Document: NUREG-0800
Document ID: 6237521d-c825-4ed6-8fb7-7b3b8019a3fc
Document Type: srp
Title: SYSTEM QUALITY GROUP CLASSIFICATION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070297.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.2.2
CFR Part: 
CFR Title: 

Content:
not specifically designed to seismic Category I standards, and (c) not housed in Seismic Category I structures. To date, BWR plant reviews have resulted in various approaches for different individual applications. While these different approaches have resulted in acceptable levels of safety in each case, they have required time-consuming case-by-case reviews. The GESSAR (PDA) BWR/6 application which was reviewed as part of our standardization program, includes this portion of the BWR plant. In the course of the GESSAR PDA review, we have identified a systematic basis for classification of such components that will result in an acceptable and uniform design basis for the main steam lines (MSL) and feedwater lines (MFL) in BWR/6 plants. B. BRANCH TECHNICAL POSITION The main steam and feedwater system components of BWR/6 plants should be classified in accordance with SRP Section 3.2.2, Appendix A, or alternately, in accordance with the attached Table B-1 of SRP Section 3.2.2. The classifications indicated are consistent with the guidelines currently specified in Regulatory Guide 1.26 and Regulatory Guide 1.29. As an additional requirement, a suitable interface restraint should be provided at the point of departure from the Class I structure where the interface exists between the safety and nonsafety-related portions of the MSL and MFL. A sketch is attached (Figure B-1) to clarify the specified alternate classification system. C. REFERENCES 1. Regulatory Guide 1.26, "Quality Group Classification and Standards for Water-, Steam-, and Radioactive-Waste-Containing Components of Nuclear Power Plants."132 2. Regulatory Guide 1.29, "Seismic Design Classification."133 DRAFT Rev. 2 - April 1996 3.2.2-20 13. Letter of April 19, 1974, J. M. Hendrie to J. A. Hinds.134 4. ANSI/ASME B31.1-1973, "Power Piping," American National Standards Institute (1973). 135 136 5. GEZ-4982A, "General Electric Large Steam Turbine - Generator Quality Control Program."137 Table B-1 CLASSIFICATION