Document: NUREG-0800
Document ID: fbf00155-ed67-4c5f-bb08-246909eb564a
Document Type: srp
Title: REACTOR COOLANT PRESSURE BOUNDARY MATERIALS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340601.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.2.3
CFR Part: 
CFR Title: 

Content:
1, GDC 30, and §50.55a: (1) The amount of specified preheat must be in accordance with the requirements of the Code, Section III, Appendix D, Paragraph D-1200, supplemented by Regulatory Guide 1.50, "Control of Preheat Temperature for Welding Low Alloy Steel." The supplemental acceptance criteria for control of preheat temperature are as follows: (a) The welding procedure qualification requires that minimum preheat and maximum interpass temperatures be specified and that the welding procedure be qualified at the minimum preheat temperature. For production welds, the preheat temperature should be maintained until a post-weld heat treatment has been performed. (b) Production welding should be monitored to verify that the limits on preheat and interpass temperatures are maintained. In the event that the above criteria are not met, the weld is subject to rejection. The preheat controls described in the Westinghouse Topical Report WCAP-8577 are an acceptable alternate to compliance with those of Regulatory Guide 1.50. (2) The acceptance criteria for electroslag welds are presented in Regulatory Guide 1.34, "Control of Electroslag Weld Properties." These criteria specify acceptable solidification patterns and impact test limits (for qualification of, welds in Class 1 and Class 2 components) and the criteria for verifying conformance during production welding. (3) Regulatory Guide 1.71, "Welder Qualification for Areas of Limited Accessibility," provides the following criteria for requalification of welders: the performance qualification should require testing of the welder when conditions of 5.2.3-7 Rev. 2 - July 1981 accessibility to a production weld are less than 30 to 35 cm (12-14 inches) in any direction from the joint; and requalifi- cation is required for different restricted accessibility conditions or when any of the essential variables listed in the Code, Section IX, are changed. Qualification of the welder or welding operators for limited accessibility may be