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:
n pattern. If the combination of process variables produces a deep pool of molten weld metal, the crystal (dendritic) growth direction from the pool sides will join at an obtuse angle at the center of the weld, and cracks may develop because of the weaker centerline bond between dendrites. A proper combination of process variables promotes a dendritic growth pattern with an acute joining angle, which results in a strong centerline bond. The welding variables, solidification patterns, and macro etch tests used in the electroslag welding of austenitic stainless steel are reviewed. Experience has shown that a welder qualified to weld stainless steel components under normal fabricating conditions may not produce acceptable welds if the accessibility to the weld area is restricted. 5.2.3-4 Rev. 2 - July 1981 Limited accessibility can occur when component parts are joined in the final assembly or at the plant site, where other adjacent com- ponents or structures prevent the welder from assuming an advantageous position during the welding operation. The adequacy of accessibility of field erected structures, for welding austenitic stainless steel components, is reviewed. e. The requirements for nondestructive examination of wrought seamless tubular products used for components of nuclear power plants are specified in Paragraph NB-2550 of the Code, Section III. Nondes- tructive examination techniques applied to tubular products used for components of the RCPB, or other safety-related ASME Class 1 systems that are designed for pressure in excess of 275 psig or temperatures in excess of 2001F, must be capable of detecting unacceptable defects regardless of defect shape, orientation, or location in the product. The nondestructive examination procedures used for inspection of tubular products are reviewed. Inservice inspection requirements for the RCPB are described in SRP Section 5.2.4, "Inservice Inspection and Testing of Reactor Coolant Pressure Boundary." The review for