Document: NUREG-0800
Document ID: 4a46b35d-2e81-4517-9716-154b19f57049
Document Type: srp
Title: REACTOR COOLANT PRESSURE BOUNDARY MATERIALS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0631/ML063190006.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.2.3
CFR Part: 
CFR Title: 

Content:
C 31 that the probability of rapidly propagating failure of RCPB materials be extremely low, and the probability of rapidly propagating fracture of RCPB materials be minimized. The controls imposed on welding preheat temperatures for welding ferritic steels are in conformance with the recommendations of Regulatory Guide 1.50, “Control of Preheat Temperature for Welding Low Alloy Steel.” These controls provide reasonable assurance that cracking of components made from low alloy steels will not occur during fabrication and minimize the possibility of subsequent cracking due to residual stresses being retained in the weldment. These controls satisfy the quality standards requirements of GDC 1, GDC 30, and § 50.55a for these materials under the specified conditions. The controls imposed on electroslag welding of ferritic steels are in accordance with the recommendations of Regulatory Guide 1.34, “Control of Electroslag Weld Properties,” and provide assurance that welds fabricated by the process will have high integrity and will have a sufficient degree of toughness to furnish adequate safety margins during operating, testing, maintenance, and postulated accident conditions. Conformance with the recommendations of Regulatory Guide 1.34 also satisfies the quality standards requirements of GDC 1, GDC 30, and § 50.55a for these materials under the specified conditions. The controls imposed on welding ferritic steels under conditions of limited accessibility are in accordance with the recommendations of Regulatory Guide 1.71, “Welder Qualification for Areas of Limited Accessibility,” and provide assurance that proper requalification of welders will be required in accordance with the welding conditions. These controls also satisfy the quality standards requirements of GDC 1, GDC 50, and § 50.55a for welding of ferrite materials under limited accessibility. The controls imposed on weld cladding of low-alloy steel components by austenitic stainless steel are in