Document: NUREG-0800
Document ID: 22c713a3-851c-4195-8d52-e7a90bcbeed0
Document Type: srp
Title: LEAK-BEFORE-BREAK EVALUATION PROCEDURES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0636/ML063600396.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.6.3
CFR Part: 
CFR Title: 

Content:
ival material for the pipe being evaluated. If archival material is not available, plant-specific or industry-wide generic material data bases can be assembled and used to define the required material tensile and toughness properties. Test material should include base and weld metals. iv. To provide an acceptable level of reliability, plant-specific generic data bases must show reasonable lower bounds for compatible sets of material tensile and toughness properties associated with materials at the 3.6.3-8 Revision 1 - March 2007 plant. To ensure that the plant-specific generic data base is adequate, a determination must be made to demonstrate that the generic data base represents the range of plant materials to be evaluated. This determination is based on a comparison of the plant material properties identified in (subparagraph 11.1.b.) above with those of the materials used to develop the generic data base. The number of material heats and weld procedures tested must be adequate to cover the strength and toughness range of the actual plant materials. Reasonable lower bound tensile and toughness properties from the plant-specific generic data base are to be used for the stability analysis of individual materials, unless otherwise justified. Industry generic data bases must provide a reasonable lower bound for the population of material tensile and toughness properties associated with any individual specification (e.g., A106, Grade B), material type (e.g., austenitic steel) or welding procedures. If the data are being developed from an archival heat of material, three stress-strain curves and three J-resistance curves from that one heat of material is sufficient. The tests should be conducted at temperatures near the upper range of normal plant operation. Tests should also be conducted at a lower temperature, which may represent a plant condition (e.g., hot standby) where pipe break would present safety concerns similar to normal operation. These tests are intended