Document: NUREG-0800
Document ID: 2c1e60ee-a3b4-4f26-8ebd-56dc7a8435b6
Document Type: srp
Title: THREADED FASTENERS ! ASME CODE CLASS 1, 2, AND
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550058.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.13
CFR Part: 
CFR Title: 

Content:
imize the probability that SCC will occur in components that are fabricated from either austenitic stainless steel or nickel-based alloys. Additional information summarizing the initiatives of the NRC staff and the industry to address bolting degradation and failure issues in the United States can be found in References 4 through 9. C. Fracture Toughness Requirements for Ferritic Materials The reviewer should ensure that the fracture toughness properties of ferritic bolts, studs, and nuts (i.e., made from either low-alloy steel or carbon steel materials) will be attained in accordance with the ASME Code, Section III criteria for threaded fasteners used in ASME Code Class 1, 2, and 3 systems. Class 1 Applications: The reviewer should verify that ferritic bolts, studs, and nuts (i.e., bolts, studs, and nuts made from either low-alloy steel or carbon steel materials) used in RCPB applications meet the fracture toughness requirements of 10 CFR Part 50, Appendix G. Section IV.A of Appendix G requires (in part) that the fracture toughness values for these materials comply with the fracture toughness criteria for ferritic materials that are specified in Subarticle NB of ASME Code Section III (refer to column 2 of Table 3.13-1). 3.13-11 March 2007 Class 2 and 3 applications: The fracture toughness requirements that are specified in 10 CFR Part 50, Appendix G, do not apply to ferritic bolts and studs used in Class 2 or 3 applications. However, since 10 CFR 50.55a invokes fracture toughness requirements in ASME Code, Section III, Subarticles NC and ND for ferritic bolting used in Class 2 and 3 applications, the reviewer should ensure that applicant specifies the appropriate Section III criteria (refer to columns 3 and 4 of Table 3.13-1). D. Fabrication Inspection The reviewer should verify that the applicant has specified the appropriate ASME Code, Section III examination criteria for threaded fasteners used in ASME Code Class 1, 2, and 3 systems. Table 3.13-1 identifies the