Document: NUREG-0800
Document ID: 2ab6f47e-1578-451d-b6ad-29434e31a72b
Document Type: srp
Title: SYSTEM QUALITY GROUP CLASSIFICATION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340619.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.2.2
CFR Part: 
CFR Title: 

Content:
R) plants for main steam system components. These discussions have included consideration of components that are (a) not classified as safety- related items but are located downstream of the isolation valves, (b) 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 classifi- cations 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. Letter of April 19, 1974, J. M. Hendrie to J. A. Hinds. Formally BTP RSB No. 3-2 3.2.2-13 Rev. 1 - July 1981 Table B-1 CLASSIFICATION REQUIREMENTS FOR BWR/6 MAIN STEAM AND FEEDWATER SYSTEM COMPONENTS OTHER THAN THE REACTOR COOLANT PRESSURE BOUNDARY QUALITY GROUP Item SYSTEM OR COMPONENT CLASSIFICATION 1. Main Steam Line