Document: NUREG-0800
Document ID: 29ea352c-081e-469e-95b8-7278f6da64ce
Document Type: srp
Title: FRACTURE PREVENTION OF CONTAINMENT PRESSURE BOUNDARY
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0636/ML063600407.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.2.7
CFR Part: 
CFR Title: 

Content:
e materials and fracture toughness data presented in NUREG-0577, “Potential for Low Fracture Toughness and Lamellar Tearing on PWR Steam Generator and Reactor Coolant Pump 6.2.7-4 Revision 1 - March 2007 Supports,” and ASME Code Section III, Summer 1977 Addenda, Subsection NC. The metallurgical characterization of these materials, with respect to their fracture toughness, is developed from a review of how these materials were fabricated and what thermal history they experienced during fabrication. The metallurgical characterization of these materials, when correlated with the data presented in NUREG-0577 and the Summer 1977 Addenda of the ASME Code Section III, provides the technical basis for the staff's evaluation of the compliance with Code Class 2 requirements of the materials which were not fracture toughness tested. Technical Rationale The technical rationale for application of these acceptance criteria to the areas of review addressed by this SRP section is discussed in the following paragraphs: 1. GDC 1 requires that structures, systems and components be designed, fabricated, erected and tested commensurate with the importance of the safety functions to be performed. This SRP section evaluates the fracture toughness of the containment pressure boundary ferritic materials to ensure they are not subject to brittle fracture. ASME Code Section III, Division 1, Class MC (Metal Containment) or Section III, Division 2, Class CC (concrete containment) or Class 2 component criteria are used in the performance of this fracture toughness evaluation. The application of Code Class MC or CC component criteria for the evaluation metal containment components and the specific application of Subsection NE-2000 for evaluation of steel containment materials or CC-2520 for concrete containment liners, are established staff practices reflecting that Code Class MC or CC requirements for materials, design, fabrication, and testing are commensurate with the safety function of