Document: NUREG-0800
Document ID: a3bf2117-9052-4006-845f-c499d572b9a1
Document Type: srp
Title: STEAM GENERATOR MATERIALS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0703/ML070380192.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.2.1
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CFR Title: 

Content:
ry (e.g., denting of the steam generator tubes from corrosion of a tube support or mechanical damage to the tubes from the generation of loose parts). As a result, the materials selected for the steam generator must be fabricated and tested to quality standards, as required by GDC 1. In addition, the materials selected for the RCPB must be fabricated and tested to the highest quality standards, as required by GDC 30. The materials selected for use in fabricating the steam generator are acceptable from a fabrication/manufacturing standpoint if they comply with 10 CFR 50.55a. In general, this regulation - specifically 10 CFR 50.55a(c), 10 CFR 50.55a(d), and 10 CFR 50.55a(e) - requires that the components satisfy the requirements of Section III of the ASME Code. Provisions in 10 CFR 50.55a(b) permit ASME Code cases, as discussed in Regulatory Guide 1.84, to be used to select, fabricate, and test materials for the steam generator. Section III of the ASME Code establishes - through articles such as NCA-1000, NB-2000 (for Class 1 components), and NC-2000 (for Class 2 components) - requirements for selecting, processing, testing, inspecting (during fabrication/ manufacturing), and certifying materials. In general, Section III of the ASME Code references Parts C and D of Section II of the ASME Code for permitted material specifications (e.g., in Articles NB-2120 and NC-2120). Examples of materials that are currently used for Class 1 components in the steam generator include the following: Tubing: ASME SB-163, N06690, Thermally Treated Pressure Plates: ASME SA-533, Grade B, Class 1 Pressure Forgings ASME SA-508, Grade 3, Class 2 (formerly referred (including nozzles to as Class 3a) and 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 (308L, 309L), and Welds: