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:
e 3, Class 2 (including nozzles and (formerly referred to as Class 3a) tubesheet): Nozzle Safe Ends: ASME SA-182, F316LN Channel Heads: ASME SA-508, Grade 3, Class 2 (formerly referred to as Class 3a) Cladding, Buttering, ASME SFA 5.4 (308L, 309L), 5.9 and Welds: (308L, 309L), 5.11 (ENiCrFe-7), and 5.14 (ERNiCrFe-7) Pressure Boundary Welds: Low Alloy Steel, SFA 5.5, 5.23, 5.28 Manway Studs: ASME SA-193, Grade B7 Manway Nuts: ASME SA-194 5.4.2.1-7 Revision 4 - July 2016 Examples of materials that are currently used for Class 2 components in the steam generator include the following: Pressure Plates: ASME SA-533, Grade B, Class 1 Bolting: ASME SA-193, Grade B7 Tube Support Structures ASME SA-240, Type 405 and Type 410S (including anti-vibration bars/fan-bars): In summary, for the purposes of satisfying GDC 1 and GDC 30, the materials used in fabricating the steam generator are acceptable if they are selected, fabricated, tested, and inspected (during fabrication/manufacturing) in accordance with the ASME Code. 2. Steam Generator Design The design of the steam generator should limit the potential for degradation so that the integrity of the steam generator, including the tubes, is maintained during the operating interval between inspections. Some degradation mechanisms must be precluded by design since they propagate rapidly or unpredictably, while other degradation mechanisms can be effectively managed through inservice inspections. Degradation of the steam generator tubes and other secondary side components that could affect tube integrity should be manageable through the steam generator program (reviewed under SRP Section 5.4.2.2). Degradation of other steam generator RCPB and SSPB materials should be manageable through the inservice inspection program. The RCPB inservice inspection program is reviewed under SRP Section 5.2.4, while the SSPB inservice inspection program is reviewed under SRP Section 6.6, “Inservice Inspection and Testing of Class 2 and 3