part 50, "Domestic Licensing of Production and Uti lization Facilities," requires, in part, that components of the reactor coolant pressure boundary be designed, fabricated, erected, and tested in accordance with the requirements for Class 1 components of Section III, "Nuclear Power Plant Components,"' of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code or equivalent quality standards. Footnote 6 to 10 CFR 50.55a states that the use of spe cific Code Cases may be authorized by the Commission upon request pursuant to 10 CFR 50.55a(a)(3), which requires that proposed alternatives to the described re quirements or portions thereof provide an acceptable level of quality and safety. General Design Criterion 1, "Quality Standards and Records," of Appendix A, "General Design Crite ria for Nuclear Power Plants," to 10 CFR Part 50 re quires, in part, that structures, systems, and compo nents important to safety be designed, fabricated, erected, and tested to quality standards commensurate with the importance of the safety function to be per 1Copies may be obtained from theAmerican Society of Mechanical Engi neers, Three Park Avenue, New York, New York 10016-5990. Phone (212)591-8500; fax (212)591-8501. Revision 31 May 1999 3UIDE formed. Where generally recognized codes and stan dards are used, Criterion 1 requires that they be identi fied and evaluated to determine their applicability, adequacy, and sufficiency and be supplemented or modified as necessary to ensure a quality product in keeping with the required safety function. Criterion 30, "Quality of Reactor Coolant Pressure Boundary," of the same appendix requires, in part, that components that are part of the reactor coolant pressure boundary be designed, fabricated, erected, and tested to the highest quality standards practical. Appendix B, "Quality Assurance Criteria for Nu clear Power Plants and Fuel Reprocessing