Document: NUREG-0800
Document ID: 495c2b41-2832-4900-9000-040f3ae8c835
Document Type: srp
Title: STEAM GENERATOR MATERIALS AND DESIGN
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1614/ML16147A289.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.2.1
CFR Part: 
CFR Title: 

Content:
appropriately performed inservice inspections, as discussed above, provide assurance that (1) the design is compatible with environmental conditions during normal operating, testing, maintenance, and postulated accident conditions, (2) the probability of abnormal leakage, rapidly propagating failure, and gross rupture will be extremely low, (3) the design conditions of the RCPB are not exceeded during operation, and (4) sufficient 5.4.2.1-10 Revision 4 - July 2016 margin is available to prevent rapidly propagating failure, consistent with the requirements of GDC 4, 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 boundaries. As a result, the materials selected should be sufficient to avoid rapidly propagating failure and to ensure that the design conditions will not be exceeded during operation, consistent with the requirements of GDC 14, 15, and 31. The pressure-retaining ferritic materials selected for use in steam generators are acceptable from a fracture toughness standpoint if they (1) comply with Appendix G to 10 CFR Part 50 and with 10 CFR Part 50, 10 CFR 50.55a(c), 10 CFR 50.55a(d), and 10 CFR 50.55a(e) and (2) follow the provisions of Appendix G to Section III of the ASME Code. In general, the regulations cited above require the use of Section III of the ASME Code. Articles NB-2300 and NC-2300 of Section III of the ASME Code address fracture toughness requirements for Class 1 and 2, respectively. Appendix G to Section III of the ASME Code includes additional fracture toughness criteria. B. Welding The joining of the materials used to fabricate a steam generator is critical to ensuring that it can properly function. Consistent with the requirements of GDC 1 and GDC 30 (for RCPB materials), the welding qualification, weld fabrication processes, and inspection during fabrication and assembly of the steam generator are performed by using quality