Document: NUREG-0800
Document ID: 9b735916-a58a-4bd3-b7e0-826b84cb6e43
Document Type: srp
Title: FRACTURE PREVENTION OF CONTAINMENT PRESSURE BOUNDARY
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070465.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.2.7
CFR Part: 
CFR Title: 

Content:
Rationale:25 The technical rationale for application of the above acceptance criteria to fracture prevention of containments is discussed in the following paragraphs: 1. GDC 1 requires that systems be designed, built, tested and maintained to appropriate quality standards to assure they will satisfactorily perform their safety functions. 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 Class 2 component criteria are used in the performance of this fracture toughness evaluation. The application of Code Class MC component criteria for the evaluation metal containment components and the specific application of Subsection NE-2000 for evaluation of steel containment materials are established staff practices reflecting that Code Class MC requirements for materials, DRAFT Rev. 1 - April 1996 6.2.7-4 design, fabrication, and testing are commensurate with the safety function of containment (see SRP Sections 3.2.2 and 3.8.2). The application of Code Class 2 criteria for materials that were not fracture toughness tested is consistent with the methodology for application of quality standards to pressure-retaining components commensurate with the importance of their safety functions as described in Regulatory Guide 1.26, "Quality Group Classifications and Standards for Water-, Steam-, and Radioactive-Waste-Containing Components of Nuclear Power Plants." The consistency is developed in that the containment system is addressed in the licensing review process as an engineered safety feature, as is, for example, the emergency core cooling system. Regulatory Guide 1.26 does not explicitly discuss or classify the containment pressure boundary, but does assign a Quality Group B classification to the emergency core cooling system. Regulatory Guide 1.26 assigns correspondence between Quality Group B components and