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:
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 fastener materials are included in Regulatory Guides 1.84 and 1.85, respectively. DRAFT Rev. 0 - April 1996 3.13-12 e. Design practices should include consideration of information and recommendations in EPRI NP-5769, Volumes 1 and 2, as endorsed by Generic Letter 91-17 and NUREG-1339. Where the potential for degradation of threaded fasteners from borated water corrosion and/or stress-corrosion cracking exists, such degradation should be addressed in the design and minimized to the extent practical. f. For those bolting applications subject to boric acid corrosion, an alloy resistant to boric acid and/or lithium hydroxide should be used. Alternatively, compatible coatings may be used on noncorrosion-resistant fasteners. An allowance for estimated loss of material due to corrosion may be incorporated in the design. g. General guidance on the design of bolted mechanical (as opposed to structural) fasteners and joints may be found in standard textbooks such as Bickford (Ref. 29); EPRI NP-6316, "Guidelines for Threaded Fastener Applications"; and Volumes 1, 11, and 13 of the ASM Metals Handbook. h. A matrix of bolting materials commonly used in nuclear power plants is contained in EPRI NP-6316. i. Laboratory stress-corrosion tests and service experience indicate that cold- worked austenitic stainless steels used in the RCPB should be limited to materials with a yield strength of less than or equal to 621 MPa (90,000 psi). 3. Maintenance requirements should include the following: a. Inspection and testing should comply with Section XI, subsection IWB, of the ASME Code. The Code Cases listed in Regulatory Guide 1.147 provide additional guidance or alternatives acceptable to the staff. b. The applicant should have systems and procedures to detect and correct leaks in the RCPB