Document: NUREG-0800
Document ID: d8b522d4-dee5-4122-89d4-b2b45d0ca729
Document Type: srp
Title: REACTOR COOLANT PRESSURE BOUNDARY MATERIALS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070420.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.2.3
CFR Part: 
CFR Title: 

Content:
tuse 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. Limited accessibility can occur when component parts are joined in the final assembly or at the plant site, where other adjacent components 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 Paragraphs NB-2550 through NB-2570 of the Code, Section III. Nondestructive 22 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 1.896 MPa (275 psig) or temperatures in excess of 93 C 23 (200 F) , must be capable of detecting unacceptable defects regardless of defect 24 shape, orientation, or location in the product. The nondestructive examination procedures used for inspection of tubular products are reviewed. f. Where cast austenitic stainless steel components are proposed for use in the RCPB, the adequacy of material fracture toughness properties and welding controls to resist thermal aging effects over the design life are reviewed. Since welds on such materials are difficult to inspect using ultrasonic techniques, the inspectability