Document: NUREG-0800
Document ID: 7c7e043f-0cf6-4d85-ad06-3f01128bc7f8
Document Type: srp
Title: (ENiCrFe-7), and 5.14 (ERNiCrFe-7)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0703/ML070380192.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.11
CFR Part: 
CFR Title: 

Content:
region, if practical (given other design considerations such as the desired preload in the tube for once-through steam generators). The choice of the method for expansion should consider limiting the stresses in the tube. Limiting the crevices will restrict the buildup of corrosion product and sludge that can lead to corrosion. Limiting the stresses will diminish the potential for stress-corrosion cracking. D. Includes an appropriate allowance for deterioration (including corrosion) of the steam generator materials. This is accomplished through compliance with Section III of the ASME Code (Articles NB-2160 and NB-3121 for Class 1 components and Articles NC-2160 and NC-3121 for Class 2 components). E. Uses bolting material that will perform adequately under the expected service conditions and that is not subject to stress-corrosion cracking. This can be accomplished by following the regulatory positions in Regulatory Guide 1.65. Although Regulatory Guide 1.65 provides guidance for the design of reactor vessel closure studs, it is also appropriate for the selection of suitable steam generator bolting material. The integrity of bolting and threaded fasteners is also reviewed under SRP Section 3.13. The above criteria, in conjunction with the acceptance criteria for interfacing reviews and appropriately performed inservice inspections, as discussed above, provide assurance that (1) the probability of abnormal leakage, rapidly propagating failure, and gross rupture will be extremely low, (2) the design conditions of the RCPB are not exceeded during operation, and (3) sufficient margin is available to prevent rapidly propagating failure, consistent with the requirements of GDC 14, 15, and 31. 3. Fabrication and Processing of Ferritic Materials A. Fracture Toughness The steam generator is part of the primary and secondary system pressure boundary. As a result, the materials selected should be sufficient to avoid rapidly propagating failure and to ensure that the design