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:
called "small products exclusion," which exempts bolting material (including studs, nuts, and bolts) from certain QA provisions. It should be noted that threaded fasteners must meet the remaining Code provisions, as well as all applicable staff requirements. e. The design requirements for threaded fasteners including the determination of acceptability of fastener threads is specified in ASME Section III, Table NB-3131-1. Table NB-3132-1 references ASME Standard B1.1 for determining thread acceptability and ASME Standard B1.1 permits the use of System 21 (GO/NO GO gages), System 22 (variable indicating gages), or more complex systems to determine thread acceptability. ASME Standard B18.3 is also referenced in ASME Code, Section III, Table NB-3132-1, and ASME Standard B18.3 requires the use of System 22 for determining thread acceptability. However, the ASME Code, Section III refers to ASME Section II where the fastener standards state that ASME Standard B18.3 is to be used for dimensions other than for the threads and that ASME Standard B1.1 is to be used for determining acceptability of the threads. Hence, procurement documents for fasteners may state that thread acceptability is to be determined using System 21, System 22, or more complicated methods and there are no requirements to use only System 22 in the nuclear industry.26 3. Failure Analysis a. Root cause analysis of threaded fastener or joint degradation and failure should be based on formal procedures and training. 3.13-11 DRAFT Rev. 0 - April 1996 b. The applicant's programs and procedures should address threaded fastener problems identified by the staff and by industry, including those described in Generic Letter 91-17, NUREG-0943, and NUREG-1339. 4. Compatibility of Austenitic Stainless Steel Fasteners with 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