Document: NUREG-0800
Document ID: 8ca256a4-9ab1-449c-8e31-66d113631927
Document Type: srp
Title: Revision 2 - March 2007
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0708/ML070800194.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3
CFR Part: 
CFR Title: 

Content:
the course of the GESSAR PDA review, the NRC staff has 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 main 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 Branch Technical Position (BTP) 3-1, or alternately, in accordance with the attached Table B-1. The classifications indicated are consistent with the guidelines currently specified in RG 1.26 and RG 1.29. As an additional criterion, 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." 2. Regulatory Guide 1.29, "Seismic Design Classification." 3. Letter of April 19, 1974, J. M. Hendrie to J. A. Hinds. 4. ANSI/ASME B31.1, "Power Piping," American National Standards Institute (1973). 5. GEZ-4982A, "General Electric Large Steam Turbine - Generator Quality Control Program." BTP 3-2-3 Revision 2 - March 2007 Table B-1 CLASSIFICATION CRITERIA FOR BWR/6 MAIN STEAM AND FEEDWATER SYSTEM COMPONENTS OTHER THAN THE REACTOR COOLANT PRESSURE BOUNDARY ITEM SYSTEM OR COMPONENT QUALITY GROUP CLASSIFICATION 1. Main Steam Line (MSL) from second isolation valve to and including shutoff valve. B 2. Branch lines of MSL between the second isolation valve and the MSL shutoff valve, from branch point at MSL to and including the first valve in the branch line. B 3. Main feedwater line (MFL) from second isolation valve and including shutoff valve. B 4. Branch lines of MFL between the second isolation