Document: NUREG-0800
Document ID: 62e8a2f9-b438-4ced-8623-3e61ee216490
Document Type: srp
Title: series.22
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070293.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8
CFR Part: 
CFR Title: 

Content:
Thermal Insulation a. Reflective metal insulation is acceptable if the insulation material is compatible with both the fastener and the base material. b. Nonmetallic insulation that complies with the criteria specified in Regulatory Guide 1.36, "Nonmetallic Thermal Insulation For Austenitic Stainless Steels," is acceptable. Requalification is not required when the ion concentrations described in Regulatory Guide 1.36, position C.3.b, deviate beyond the acceptable range on the low (conservative) side. c. Preloading procedures should provide for establishing and maintaining acceptable values in areas of limited access.27 B. Acceptance criteria for threaded fastener applications in the RCPB and RCS for areas of review described in subsection I.C include the following: 1. The general requirements for systems and components containing such fasteners are described in 10 CFR 50.55a; 10 CFR 50.60; and General Design Criteria 1, 2, 4, 14, 15, 30, 31, and 32, as outlined in subsection I.B. Threaded fasteners in the RCPB and RCS are part of Quality Group A components, as described in Regulatory Guide 1.26, and thus must meet the specific requirements for ASME Code Class 1 components. 2. Design requirements (including material selection and assurance of material compatibility) should include the following: a. Threaded fastener and connection design should meet the requirements of ASME Code Section III, Subsection NB, and Appendix E. (Application of specific subsections and appendices of the ASME Code is summarized in EPRI NP-5769, Volume 2, Chapter 9.) b. Bolting and fastener materials specified in paragraph I.C of Appendix G to 10 CFR Part 50 should meet the fracture toughness requirements of Appendix G as a supplement to the ASME Code requirements for fracture toughness. c. Regulatory Guide 1.65 provides material specifications for reactor vessel closure studs. (Refer to SRP Section 5.3.1.) d. Acceptable ASME Code Cases describing subjects related to fastener design and