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
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will select material from the procedures described below, as may be appropriate for a particular case. These review procedures are based on the identified SRP acceptance criteria. For deviations from these acceptance criteria, the staff should review the applicant’s evaluation of how the proposed alternatives provide an acceptable method of complying with the relevant NRC requirements identified in Subsection II. 3.13-9 March 2007 1. Design Aspects A. Materials Selection ASME Code, Section III provides acceptable standards for selecting threaded fastener materials identified in Section II of the ASME Code. Section II provided the material properties for threaded fasteners used in mechanical joints for ASME Code, Class 1, 2 and 3 applications. Table 3.13-1 lists the applicable criteria in ASME Code, Section III that pertain to the material selection for threaded fasteners in Class 1, 2, and 3 systems. In accordance with NB-2128, the use of washers is optional. If washers are used, they should be fabricated from wrought materials with mechanical properties that are compatible with the associated nuts. Class 1 Applications: ASME Code, Section III, Paragraphs NCA-1220 and NB-2128, provide the material selection criteria for threaded fasteners used in Class 1 applications. Paragraph NB-2128 provides that materials for Class 1 bolts and studs should conform to one of the specifications listed in Table 4 of ASME Section II, Part D, Subpart 1. The materials for nuts should conform to either SA-194 or to one of the specifications listed in Table 4 of ASME Code, Section II, Part D, Subpart 1. The applicant should, prior to determining the acceptability of proposed alternatives to the materials permitted in Table 4 of Subpart 1, perform a study of the suitability of the alternative materials selected for the threaded fasteners and compare with any precedents set forth and accepted in prior staff reviews. The reviewer should provide a rationale for accepting or rejecting any